package ij.plugin.frame;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import ij.*;
import ij.plugin.*;
import ij.process.*;
import ij.gui.*;
import ij.measure.*;

/** This plugin implements the Brightness/Contrast, Window/level and
	Color Balance commands, all in the Image/Adjust sub-menu. It
	allows the user to interactively adjust the brightness  and
	contrast of the active image. It is multi-threaded to
	provide a more  responsive user interface. */
public class ContrastAdjuster extends PlugInDialog implements Runnable,
	ActionListener, AdjustmentListener, ItemListener {

	public static final String LOC_KEY = "b&c.loc";
	public static final String[] sixteenBitRanges = {"Automatic", "8-bit (0-255)", "10-bit (0-1023)",
		"12-bit (0-4095)", "14-bit (0-16383)", "15-bit (0-32767)", "16-bit (0-65535)"};
	static final int AUTO_THRESHOLD = 5000;
	static final String[] channelLabels = {"Red", "Green", "Blue", "Cyan", "Magenta", "Yellow", "All"};
	static final String[] altChannelLabels = {"Channel 1", "Channel 2", "Channel 3", "Channel 4", "Channel 5", "Channel 6", "All"};
	static final String[] greyChannelLabels = {"LUT level"};
	static final int[] channelConstants = {4, 2, 1, 3, 5, 6, 7};

	ContrastPlot plot = new ContrastPlot();
	Thread thread;
	private static ContrastAdjuster instance;

	int minSliderValue=-1, maxSliderValue=-1, brightnessValue=-1, contrastValue=-1;
	int sliderRange = 256;
	boolean doAutoAdjust,doReset,doSet,doApplyLut;

	Panel panel, tPanel;
	Button autoB, resetB, setB, applyB;
	int previousImageID;
	int previousType;
	int previousSlice = 1;
	ImageJ ij;
	double min, max;
	double previousMin, previousMax;
	double defaultMin, defaultMax;
	int contrast, brightness;
	boolean RGBImage;
	Scrollbar minSlider, maxSlider, contrastSlider, brightnessSlider;
	Label minLabel, maxLabel, windowLabel, levelLabel;
	boolean done;
	int autoThreshold;
	GridBagLayout gridbag;
	GridBagConstraints c;
	int y = 0;
	boolean windowLevel, balance;
	Font monoFont = new Font("Monospaced", Font.PLAIN, 11);
	Font sanFont = IJ.font12;
	int channels = 7; // RGB
	Choice choice;
	Checkbox logHistCheckbox;
	boolean isLogHist = false;
	private String blankLabel8 = "--------";
	private String blankLabel12 = "------------";
	private double scale = Prefs.getGuiScale();
	private int digits;

	public ContrastAdjuster() {
		super("B&C");
	}

	public void run(String arg) {
		windowLevel = arg.equals("wl");
		balance = arg.equals("balance");
		if (windowLevel)
			setTitle("W&L");
		else if (balance) {
			setTitle("Color");
			channels = 4;
		}

		if (instance!=null) {
			if (!instance.getTitle().equals(getTitle())) {
				ContrastAdjuster ca = instance;
				Prefs.saveLocation(LOC_KEY, ca.getLocation());
				ca.close();
			} else {
				instance.toFront();
				return;
			}
		}
		instance = this;
		IJ.register(ContrastAdjuster.class);
		WindowManager.addWindow(this);

		ij = IJ.getInstance();
		gridbag = new GridBagLayout();
		c = new GridBagConstraints();
		setLayout(gridbag);
		if (scale>1.0) {
			sanFont = sanFont.deriveFont((float)(sanFont.getSize()*scale));
			monoFont = monoFont.deriveFont((float)(monoFont.getSize()*scale));
		}

		// plot
		c.gridx = 0;
		y = 0;
		c.gridy = y++;
		c.fill = GridBagConstraints.BOTH;
		c.anchor = GridBagConstraints.CENTER;
		c.insets = new Insets(10, 10, 0, 10);
		gridbag.setConstraints(plot, c);
		add(plot);
		plot.addKeyListener(ij);
		// min and max labels

		if (!windowLevel) {
			panel = new Panel();
			c.gridy = y++;
			c.insets = new Insets(0, 10, 0, 10);
			gridbag.setConstraints(panel, c);
			panel.setLayout(new BorderLayout());
			minLabel = new Label(blankLabel8, Label.LEFT);
			minLabel.setFont(monoFont);
			if (IJ.debugMode) minLabel.setBackground(Color.yellow);
			panel.add("West", minLabel);
			maxLabel = new Label(blankLabel8, Label.RIGHT);
			maxLabel.setFont(monoFont);
			if (IJ.debugMode) maxLabel.setBackground(Color.yellow);
			panel.add("East", maxLabel);
			add(panel);
			blankLabel8 = "        ";
		}

		// log histogram scale checkbox
		logHistCheckbox = new Checkbox("Log scale");
		logHistCheckbox.setState(isLogHist);
		logHistCheckbox.addItemListener(this);
		c.gridy = y++;
		gridbag.setConstraints(logHistCheckbox, c);
		add(logHistCheckbox);

		// min slider
		if (!windowLevel) {
			minSlider = new Scrollbar(Scrollbar.HORIZONTAL, sliderRange/2, 1, 0, sliderRange);
			GUI.fixScrollbar(minSlider);
			c.gridy = y++;
			c.insets = new Insets(2, 10, 0, 10);
			gridbag.setConstraints(minSlider, c);
			add(minSlider);
			minSlider.addAdjustmentListener(this);
			minSlider.addKeyListener(ij);
			minSlider.setUnitIncrement(1);
			minSlider.setFocusable(false); // prevents blinking on Windows
			addLabel("Minimum", null);
		}

		// max slider
		if (!windowLevel) {
			maxSlider = new Scrollbar(Scrollbar.HORIZONTAL, sliderRange/2, 1, 0, sliderRange);
			GUI.fixScrollbar(maxSlider);
			c.gridy = y++;
			c.insets = new Insets(2, 10, 0, 10);
			gridbag.setConstraints(maxSlider, c);
			add(maxSlider);
			maxSlider.addAdjustmentListener(this);
			maxSlider.addKeyListener(ij);
			maxSlider.setUnitIncrement(1);
			maxSlider.setFocusable(false);
			addLabel("Maximum", null);
		}

