How can I improve the quality of resized images ?

Hello,
I've written a program for batch resizing Jpegs which is working fairly funky however the quality of the resized images could be a bit better. Is there any way of doing a smoother resize of the images ? I'm currently using:
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(scaleX, scaleY), null);
theImage = op.filter(theImage, null);
Also I'm having trouble with some Jpegs taken with my friends digital camera. When I resize the vertical (480*640) ones the colours get all messed up while the horizontal (640*480) ones turn out fine. This only happens with Jpegs from his camera ! The colour scrambling looks very similar to what I was getting with all Jpegs when I used the below code to resize images:
AffineTransform scaler = new AffineTransform();
scaler.scale(scaleX, scaleY);
AffineTransformOp scalerOp = new AffineTransformOp(scaler, AffineTransformOp.TYPE_BILINEAR);
theImage = scalerOp.filter(theImage, null);

See bug: 4712797

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