TIFF SCALED IMAGE QUALITY

Question

HI,
I am scaling a scanned image to fit into my application screen.
But the scaled image quality is very bad.
I am using the following code to scale the image.
PlanarImage im0 = JAI.create("url", new URL (sURL));
Interpolation interp = Interpolation.getInstanceInterpolation.INTERP_BICUBIC);
ParameterBlock params = new ParameterBlock();
     params.addSource(im0);
     params.add(0.4F); // x scale factor
     params.add(0.4F); // y scale factor
     params.add(0.0F); // x translate
     params.add(0.0F); // y translate
     params.add(interp); // interpolation method
/*Create an operator to scale image1. */
JAI xx = JAI.getDefaultInstance();
Map hints = new HashMap();
hints.put(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
hints.put(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
RenderedImage image2 = xx.createNS("scale", params,new RenderingHints(hints));
ANy idea helpful,
Thanks,
Ram

Answer 1

If you need to scale down your image from a factor smaller than 0.5, do the reduction twice, using factors that when multiplied give 0.4. For example, first reduce it using 0.8 then reduce the result using 0.5.
Weird, but should work. I've heard that reducing images in JAI with factors < 0.5 yield poor results.
Rafael