		// brightness slider
		brightnessSlider = new Scrollbar(Scrollbar.HORIZONTAL, sliderRange/2, 1, 0, sliderRange);
		GUI.fixScrollbar(brightnessSlider);
		c.gridy = y++;
		c.insets = new Insets(windowLevel?12:2, 10, 0, 10);
		gridbag.setConstraints(brightnessSlider, c);
		add(brightnessSlider);
		brightnessSlider.addAdjustmentListener(this);
		brightnessSlider.addKeyListener(ij);
		brightnessSlider.setUnitIncrement(1);
		brightnessSlider.setFocusable(false);
		if (windowLevel)
			addLabel("Level: ", levelLabel=new TrimmedLabel(blankLabel12));
		else
			addLabel("Brightness", null);

		// contrast slider
		if (!balance) {
			contrastSlider = new Scrollbar(Scrollbar.HORIZONTAL, sliderRange/2, 1, 0, sliderRange);
			GUI.fixScrollbar(contrastSlider);
			c.gridy = y++;
			c.insets = new Insets(2, 10, 0, 10);
			gridbag.setConstraints(contrastSlider, c);
			add(contrastSlider);
			contrastSlider.addAdjustmentListener(this);
			contrastSlider.addKeyListener(ij);
			contrastSlider.setUnitIncrement(1);
			contrastSlider.setFocusable(false);
			if (windowLevel)
				addLabel("Window: ", windowLabel=new TrimmedLabel(blankLabel12));
			else
				addLabel("Contrast", null);
		}

		// color channel popup menu
		if (balance) {
			c.gridy = y++;
			c.insets = new Insets(5, 10, 0, 10);
			choice = new Choice();
			addBalanceChoices();
			gridbag.setConstraints(choice, c);
			choice.addItemListener(this);
			add(choice);
		}

		// buttons
 		if (scale>1.0) {
			Font font = getFont();
			if (font!=null)
				font = font.deriveFont((float)(font.getSize()*scale));
			else
				font = new Font("SansSerif", Font.PLAIN, (int)(12*scale));
			setFont(font);
		}
		int trim = IJ.isMacOSX()?20:0;
		panel = new Panel();
		panel.setLayout(new GridLayout(0,2, 0, 0));
		autoB = new TrimmedButton("Auto",trim);
		autoB.addActionListener(this);
		autoB.addKeyListener(ij);
		panel.add(autoB);
		resetB = new TrimmedButton("Reset",trim);
		resetB.addActionListener(this);
		resetB.addKeyListener(ij);
		panel.add(resetB);
		setB = new TrimmedButton("Set",trim);
		setB.addActionListener(this);
		setB.addKeyListener(ij);
		panel.add(setB);
		applyB = new TrimmedButton("Apply",trim);
		applyB.addActionListener(this);
		applyB.addKeyListener(ij);
		panel.add(applyB);
		c.gridy = y++;
		c.insets = new Insets(8, 5, 10, 5);
		gridbag.setConstraints(panel, c);
		add(panel);

 		addKeyListener(ij);  // ImageJ handles keyboard shortcuts
		pack();
		Point loc = Prefs.getLocation(LOC_KEY);
		if (loc!=null)
			setLocation(loc);
		else
			GUI.centerOnImageJScreen(this);
		if (IJ.isMacOSX()) setResizable(false);
		show();

		thread = new Thread(this, "ContrastAdjuster");
		//thread.setPriority(thread.getPriority()-1);
		thread.start();
		setup();
	}

	void addBalanceChoices() {
		ImagePlus imp = WindowManager.getCurrentImage();
		if (imp!=null && imp.isComposite()) {
			for (int i=0; i<altChannelLabels.length; i++)
				choice.addItem(altChannelLabels[i]);
		} else if (imp!=null && ((imp.getType() == ImagePlus.GRAY8) || (imp.getType() == ImagePlus.GRAY16) || (imp.getType() == ImagePlus.GRAY32))) {
			for (int i=0; i<greyChannelLabels.length; i++)
				choice.addItem(greyChannelLabels[i]);
		} else {
			for (int i=0; i<channelLabels.length; i++)
				choice.addItem(channelLabels[i]);
		}
	}

	void addLabel(String text, Label label2) {
		if (label2==null&&IJ.isMacOSX()) text += "    ";
		panel = new Panel();
		c.gridy = y++;
		int bottomInset = IJ.isMacOSX()?4:0;
		c.insets = new Insets(0, 10, bottomInset, 0);
		gridbag.setConstraints(panel, c);
        panel.setLayout(new FlowLayout(label2==null?FlowLayout.CENTER:FlowLayout.LEFT, 0, 0));
		Label label= new TrimmedLabel(text);
		label.setFont(sanFont);
		panel.add(label);
		if (label2!=null) {
			label2.setFont(monoFont);
			label2.setAlignment(Label.LEFT);
			panel.add(label2);
		}
		add(panel);
	}

	void setup() {
		ImagePlus imp = WindowManager.getCurrentImage();
		if (imp!=null) {
			if (imp.getType()==ImagePlus.COLOR_RGB && imp.isLocked())
				return;
			setup(imp);
			updatePlot();
			updateLabels(imp);
			imp.updateAndDraw();
		}
	}

	public synchronized void adjustmentValueChanged(AdjustmentEvent e) {
		Object source = e.getSource();
		if (source==minSlider)
			minSliderValue = minSlider.getValue();
		else if (source==maxSlider)
			maxSliderValue = maxSlider.getValue();
		else if (source==contrastSlider)
			contrastValue = contrastSlider.getValue();
		else
			brightnessValue = brightnessSlider.getValue();
		notify();
	}

	public synchronized  void actionPerformed(ActionEvent e) {
		Button b = (Button)e.getSource();
		if (b==null) return;
		if (b==resetB)
			doReset = true;
		else if (b==autoB)
			doAutoAdjust = true;
		else if (b==setB)
			doSet = true;
		else if (b==applyB)
			doApplyLut = true;
		notify();
	}

