I am a somewhat novice Java programmer and I am brand-new to JAI.  I am
having trouble scaling an image using JAI.  It works, but the image
comes out distorted.  Below is the function in my code that does the
scaling.  I know it is the scale function that causes the problem
because I tried skipping the scale part and just creating a RenderedOp
and then doing the JAI.create("filestore", ... and there were no
problems.  You can see some of the images I scaled with this code at:

http://www.hairstylesformal.com/749.jpg
http://www.hairstylesformal.com/771.jpg

I have put a lot of work into this app and it is practically done
except for this glitch.  Any help would be greatly appreciated.

Thanks,
Dustin

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CODE
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               public File alterImage(File imgFile)
        {
            try{
                ParameterBlock pb;
                InputStream is = new FileInputStream(imgFile);
                SeekableStream s = SeekableStream.wrapInputStream(is, true);
                RenderedOp objImage = JAI.create("stream", s);
                ((OpImage)objImage.getRendering()).setTileCache(null);

                // Determine image orientation
                if(objImage.getWidth() > objImage.getHeight()) {
                    currImgIsPortrait = false;
                } else {
                    currImgIsPortrait = true;
                }

                /*
                * If the image is too large, scale it down.
                */
                if(objImage.getWidth() > MAX_IMG_SIZE || objImage.getHeight() >
MAX_IMG_SIZE) {

                    float scale = MAX_IMG_SIZE / (float) (currImgIsPortrait ?
objImage.getHeight() : objImage.getWidth());

                    pb = new ParameterBlock();
                    pb.addSource(objImage);

                    pb.add(scale);//x scale factor
                    pb.add(scale);//y scale factor
                    pb.add(0.0F);//x translate
                    pb.add(0.0F);//y translate
                    pb.add(new InterpolationNearest());//interpolation method

                    objImage = JAI.create("scale", pb);

                }

                /*
                * Save the image as a temp file
                */
                File temp = File.createTempFile("mf_temp_img", ".jpg");

                JPEGEncodeParam encodeParam = new JPEGEncodeParam();
                encodeParam.setQuality(JPEG_QUALITY);
                encodeParam.setHorizontalSubsampling(0,1);
                encodeParam.setHorizontalSubsampling(1,1);
                encodeParam.setHorizontalSubsampling(2,1);
                encodeParam.setVerticalSubsampling(0,1);
                encodeParam.setVerticalSubsampling(1,1);
                encodeParam.setVerticalSubsampling(2,1);

                JAI.create("filestore", objImage, temp.getAbsolutePath(), "jpeg",
encodeParam);

                return temp;

            } catch(Exception e) {
                e.printStackTrace();
                return null;
            }
        }