Converter.java

package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;

public class Converter implements PlugIn {

    private ImagePlus imp;

    public void run(String arg) {
        imp = IJ.getInstance().getImagePlus();
        if (imp!=null) {
            if (imp.lock()) { //v1.24f
                convert(arg);
                imp.unlock();
            }
        } else
            IJ.noImage();
    }

    public void convert(String item) {
        int type = imp.getType();
        String msg = "Converting to " + item;
        IJ.showStatus(msg + "...");
        long start = System.currentTimeMillis();
        boolean isRoi = imp.getRoi()!=null;
        imp.killRoi();
        boolean saveChanges = imp.changes;
        imp.changes = IJ.getApplet()==null; //if not applet, set 'changes' flag
        try {
            // do single image conversions
            Undo.setup(Undo.TYPE_CONVERSION, imp);
            ImageConverter ic = new ImageConverter(imp);
            if (item.equals("8-bit"))
                ic.convertToGray8();
            else if (item.equals("16-bit"))
                ic.convertToGray16();
            else if (item.equals("32-bit"))
                ic.convertToGray32();
            else if (item.equals("RGB Color")) {
                ic.convertToRGB();
            } else if (item.equals("8-bit Color")) {
                int nColors = getNumber();
                start = System.currentTimeMillis();
                if (nColors!=0)
                    ic.convertRGBtoIndexedColor(nColors);
            } else {
                imp.changes = saveChanges;
                return;
            }
            IJ.showProgress(1.0);
            
        }
        catch (IllegalArgumentException e) {
            unsupportedConversion(imp);
            IJ.showStatus("");
            Undo.reset();
            imp.changes = saveChanges;
            Menus.updateMenus();
            return;
        }
        if (isRoi)
            imp.restoreRoi();
        IJ.showTime(imp, start, "");
        imp.repaintWindow();
        Menus.updateMenus();
    }

    void unsupportedConversion(ImagePlus imp) {
        IJ.showMessage("Converter",
            "Supported Conversions:\n" +
            " \n" +
            "8-bit -> 16-bit*\n" +
            "8-bit -> 32-bit*\n" +
            "8-bit -> RGB Color*\n" +
            "16-bit -> 8-bit*\n" +
            "16-bit -> 32-bit*\n" +
            "16-bit -> RGB Color*\n" +
            "32-bit -> 8-bit*\n" +
            "32-bit -> 16-bit\n" +
            "32-bit -> RGB Color*\n" +
            "8-bit Color -> 8-bit (grayscale)*\n" +
            "8-bit Color -> RGB Color\n" +
            "RGB Color -> 8-bit (grayscale)*\n" +
            "RGB Color -> 8-bit Color*\n" +
            "RGB Color -> RGB Stack\n" +
            "RGB Color -> HSB Stack\n" +
            "RGB Stack -> RGB Color\n" +
            "HSB Stack -> RGB Color\n" +
            " \n" +
            "* works with stacks\n"
            );
    }

    int getNumber() {
        if (imp.getType()!=ImagePlus.COLOR_RGB)
            return 256;
        GenericDialog gd = new GenericDialog("MedianCut");
        gd.addNumericField("Number of Colors (2-256):", 256, 0);
        gd.showDialog();
        if (gd.wasCanceled())
            return 0;
        int n = (int)gd.getNextNumber();
        if (n<2) n = 2;
        if (n>256) n = 256;
        return n;
    }
        
}