	ImageProcessor setup(ImagePlus imp) {
		Roi roi = imp.getRoi();
		if (roi!=null) roi.endPaste();
		ImageProcessor ip = imp.getProcessor();
		int type = imp.getType();
		int slice = imp.getCurrentSlice();
		RGBImage = type==ImagePlus.COLOR_RGB;
		if (imp.getID()!=previousImageID || type!=previousType || slice!=previousSlice)
			setupNewImage(imp, ip);
		previousImageID = imp.getID();
	 	previousType = type;
	 	previousSlice = slice;
	 	return ip;
	}

	void setupNewImage(ImagePlus imp, ImageProcessor ip)  {
		Undo.reset();
		previousMin = min;
		previousMax = max;
		boolean newRGBImage = RGBImage && !((ColorProcessor)ip).caSnapshot();
	 	if (newRGBImage) {
	 		ip.snapshot();
	 		((ColorProcessor)ip).caSnapshot(true);
	 	}
		double min2 = imp.getDisplayRangeMin();
		double max2 = imp.getDisplayRangeMax();
		if (newRGBImage) {
			min2=0.0;
			max2=255.0;
		}
		int bitDepth = imp.getBitDepth();
		if (bitDepth==16 || bitDepth==32) {
			Roi roi = imp.getRoi();
			imp.deleteRoi();
			ImageStatistics stats = imp.getRawStatistics();
			defaultMin = stats.min;
			defaultMax = stats.max;
			imp.setRoi(roi);
		} else {
			defaultMin = 0;
			defaultMax = 255;
		}
		setMinAndMax(imp, min2, max2);
		min = imp.getDisplayRangeMin();
		max = imp.getDisplayRangeMax();
		plot.defaultMin = defaultMin;
		plot.defaultMax = defaultMax;
		int valueRange = (int)(defaultMax-defaultMin);
		int newSliderRange = valueRange;
		if (newSliderRange>640 && newSliderRange<1280)
			newSliderRange /= 2;
		else if (newSliderRange>=1280)
			newSliderRange /= 5;
		if (newSliderRange<256) newSliderRange = 256;
		if (newSliderRange>1024) newSliderRange = 1024;
		double displayRange = max-min;
		if (valueRange>=1280 && valueRange!=0 && displayRange/valueRange<0.25)
			newSliderRange *= 1.6666;
		if (newSliderRange!=sliderRange) {
			sliderRange = newSliderRange;
			updateScrollBars(null, true);
		} else
			updateScrollBars(null, false);
		if (balance) {
			if (imp.isComposite()) {
				int channel = imp.getChannel();
				if (channel<=4) {
					choice.removeAll();
					addBalanceChoices();
					choice.select(channel-1);
					channels = channelConstants[channel-1];
				}
				if (!choice.getItem(0).equals("Channel 1")) { // if the choice is wrong
					choice.removeAll();
					addBalanceChoices();
				}
			} else if ((imp.getType() == ImagePlus.GRAY8) || (imp.getType() == ImagePlus.GRAY16) || (imp.getType() == ImagePlus.GRAY32)) { // grey image
				if (!choice.getItem(0).equals("LUT level")) { // if the choice is wrong
					choice.removeAll();
					addBalanceChoices();
				}
			} else { // not composite
				if (!choice.getItem(0).equals("Red")) { // if the choice is wrong
					choice.removeAll();
					addBalanceChoices();
				}
			}
		}
		if (!doReset)
			plotHistogram(imp);
		autoThreshold = 0;
		if (imp.isComposite())
			IJ.setKeyUp(KeyEvent.VK_SHIFT);
	}

	void setMinAndMax(ImagePlus imp, double min, double max) {
		boolean rgb = imp.getType()==ImagePlus.COLOR_RGB;
		if (channels!=7 && rgb)
			imp.setDisplayRange(min, max, channels);
		else
			imp.setDisplayRange(min, max);
		if (rgb)
			plotHistogram(imp);
	}

	void updatePlot() {
		plot.min = min;
		plot.max = max;
		plot.repaint();
	}

	void updateLabels(ImagePlus imp) {
		double min = imp.getDisplayRangeMin();
		double max = imp.getDisplayRangeMax();;
		int type = imp.getType();
		Calibration cal = imp.getCalibration();
		boolean realValue = type==ImagePlus.GRAY32;
		if (cal.calibrated()) {
			min = cal.getCValue((int)min);
			max = cal.getCValue((int)max);
			realValue = true;
		}
		digits = realValue?4:0;
		if (realValue) {
			double s = min<0||max<0?0.1:1.0;
			double amin = Math.abs(min);
			double amax = Math.abs(max);
			if (amin>99.0*s||amax>99.0*s) digits = 3;
			if (amin>999.0*s||amax>999.0*s) digits = 2;
			if (amin>9999.0*s||amax>9999.0*s) digits = 1;
			if (amin>99999.0*s||amax>99999.0*s) digits = 0;
			if (amin>9999999.0*s||amax>9999999.0*s) digits = -2;
			if ((amin>0&&amin<0.001)||(amax>0&&amax<0.001)) digits = -2;
		}
		if (windowLevel) {
			double window = max-min;
			double level = min+(window)/2.0;
			windowLabel.setText(ResultsTable.d2s(window, digits));
			levelLabel.setText(ResultsTable.d2s(level, digits));
		} else {
			String minString = IJ.d2s(min, min==0.0?0:digits) + blankLabel8;
			minLabel.setText(minString.substring(0,blankLabel8.length()));
			String maxString = blankLabel8 + IJ.d2s(max, digits);
			maxString = maxString.substring(maxString.length()-blankLabel8.length(), maxString.length());
			maxLabel.setText(maxString);
		}
	}

	void updateScrollBars(Scrollbar sb, boolean newRange) {
		if (sb==null || sb!=contrastSlider) {
			double mid = sliderRange/2;
			double c = ((defaultMax-defaultMin)/(max-min))*mid;
			if (c>mid)
				c = sliderRange - ((max-min)/(defaultMax-defaultMin))*mid;
			contrast = (int)c;
			if (contrastSlider!=null) {
				if (newRange)
					contrastSlider.setValues(contrast, 1, 0,  sliderRange);
				else
					contrastSlider.setValue(contrast);
			}
		}
		if (sb==null || sb!=brightnessSlider) {
			double level = min + (max-min)/2.0;
			double normalizedLevel = 1.0 - (level - defaultMin)/(defaultMax-defaultMin);
			brightness = (int)(normalizedLevel*sliderRange);
			if (newRange)
				brightnessSlider.setValues(brightness, 1, 0,  sliderRange);
			else
				brightnessSlider.setValue(brightness);
		}
		if (minSlider!=null && (sb==null || sb!=minSlider)) {
			if (newRange)
				minSlider.setValues(scaleDown(min), 1, 0,  sliderRange);
			else
				minSlider.setValue(scaleDown(min));
		}
		if (maxSlider!=null && (sb==null || sb!=maxSlider)) {
			if (newRange)
				maxSlider.setValues(scaleDown(max), 1, 0,  sliderRange);
			else
				maxSlider.setValue(scaleDown(max));
		}
	}

	int scaleDown(double v) {
		if (v<defaultMin) v = defaultMin;
		if (v>defaultMax) v = defaultMax;
		return (int)((v-defaultMin)*(sliderRange-1.0)/(defaultMax-defaultMin));
	}

