In article <38b01ab1@news.povray.org> , "Paul" <ran### [at] freenetcouk> 
wrote:

> 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 would suggest a requirement change from 16 bit to 24 bit color.
Browsers are not designed to be high-quality image viewers and the only
reasonable quality for an image will be available with 24 bit color. After
all a browser is not a WYSIWYG tool.
To view images on systems with less than 24 bit color, I would suggest an
image archive program, not a web browser.  However, more recent browser
versions should support dithering.


     Thorsten

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