ClassicGlow.java

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import ij.plugin.*;
import ij.process.*;
import ij.gui.*;
import ij.*;

import java.awt.image.*;


///Plugin implementing the classic glow/hot
///LUT which seems to be missing from ImageJ
///@ingroup gPlugin
public class ClassicGlow implements PlugIn
{
    static byte red[];
    static byte green[];
    static byte blue[];

    static{
        red = new byte[256];
        green = new byte[256];
        blue = new byte[256];
        
        for(int i=0; i < 256; i++)
        {
            if(i < 85)
                red[i] = (byte)((i*3) & 0xff);
            else
                red[i] = (byte)(255 & 0xff);

            if(i < 85)  
                green[i] = 0;
            else if(i -85 < 85)
                green[i] = (byte)(((i-85)*3) & 0xff);
            else
                green[i] = (byte)(255 & 0xff);

            if(i < 170)
                blue[i] = 0;
            else
                blue[i] = (byte)(((i-170)*3) & 0xff);
        }
    }


    public void run(String arg)
    {
        ImagePlus imp = WindowManager.getCurrentImage();

        //If the image exists, it must be of the correct type, otherwise, make a ramp.
        if (imp!=null)
        {
            if (imp.getType()==ImagePlus.COLOR_RGB)
            {
                IJ.error("Color tables cannot be assiged to RGB Images.");
                return;
            }
        }
        else
        {
            //Create a ramp
            ByteProcessor r = new ByteProcessor(256, 32);

            for(int y=0; y < 32; y++)
                for(int x=0; x < 256; x++)
                    r.set(x, y, x);

            imp = new ImagePlus("Glow", r);
            imp.show();
        }


        ImageProcessor ip = imp.getProcessor();
        ColorModel cm = new IndexColorModel(8, 256, red, green, blue);
        ip.setColorModel(cm);
        if (imp.getStackSize()>1) 
            imp.getStack().setColorModel(cm);
        imp.updateAndDraw();
    }
}