	/** Restore image outside non-rectangular roi. */
  	void doMasking(ImagePlus imp, ImageProcessor ip) {
		ImageProcessor mask = imp.getMask();
		if (mask!=null) {
			Rectangle r = ip.getRoi();
			if (mask.getWidth()!=r.width||mask.getHeight()!=r.height) {
				ip.setRoi(imp.getRoi());
				mask = ip.getMask();
			}
			ip.reset(mask);
		}
	}

	void adjustMin(ImagePlus imp, ImageProcessor ip, double minvalue) {
		resetRGB(ip);
		min = defaultMin + minvalue*(defaultMax-defaultMin)/(sliderRange-1.0);
		if (max>defaultMax)
			max = defaultMax;
		if (min>max)
			max = min;
		setMinAndMax(imp, min, max);
		if (min==max)
			setThreshold(ip);
		if (RGBImage) doMasking(imp, ip);
		updateScrollBars(minSlider, false);
	}

	void adjustMax(ImagePlus imp, ImageProcessor ip, double maxvalue) {
		resetRGB(ip);
		max = defaultMin + maxvalue*(defaultMax-defaultMin)/(sliderRange-1.0);
		//IJ.log("adjustMax: "+maxvalue+"  "+max);
		if (min<defaultMin)
			min = defaultMin;
		if (max<min)
			min = max;
		setMinAndMax(imp, min, max);
		if (min==max)
			setThreshold(ip);
		if (RGBImage) doMasking(imp, ip);
		updateScrollBars(maxSlider, false);
	}
	
	private void resetRGB(ImageProcessor ip) {
		if (!(ip instanceof ColorProcessor))
			return;
		if (ip.getMin()==0 && ip.getMax()==255 && !((ColorProcessor)ip).caSnapshot()) {
	 		ip.snapshot();
	 		((ColorProcessor)ip).caSnapshot(true);
		}
	}

	void adjustBrightness(ImagePlus imp, ImageProcessor ip, double bvalue) {
		double center = defaultMin + (defaultMax-defaultMin)*((sliderRange-bvalue)/sliderRange);
		double width = max-min;
		min = center - width/2.0;
		max = center + width/2.0;
		setMinAndMax(imp, min, max);
		if (min==max)
			setThreshold(ip);
		if (RGBImage) doMasking(imp, ip);
		updateScrollBars(brightnessSlider, false);
	}

	void adjustContrast(ImagePlus imp, ImageProcessor ip, int cvalue) {
		double slope;
		double center = min + (max-min)/2.0;
		double range = defaultMax-defaultMin;
		double mid = sliderRange/2;
		if (cvalue<=mid)
			slope = cvalue/mid;
		else
			slope = mid/(sliderRange-cvalue);
		if (slope>0.0) {
			min = center-(0.5*range)/slope;
			max = center+(0.5*range)/slope;
		}
		setMinAndMax(imp, min, max);
		if (RGBImage) doMasking(imp, ip);
		updateScrollBars(contrastSlider, false);
	}

	void reset(ImagePlus imp, ImageProcessor ip) {
 		if (RGBImage)
			ip.reset();
		int bitDepth = imp.getBitDepth();
		if (bitDepth==16 || bitDepth==32) {
			imp.resetDisplayRange();
			defaultMin = imp.getDisplayRangeMin();
			defaultMax = imp.getDisplayRangeMax();
			plot.defaultMin = defaultMin;
			plot.defaultMax = defaultMax;
		}
		min = defaultMin;
		max = defaultMax;
		setMinAndMax(imp, min, max);
		updateScrollBars(null, false);
		plotHistogram(imp);
		autoThreshold = 0;
	}

	void plotHistogram(ImagePlus imp) {
		ImageStatistics stats;
		if (balance && (channels==4 || channels==2 || channels==1) && imp.getType()==ImagePlus.COLOR_RGB) {
			setTitle("Color");
			int w = imp.getWidth();
			int h = imp.getHeight();
			byte[] r = new byte[w*h];
			byte[] g = new byte[w*h];
			byte[] b = new byte[w*h];
			((ColorProcessor)imp.getProcessor()).getRGB(r,g,b);
			byte[] pixels=null;
			if (channels==4)
				pixels = r;
			else if (channels==2)
				pixels = g;
			else if (channels==1)
				pixels = b;
			ImageProcessor ip = new ByteProcessor(w, h, pixels, null);
			stats = ImageStatistics.getStatistics(ip, 0, imp.getCalibration());
		} else {
				if (balance) {setTitle("Color");}
				if (balance && ((imp.getType() == ImagePlus.GRAY8) || (imp.getType() == ImagePlus.GRAY16) || (imp.getType() == ImagePlus.GRAY32)) && !imp.isComposite()) { // image is grey
					setTitle("LUT Color");
				}
			int range = imp.getType()==ImagePlus.GRAY16?ImagePlus.getDefault16bitRange():0;
			if (range!=0 && imp.getProcessor().getMax()==Math.pow(2,range)-1 && !(imp.getCalibration().isSigned16Bit())) {
				ImagePlus imp2 = new ImagePlus("Temp", imp.getProcessor());
				stats = new StackStatistics(imp2, 256, 0, Math.pow(2,range));
			} else
				stats = imp.getStatistics();
		}
		// Default histogram color for images without LUT is now defined in the setHistogram method
		plot.setHistogram(stats, isLogHist);
	}

