I'm producing a CD based website for someone who has given me a number of
bmp files generated by POV-Ray 3.1 for windows. The website has to be
viewable in a minimum of 16 bit high color, at 800 x 600 resolution and be
viewable in internet explorer 3.0 from microsoft. Naturally image quality is
important but it is also important to deliver the images effectively via a
web browser interface.

The problem I have is that in order to view the images in internet explorer
3.0 (which does not support bmp or png file formats) i'm converting the
original bmp files to the jpg file format. With a low compression ratio the
loss in image quality is acceptable. However when i drop my machine's color
depth down from 32 bit true color to the required minimum of 16 bit high
color I get color banding or concentric circles on the images.

I've tried using various image manipulation techniques to reduce the color
depth without effecting the image quality too seriously, but nothing seems
to get rid of the color banding or concentric circles without completely
destroying the pictures. I've also had a play with POV-Ray (since i've been
given the original files too) but nothing i've tried (including changing the
render settings and ini files) seems to work.

I have access to a large collection of image manipulation software such as
photoshop, paintshop pro etc, but nothing there seems to work either.

Please help, it's driving me nuts!

Thanks
Paul

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