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Re: 3d highlights on dark colors

From: Gerd Moellmann
Subject: Re: 3d highlights on dark colors
Date: Wed, 8 Nov 2000 15:56:00 +0100 (CET)
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.0.90

Miles Bader <address@hidden> writes:

> Ok, I figured out a reasonable way to do this without using any
> expensive math functions.  The attached patch uses basically the same
> parameters, but instead of adjusting the existing multiplicative factor,
> it calculates an additive factor to add to all the color components,
> using only multiplication and (one) division.
> The resulting effect is *almost* the same as the previous code; however,
> because this approach adds the same value to all color components
> (R,G,B), highlights will tend to be slightly whiter than the reference
> color.  To my eye this looks slightly *better*, as it gives them a
> slightly `specular' appearance...  [Your opinion may vary :-)]

I think it would be better to introduce two variables, say
top-shadow-contrast and bottom-shadow-contrast.  These would replace
the hard coded constants 1.2 and 0.6 that are currently used to make
lighter and darker colors.

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