	void apply(ImagePlus imp, ImageProcessor ip) {
		if (balance && imp.isComposite())
			return;
		int bitDepth = imp.getBitDepth();
		if ((bitDepth==8||bitDepth==16) && !IJ.isMacro()) {
			String msg = "WARNING: the pixel values will\nchange if you click \"OK\".";
			if (!IJ.showMessageWithCancel("Apply Lookup Table?", msg))
				return;
		}
		String option = null;
		if (RGBImage)
			imp.unlock();
		if (!imp.lock())
			return;
		if (RGBImage) {
			if (imp.getStackSize()>1)
				applyRGBStack(imp);
			else
				applyRGB(imp,ip);
			return;
		}
		if (bitDepth==32) {
			IJ.beep();
			IJ.error("\"Apply\" does not work with 32-bit images");
			imp.unlock();
			return;
		}
		int range = 256;
		if (bitDepth==16) {
			range = 65536;
			int defaultRange = imp.getDefault16bitRange();
			if (defaultRange>0)
				range = (int)Math.pow(2,defaultRange)-1;
		}
		int tableSize = bitDepth==16?65536:256;
		int[] table = new int[tableSize];
		int min = (int)imp.getDisplayRangeMin();
		int max = (int)imp.getDisplayRangeMax();
		if (IJ.debugMode) IJ.log("Apply: mapping "+min+"-"+max+" to 0-"+(range-1));
		for (int i=0; i<tableSize; i++) {
			if (i<=min)
				table[i] = 0;
			else if (i>=max)
				table[i] = range-1;
			else
				table[i] = (int)(((double)(i-min)/(max-min))*range);
		}
		ip.setRoi(imp.getRoi());
		if (imp.getStackSize()>1 && !imp.isComposite()) {
			ImageStack stack = imp.getStack();
			YesNoCancelDialog d = new YesNoCancelDialog(new Frame(),
				"Entire Stack?", "Apply LUT to all "+stack.size()+" stack slices?");
			if (d.cancelPressed())
				{imp.unlock(); return;}
			if (d.yesPressed()) {
				if (imp.getStack().isVirtual()) {
					imp.unlock();
					IJ.error("\"Apply\" does not work with virtual stacks. Use\nImage>Duplicate to convert to a normal stack.");
					return;
				}
				int current = imp.getCurrentSlice();
				ImageProcessor mask = imp.getMask();
				for (int i=1; i<=imp.getStackSize(); i++) {
					imp.setSlice(i);
					ip = imp.getProcessor();
					if (mask!=null) ip.snapshot();
					ip.applyTable(table);
					ip.reset(mask);
				}
				imp.setSlice(current);
				option = "stack";
			} else {
				ip.snapshot();
				ip.applyTable(table);
				ip.reset(ip.getMask());
				option = "slice";
			}
		} else {
			ip.snapshot();
			ip.applyTable(table);
			ip.reset(ip.getMask());
		}
		reset(imp, ip);
		imp.changes = true;
		imp.unlock();
		if (IJ.recording()) {
			if (Recorder.scriptMode()) {
				if (option==null) option = "";
				Recorder.recordCall("IJ.run(imp, \"Apply LUT\", \""+option+"\");");
			} else {
				if (option!=null)
					Recorder.record("run", "Apply LUT", option);
				else
					Recorder.record("run", "Apply LUT");
			}
		}
	}

	void applyRGB(ImagePlus imp, ImageProcessor ip) {
		recordSetMinAndMax(ip.getMin(), ip.getMax());
		ip.snapshot();
		ip.setMinAndMax(0, 255);
		reset(imp, ip);
		/*
		double min = imp.getDisplayRangeMin();
		double max = imp.getDisplayRangeMax();
 		ip.setRoi(imp.getRoi());
 		ip.reset();
		if (channels!=7)
			((ColorProcessor)ip).setMinAndMax(min, max, channels);
		else
			ip.setMinAndMax(min, max);
		ip.reset(ip.getMask());
		imp.changes = true;
		previousImageID = 0;
	 	((ColorProcessor)ip).caSnapshot(false);
		setup();
		if (IJ.recording()) {
			if (Recorder.scriptMode())
				Recorder.recordCall("IJ.run(imp, \"Apply LUT\", \"\");");
			else
				Recorder.record("run", "Apply LUT");
		}
		*/
	}

	private void applyRGBStack(ImagePlus imp) {
		double min = imp.getDisplayRangeMin();
		double max = imp.getDisplayRangeMax();
		if (IJ.debugMode) IJ.log("applyRGBStack: "+min+"-"+max);
		int current = imp.getCurrentSlice();
		int n = imp.getStackSize();
		if (!IJ.showMessageWithCancel("Update Entire Stack?",
		"Apply brightness and contrast settings\n"+
		"to all "+n+" slices in the stack?\n \n"+
		"NOTE: There is no Undo for this operation."))
			return;
 		ImageProcessor mask = imp.getMask();
 		Rectangle roi = imp.getRoi()!=null?imp.getRoi().getBounds():null;
 		ImageStack stack = imp.getStack();
		for (int i=1; i<=n; i++) {
			IJ.showProgress(i, n);
			IJ.showStatus(i+"/"+n);
			if (i!=current) {
				ImageProcessor ip = stack.getProcessor(i);
				ip.setRoi(roi);
				if (mask!=null) ip.snapshot();
				if (channels!=7)
					((ColorProcessor)ip).setMinAndMax(min, max, channels);
				else
					ip.setMinAndMax(min, max);
				if (mask!=null) ip.reset(mask);
			}
		}
		imp.setStack(null, stack);
		imp.setSlice(current);
		imp.changes = true;
		previousImageID = 0;
		setup();
		if (IJ.recording()) {
			if (Recorder.scriptMode())
				Recorder.recordCall("IJ.run(imp, \"Apply LUT\", \"stack\");");
			else
				Recorder.record("run", "Apply LUT", "stack");
		}
	}

	void setThreshold(ImageProcessor ip) {
		if (!(ip instanceof ByteProcessor))
			return;
		if (((ByteProcessor)ip).isInvertedLut())
			ip.setThreshold(max, 255, ImageProcessor.NO_LUT_UPDATE);
		else
			ip.setThreshold(0, max, ImageProcessor.NO_LUT_UPDATE);
	}

	void autoAdjust(ImagePlus imp, ImageProcessor ip) {
 		if (RGBImage)
			ip.reset();
		ImageStatistics stats = imp.getRawStatistics();
		int limit = stats.pixelCount/10;
		int[] histogram = stats.histogram;
		if (autoThreshold<10)
			autoThreshold = AUTO_THRESHOLD;
		else
			autoThreshold /= 2;
		int threshold = stats.pixelCount/autoThreshold;
		int i = -1;
		boolean found = false;
		int count;
		do {
			i++;
			count = histogram[i];
			if (count>limit) count = 0;
			found = count>threshold;
		} while (!found && i<255);
		int hmin = i;
		i = 256;
		do {
			i--;
			count = histogram[i];
			if (count>limit) count = 0;
			found = count > threshold;
		} while (!found && i>0);
		int hmax = i;
		Roi roi = imp.getRoi();
		if (hmax>=hmin) {
			if (RGBImage) imp.deleteRoi();
			min = stats.histMin+hmin*stats.binSize;
			max = stats.histMin+hmax*stats.binSize;
			if (min==max)
				{min=stats.min; max=stats.max;}
			setMinAndMax(imp, min, max);
			if (RGBImage && roi!=null) imp.setRoi(roi);
		} else {
			reset(imp, ip);
			return;
		}
		updateScrollBars(null, false);
		if (IJ.recording()) {
			if (Recorder.scriptMode())
				Recorder.recordCall("IJ.run(imp, \"Enhance Contrast\", \"saturated=0.35\");");
			else
				Recorder.record("run", "Enhance Contrast", "saturated=0.35");
		}
	}
	
