JpegWriter.java

package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import ij.io.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.*;
import java.io.*;

public class JpegWriter implements PlugIn {

    public static final int DEFAULT_QUALITY = 75;
    private static int quality;
    
    static {setQuality(ij.Prefs.getInt(ij.Prefs.JPEG, DEFAULT_QUALITY));}

    public void run(String arg) {
        ImagePlus imp = IJ.getInstance().getImagePlus();
        if (imp==null)
     return;
        imp.startTiming();
        saveAsJpeg(imp,arg);
        IJ.showTime(imp, imp.getStartTime(), "JpegWriter: ");
    } 

    void saveAsJpeg(ImagePlus imp, OutputStream f) {
        //IJ.log("saveAsJpeg: "+path);
        int width = imp.getWidth();
        int height = imp.getHeight();
        BufferedImage   bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        try {
            Graphics g = bi.createGraphics();
            g.drawImage(imp.getImage(), 0, 0, null);
            g.dispose();            
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(f);
            JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
            param.setQuality((float)(quality/100.0), true);
            encoder.encode(bi, param);
            f.close();
        }
        catch (Exception e) {
           IJ.showMessage("Jpeg Writer", ""+e);
        }
    }

    void saveAsJpeg(ImagePlus imp, String path) {
         try { 
            FileOutputStream  f  = new FileOutputStream(path);
             saveAsJpeg(imp, f);
         } catch (Exception e) {
            IJ.showMessage("Jpeg Writer", ""+e);
         }
    }

    public byte[] getJpegContents(ImagePlus imp) {
        ByteArrayOutputStream f = new ByteArrayOutputStream();
        saveAsJpeg(imp, f);
        return f.toByteArray();
    }


    public static void setQuality(int jpegQuality) {
        quality = jpegQuality;
        if (quality<0) quality = 0;
        if (quality>100) quality = 100;
    }

    public static int getQuality() {
        return quality;
    }

}