Good Morning All,

I'm a CF developer and I've been tasked to come up with a way to
upload images (JPG, PNG and GIF) and resize them while maintaining the
original aspect ratio for the resized image.  I was able to find and
modify some sample code that handled the resizing for JPEG's.  But, I
have to do this for the other formats as well.  Here's the sample code
snippet for JPEG's:

import com.sun.image.codec.jpeg.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;

public class Thumbnail {
.
.
.

   public myResizeMethod(String inputFile, String outputFile, int
thumbWidth, int thumbHeight, int qualitySpec) throws Exception {
   Image image = Toolkit.getDefaultToolkit().getImage(inputFile);
   MediaTracker mediaTracker = new MediaTracker(new Container());
   mediaTracker.addImage(image, 0);
   mediaTracker.waitForID(0);

   double thumbRatio = (double)thumbWidth / (double)thumbHeight;
   int imageWidth = image.getWidth(null);
   int imageHeight = image.getHeight(null);
   double imageRatio = (double)imageWidth / (double)imageHeight;
   if (thumbRatio < imageRatio) {
     thumbHeight = (int)(thumbWidth / imageRatio);
   } else {
     thumbWidth = (int)(thumbHeight * imageRatio);
   }

   // draw original image to thumbnail image object and
   // scale it to the new size on-the-fly
   BufferedImage thumbImage = new BufferedImage(thumbWidth,
thumbHeight, BufferedImage.TYPE_INT_RGB);
   Graphics2D graphics2D = thumbImage.createGraphics();
   graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,

RenderingHints.VALUE_INTERPOLATION_BICUBIC);
   graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

   // save thumbnail image to OUTFILE
   BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(outputFile));
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   JPEGEncodeParam param =
encoder.getDefaultJPEGEncodeParam(thumbImage);

   int quality = Math.max(0, Math.min(qualitySpec, 100));
   param.setQuality((float)quality / 100.0f, false);
   encoder.setJPEGEncodeParam(param);
   encoder.encode(thumbImage);
   out.close();
 }
}

Now, not knowing much about the internal workings of images, can I use
a similar algorithm for PNG's and GIF's?  I was hoping there was a
similar set of encoders/decoder classes for them.  But, I haven't been
able to find any.