	void setMinAndMax(ImagePlus imp, ImageProcessor ip) {
		min = imp.getDisplayRangeMin();
		max = imp.getDisplayRangeMax();
		Calibration cal = imp.getCalibration();
		double minValue = cal.getCValue(min);
		double maxValue = cal.getCValue(max);
		int channels = imp.getNChannels();
		GenericDialog gd = new GenericDialog("Set Display Range");
		gd.addNumericField("Minimum displayed value: ", minValue, digits, 9, "");
		gd.addNumericField("Maximum displayed value: ", maxValue, digits, 9, "");
		gd.addChoice("Unsigned 16-bit range:", sixteenBitRanges, sixteenBitRanges[get16bitRangeIndex()]);
		String label = "Propagate to all other ";
		label = imp.isComposite()?label+channels+" channel images":label+"open images";
		gd.addCheckbox(label, false);
		boolean allChannels = false;
		if (imp.isComposite() && channels>1) {
			label = "Propagate to the other ";
			label = channels==2?label+"channel of this image":label+(channels-1)+" channels of this image";
			gd.addCheckbox(label, allChannels);
		}
		gd.showDialog();
		if (gd.wasCanceled())
			return;
		minValue = gd.getNextNumber();
		maxValue = gd.getNextNumber();
		minValue = cal.getRawValue(minValue);
		maxValue = cal.getRawValue(maxValue);
		int rangeIndex = gd.getNextChoiceIndex();
		int range1 = ImagePlus.getDefault16bitRange();
		int range2 = set16bitRange(rangeIndex);
		if (range1!=range2 && imp.getType()==ImagePlus.GRAY16 && !cal.isSigned16Bit()) {
			reset(imp, ip);
			minValue = imp.getDisplayRangeMin();
			maxValue = imp.getDisplayRangeMax();
		}
		boolean propagate = gd.getNextBoolean();
		if (imp.isComposite() && channels>1)
			allChannels = gd.getNextBoolean();
		if (maxValue>=minValue) {
			min = minValue;
			max = maxValue;
			setMinAndMax(imp, min, max);
			updateScrollBars(null, false);
			if (RGBImage) doMasking(imp, ip);
			if (allChannels) {
				int channel = imp.getChannel();
				for (int c=1; c<=channels; c++) {
					imp.setPositionWithoutUpdate(c, imp.getSlice(), imp.getFrame());
					imp.setDisplayRange(min, max);
					//IJ.log("setDisplayRange: "+c+" "+min+" "+max);
				}
				((CompositeImage)imp).reset();
				imp.setPosition(channel, imp.getSlice(), imp.getFrame());
			}
			if (propagate)
				propagate(imp);
			if (IJ.recording()) {
				if (imp.getBitDepth()==32)
					recordSetMinAndMax(min, max);
				else {
					int imin = (int)min;
					int imax = (int)max;
					if (cal.isSigned16Bit()) {
						imin = (int)cal.getCValue(imin);
						imax = (int)cal.getCValue(imax);
					}
					recordSetMinAndMax(imin, imax);
				}
				if (range2>0) {
					if (Recorder.scriptMode())
						Recorder.recordCall("ImagePlus.setDefault16bitRange("+range2+");");
					else
						Recorder.recordString("call(\"ij.ImagePlus.setDefault16bitRange\", "+range2+");\n");
				}
			}
		}
	}

	private void propagate(ImagePlus img) {
		if (img.getBitDepth()==24) {
			GenericDialog gd = new GenericDialog("Contrast Adjuster");
			gd.addMessage( "Propagation of RGB images not supported. As a work-around,\nconvert images to multi-channel composite color.");
			gd.hideCancelButton();
			gd.showDialog();
			return;
		}
		int[] list = WindowManager.getIDList();
		if (list==null) return;
		int nImages = list.length;
		if (nImages<=1) return;
		ImageProcessor ip = img.getProcessor();
		double min = ip.getMin();
		double max = ip.getMax();
		int depth = img.getBitDepth();
		if (depth==24) return;
		int id = img.getID();
		if (img.isComposite()) {
			int nChannels = img.getNChannels();
			for (int i=0; i<nImages; i++) {
				ImagePlus img2 = WindowManager.getImage(list[i]);
				if (img2==null) continue;
				int nChannels2 = img2.getNChannels();
				if (img2.isComposite() && img2.getBitDepth()==depth && img2.getID()!=id
				&& img2.getNChannels()==nChannels && img2.getWindow()!=null) {
					int channel = img2.getChannel();
					for (int c=1; c<=nChannels; c++) {
						LUT  lut = ((CompositeImage)img).getChannelLut(c);
						img2.setPosition(c, img2.getSlice(), img2.getFrame());
						img2.setDisplayRange(lut.min, lut.max);
						img2.updateAndDraw();
					}
					img2.setPosition(channel, img2.getSlice(), img2.getFrame());
				}
			}
		} else {
			for (int i=0; i<nImages; i++) {
				ImagePlus img2 = WindowManager.getImage(list[i]);
				if (img2!=null && img2.getBitDepth()==depth && img2.getID()!=id
				&& img2.getNChannels()==1 && img2.getWindow()!=null) {
					ImageProcessor ip2 = img2.getProcessor();
					ip2.setMinAndMax(min, max);
					img2.updateAndDraw();
				}
			}
		}
    }

	public static int get16bitRangeIndex() {
		int range = ImagePlus.getDefault16bitRange();
		int index = 0;
		if (range==8) index = 1;
		else if (range==10) index = 2;
		else if (range==12) index = 3;
		else if (range==14) index = 4;
		else if (range==15) index = 5;
		else if (range==16) index = 6;
		return index;
	}

	public static int set16bitRange(int index) {
		int range = 0;
		if (index==1) range = 8;
		else if (index==2) range = 10;
		else if (index==3) range = 12;
		else if (index==4) range = 14;
		else if (index==5) range = 15;
		else if (index==6) range = 16;
		ImagePlus.setDefault16bitRange(range);
		return range;
	}

