Open Tiff, rotate, resize and save as JPEG (using JAI)

Question

I 'm having a hard time getting my arms around the JAI classes to perform
this transform. I've looked at the tutorial and api, etc and did not get
very far.
I have the code to open the TIFF, and save as a JPEG. My question is how to
go from there to do the manipulations (rotate, resize)?
If anyone knows how to do this with JAI classes, please let me know.
Thanks,
Bill Pfeiffer
My code:
try
SeekableStream input = new FileSeekableStream("C:\\S1000000.TIF");
FileOutputStream output = new FileOutputStream
("C:\\S1000000.jpg");
TIFFDecodeParam TIFFparam = new TIFFDecodeParam();
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff",
input ,TIFFparam);
JPEGEncodeParam JPEGparam = new
JPEGEncodeParam();
ImageEncoder encoder = ImageCodec.createImageEncoder
("jpeg",output,JPEGparam);
RenderedImage ri = decoder.decodeAsRenderedImage();
encoder.encode(ri);
input.close();
output.close();
catch (IOException e)
e.printStackTrace();

Answer 1

For Rotation....
1) add the following function to your code.
private RenderedImage rotate(int degrees, RenderedImage src, Interpolation interpRotate) {          
                         try {               
                                   float radians = (float)(degrees * (Math.PI/180.0F));
                                   ParameterBlock pb = new ParameterBlock();
                                   pb.addSource(src);
                                   pb.add(0.0F);
                                   pb.add(0.0F);
                                   pb.add(radians);
                                   pb.add(interpRotate);
                                   src = (RenderedImage)JAI.create("rotate", pb, null);
                                   pb = new ParameterBlock();
                                   pb.addSource(src);
                                   pb.add((float)-(src.getMinX()));
                                   pb.add((float)-(src.getMinY()));
                                   pb.add(interpRotate);
                                   return (RenderedImage)JAI.create("translate", pb, null);
                         }catch (Exception e) {               
                                   return src;
2. call this function before the "encoder.encode(ri);" line in your code. I pass "new InterpolationBilinear()" for the interpolation parameter of the function.
For scaling...
1) add the following lines to your code after or before you rotate the image.
ParameterBlock pb = new ParameterBlock();
pb.addSource(ri);
pb.add(1.1F); //play with these 4 lines to make the image bigger or smaller (1.0F is actual size)
pb.add(1.1F);
pb.add(0.0F);               
pb.add(0.0F);               
pb.add(new InterpolationNearest() );
t = (RenderedImage) JAI.create("scale",pb,null);
hope this helps. Just play with it a bit. You'll get it.