After rotate, display of large JPEG images very slow.

Question

I am loading and displaying images using JAI and Java2D.
When I load a large grayscale JPEG image (300 dpi, letter size), it displays fine.
After a rotate, the next display is incredibly slow.
Source is a RenderedImage loaded from a JPEG file using:
     FileSeekableStream ss = new FileSeekableStream(file);
     ImageDecoder dec = ImageCodec.createImageDecoder("jpeg", ss, null);
     RenderedImage source = dec.decodeAsRenderedImage(curPage);
I create a scaled image using:
     interp = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
     ParameterBlock params = new ParameterBlock();
     params.addSource(source);
     params.add(xZoom); // x scale factor
     params.add(yZoom); // y scale factor
     params.add(0.0F); // x translate
     params.add(0.0F); // y translate
     params.add(interp); // interpolation method
RenderedOp image3 = JAI.create("scale", params);
And display inside the paintComponent() method of my JPanel-derived class using:
     AffineTransform transform = new AffineTransform();
     transform.translate(shiftX, shiftY);
     Graphics2D G2d = (Graphics2D)g.create(); //copy g
     G2d.drawRenderedImage(image3, transform);
If I add a rotate step after the scale:
     ParameterBlock paramsR = new ParameterBlock();
     paramsR.addSource(source);
     paramsR.add(TransposeDescriptor.ROTATE_90);
     // Create an operator to turn image.
     source = JAI.create("Transpose", paramsR, null);
Then the next display for a 300 dpi 8 bit grayscale JPEG file can take up to 60 seconds.
The bulk of the elapsed time is inside: Graphics2D.drawRenderedImage(image3, transform);
Any ideas what I am doing wrong here?
I am relatively new to using Java Advanced Imaging.
Thanks,
T.J. Brown

Answer 1

Sorry, a correction.
The file is actually JPEG-compressed data inside a TIFF file.
So the decode step uses:
ImageDecoder dec = ImageCodec.createImageDecoder("tiff", ss, null);
JPEG inside a JFIF file is much faster.
Thanks,
T.J. Brown