	public static String[] getSixteenBitRanges() {
		return sixteenBitRanges;
	}

	void setWindowLevel(ImagePlus imp, ImageProcessor ip) {
		min = imp.getDisplayRangeMin();
		max = imp.getDisplayRangeMax();
		Calibration cal = imp.getCalibration();
		double minValue = cal.getCValue(min);
		double maxValue = cal.getCValue(max);
		//IJ.log("setWindowLevel: "+min+" "+max);
		double windowValue = maxValue - minValue;
		double levelValue = minValue + windowValue/2.0;
		GenericDialog gd = new GenericDialog("Set W&L");
		gd.addNumericField("Window Center (Level): ", levelValue, digits, 9, "");
		gd.addNumericField("Window Width: ", windowValue, digits, 9, "");
		gd.addCheckbox("Propagate to all open images", false);
		gd.showDialog();
		if (gd.wasCanceled())
			return;
		levelValue = gd.getNextNumber();
		windowValue = gd.getNextNumber();
		minValue = levelValue-(windowValue/2.0);
		maxValue = levelValue+(windowValue/2.0);
		minValue = cal.getRawValue(minValue);
		maxValue = cal.getRawValue(maxValue);
		boolean propagate = gd.getNextBoolean();
		if (maxValue>=minValue) {
			min = minValue;
			max = maxValue;
			setMinAndMax(imp, minValue, maxValue);
			updateScrollBars(null, false);
			if (RGBImage) doMasking(imp, ip);
			if (propagate)
				propagate(imp);
			if (IJ.recording()) {
				if (imp.getBitDepth()==32)
					recordSetMinAndMax(min, max);
				else {
					int imin = (int)min;
					int imax = (int)max;
					if (cal.isSigned16Bit()) {
						imin = (int)cal.getCValue(imin);
						imax = (int)cal.getCValue(imax);
					}
					recordSetMinAndMax(imin, imax);
				}
			}
		}
	}

	public static void recordSetMinAndMax(double min, double max) {
		if ((int)min==min && (int)max==max) {
			int imin=(int)min, imax = (int)max;
			if (Recorder.scriptMode()) {
				Recorder.recordCall("imp.setDisplayRange("+imin+", "+imax+");");
				Recorder.recordCall("imp.updateAndDraw();");
			} else
				Recorder.record("setMinAndMax", imin, imax);
		} else {
			if (Recorder.scriptMode()) {
				Recorder.recordCall("imp.setDisplayRange("+ResultsTable.d2s(min,2)+", "+ResultsTable.d2s(max,2)+");");
				Recorder.recordCall("imp.updateAndDraw();");
			} else
				Recorder.recordString("setMinAndMax("+ResultsTable.d2s(min,2)+", "+ResultsTable.d2s(max,2)+");");
		}
	}

	static final int RESET=0, AUTO=1, SET=2, APPLY=3, THRESHOLD=4, MIN=5, MAX=6,
		BRIGHTNESS=7, CONTRAST=8, UPDATE=9;

	// Separate thread that does the potentially time-consuming processing
	public void run() {
		while (!done) {
			synchronized(this) {
				try {wait();}
				catch(InterruptedException e) {}
			}
			doUpdate();
		}
	}

	void doUpdate() {
		ImagePlus imp;
		ImageProcessor ip;
		int action;
		int minvalue = minSliderValue;
		int maxvalue = maxSliderValue;
		int bvalue = brightnessValue;
		int cvalue = contrastValue;
		if (doReset) action = RESET;
		else if (doAutoAdjust) action = AUTO;
		else if (doSet) action = SET;
		else if (doApplyLut) action = APPLY;
		else if (minSliderValue>=0) action = MIN;
		else if (maxSliderValue>=0) action = MAX;
		else if (brightnessValue>=0) action = BRIGHTNESS;
		else if (contrastValue>=0) action = CONTRAST;
		else return;
		minSliderValue = maxSliderValue = brightnessValue = contrastValue = -1;
		doReset = doAutoAdjust = doSet = doApplyLut = false;
		imp = WindowManager.getCurrentImage();
		if (imp==null) {
			IJ.beep();
			IJ.showStatus("No image");
			return;
		} else if (imp.getOverlay()!=null && imp.getOverlay().isCalibrationBar()) {
			IJ.beep();
			IJ.showStatus("Has calibration bar");
			return;
		}
		ip = imp.getProcessor();
		if (RGBImage && !imp.lock())
			{imp=null; return;}
		switch (action) {
			case RESET:
				reset(imp, ip);
				if (IJ.recording()) {
						if (Recorder.scriptMode())
							Recorder.recordCall("IJ.resetMinAndMax(imp);");
						else
							Recorder.record("resetMinAndMax");
				}
				break;
			case AUTO: autoAdjust(imp, ip); break;
			case SET: if (windowLevel) setWindowLevel(imp, ip); else setMinAndMax(imp, ip); break;
			case APPLY: apply(imp, ip); break;
			case MIN: adjustMin(imp, ip, minvalue); break;
			case MAX: adjustMax(imp, ip, maxvalue); break;
			case BRIGHTNESS: adjustBrightness(imp, ip, bvalue); break;
			case CONTRAST: adjustContrast(imp, ip, cvalue); break;
		}
		plotHistogram(imp);
		updatePlot();
		updateLabels(imp);
		if ((IJ.shiftKeyDown()||(balance&&channels==7)) && imp.isComposite())
			((CompositeImage)imp).updateAllChannelsAndDraw();
		else
			imp.updateChannelAndDraw();
		if (RGBImage)
			imp.unlock();
	}

    /** Overrides close() in PlugInDialog. */
    public void close() {
    	super.close();
		instance = null;
		done = true;
		Prefs.saveLocation(LOC_KEY, getLocation());
		synchronized(this) {
			notify();
		}
	}

	public void windowActivated(WindowEvent e) {
		super.windowActivated(e);
		Window owin = e.getOppositeWindow();
		if (owin==null || !(owin instanceof ImageWindow))
			return;
		if (IJ.debugMode) IJ.log("windowActivated: "+owin);
		if (IJ.isMacro()) {
			// do nothing if macro and RGB image
			ImagePlus imp2 = WindowManager.getCurrentImage();
			if (imp2!=null && imp2.getBitDepth()==24) {
				return;
			}
		}
		previousImageID = 0; // user may have modified image
		setup();
		WindowManager.setWindow(this);
	}
	
	public synchronized  void itemStateChanged(ItemEvent e) {
		Object source = e.getSource();
		if (source==logHistCheckbox) {
			isLogHist=logHistCheckbox.getState();
			// IJ.log("log state changed");
			ImagePlus imp = WindowManager.getCurrentImage();
			if (imp!=null) {
				// IJ.log("now updating histogram from itemStateChanged "+imp);
				plotHistogram(imp);
				updatePlot();
				updateLabels(imp);
			}
		}
		else {
			int index = choice.getSelectedIndex();
			channels = channelConstants[index];
			ImagePlus imp = WindowManager.getCurrentImage();
			if (imp!=null) {
				if (imp.isComposite()) {
					if (index+1<=imp.getNChannels())
						imp.setPosition(index+1, imp.getSlice(), imp.getFrame());
					else {
						choice.select(channelLabels.length-1);
						channels = 7;
					}
				} else {
					imp.getProcessor().snapshot();
					doReset = true;
				}
			}
		}
		notify();
	}

    /** Resets this ContrastAdjuster and brings it to the front. */
    public void updateAndDraw() {
        previousImageID = 0;
        toFront();
    }

    /** Updates the ContrastAdjuster. */
    public static void update() {
		if (instance!=null) {
			instance.previousImageID = 0;
			instance.setup();
		}
    }

} // ContrastAdjuster class


class ContrastPlot extends Canvas implements MouseListener {
	Color[] hColors;
	static final int WIDTH=128, HEIGHT=64;
	double defaultMin = 0;
	double defaultMax = 255;
	double min = 0;
	double max = 255;
	int[] histogram;
	int hmax;
	Image os;
	Graphics osg;
	Color color = Color.gray;
	double scale = Prefs.getGuiScale();
	int width = WIDTH;
	int height = HEIGHT;

	public ContrastPlot() {
		addMouseListener(this);
		width = (int)(width*1.3); // increase size
		height = (int)(height*1.3); // increase size
		if (scale>1.0) {
			width = (int)(width*scale);
			height = (int)(height*scale);
		}
		setSize(width+1, height+1);
	}

    /** Overrides Component getPreferredSize(). Added to work
    	around a bug in Java 1.4.1 on Mac OS X.*/
    public Dimension getPreferredSize() {
        return new Dimension(width+1, height+1);
    }

	void setHistogram(ImageStatistics stats, boolean isLogHist) {
		histogram = stats.histogram;
		if (isLogHist) {
			for (int j=0;j<256;j++) {
				histogram[j]=(int)(Math.log(histogram[j])*100);
			}
		}
		ImagePlus imp = WindowManager.getCurrentImage();
		hColors = new Color[256];
		for (int i=0; i<256; i++) { // set the default histogram color when there is no LUT
			hColors[i] = new Color(110, 110,150);
		}
		int impType= imp.getType();
		if ((impType == ImagePlus.GRAY8) || (impType == ImagePlus.GRAY16) || (impType == ImagePlus.GRAY32)) { //if image has LUT
			ImageProcessor ip = imp.getProcessor();
			ColorModel cm = ip.getColorModel();
			IndexColorModel icm = (IndexColorModel)cm;
			int mapSize = icm.getMapSize();
			if (mapSize!=256)
				return;
			byte[] red = new byte[256];
			byte[] green = new byte[256];
			byte[] blue = new byte[256];
			icm.getReds(red);
			icm.getGreens(green);
			icm.getBlues(blue);
			for (int i=0; i<256; i++) {
				hColors[i] = new Color(red[i]&255, green[i]&255, blue[i]&255);
			}
		}
		if (histogram.length!=256) {
			histogram=null;
			return;
		}
		int maxCount = 0;
		int mode = 0;
		for (int i=0; i<256; i++) {
			if (histogram[i]>maxCount) {
				maxCount = histogram[i];
				mode = i;
			}
		}
		int maxCount2 = 0;
		for (int i=0; i<256; i++) {
			if ((histogram[i]>maxCount2) && (i!=mode))
				maxCount2 = histogram[i];
		}
		if (isLogHist) {
			hmax =(int)(Math.log(stats.maxCount)*100);
		} else {
			hmax = stats.maxCount;
		}
		if ((hmax>(maxCount2*2)) && (maxCount2!=0)) {
			hmax = (int)(maxCount2*1.5);
			histogram[mode] = hmax;
		}

		os = null;
	}

	public void update(Graphics g) {
		paint(g);
	}

	public void paint(Graphics g) {
		int x1, y1, x2, y2,j,j1,j2;
		double colscale;
		double scale = (double)width/(defaultMax-defaultMin);
		double slope = 0.0;
		j1=(int)((min-defaultMin)/(defaultMax-defaultMin)*255);
		j2=(int)((max-defaultMin)/(defaultMax-defaultMin)*255);
		if (j2>j1) {
			colscale=255.0/(j2-j1);
		} else {
			colscale=1;
		}
		if (max!=min)
			slope = height/(max-min);
		if (min>=defaultMin) {
			x1 = (int)(scale*(min-defaultMin));
			y1 = height;
		} else {
			x1 = 0;
			if (max>min)
				y1 = height-(int)((defaultMin-min)*slope);
			else
				y1 = height;
		}
		if (max<=defaultMax) {
			x2 = (int)(scale*(max-defaultMin));
			y2 = 0;
		} else {
			x2 = width;
			if (max>min)
				y2 = height-(int)((defaultMax-min)*slope);
			else
				y2 = 0;
		}
		if (histogram!=null) {
			if (os==null && hmax!=0) {
				os = createImage(width,height);
				osg = os.getGraphics();
				osg.setColor(Color.white);
				osg.fillRect(0, 0, width, height);
				double scale2 = width/256.0;
				for (int i = 0; i < 256; i++) {
					int x =(int)(i*scale2);
					j=(int) ((i-j1)*colscale);
					if (i<j1) {j=0;};
					if (i>j2) {j=255;};
					// IJ.log("--> "+String.valueOf(j1)+" "+String.valueOf(j2)+" "+String.valueOf(i)+" "+String.valueOf(j));
					if (hColors!=null)
						osg.setColor(hColors[j]);
					int y = height - ((int)(height*histogram[i])/hmax);
					osg.drawLine(x, height, x, y);
					osg.setColor(Color.black);
					osg.fillRect(x, y, 1, 1);
					//IJ.log("--> "+String.valueOf(i)+" "+String.valueOf(x)+" "+String.valueOf(histogram[i])+" "+String.valueOf(height - ((int)(height*histogram[i])/hmax)));
				}
				osg.dispose();
			}
			if (os!=null) g.drawImage(os, 0, 0, this);
		} else {
			g.setColor(Color.white);
			g.fillRect(0, 0, width, height);
		}
		g.setColor(Color.black);
 		g.drawLine(x1, y1, x2, y2);
 		g.drawLine(x2, height-5, x2, height);
 		g.drawRect(0, 0, width, height);
     }

	public void mousePressed(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}

} // ContrastPlot class

class TrimmedLabel extends Label {
	int trim = IJ.isMacOSX()?0:6;

    public TrimmedLabel(String title) {
        super(title);
    }

    public Dimension getMinimumSize() {
        return new Dimension(super.getMinimumSize().width, super.getMinimumSize().height-trim);
    }

    public Dimension getPreferredSize() {
        return getMinimumSize();
    }

} // TrimmedLabel class



