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From: orcus@pro-lep.cts.com (Brian Greenstone)
Newsgroups: comp.sys.apple
Subject: Re: Apple IIgs SHR fade
Message-ID: <8905232156.AA16299@crash.cts.com>
Date: 23 May 89 15:31:00 GMT
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Network Comment: to #3818 by pnet01!crash!uunet.uu.net!microsoft!brianw

It seems like most of the suggestions for doing fades are more complicated
than they should be.  This is how I do my SHR fades:
1] Read each color value out of each palatte.
2] Break the color $0xyz into its three values x y & z
3] Decrement each value until it is 0.
4] Recombine each value back into the $0xyz format.
5] Put back into the palatte.
6] Loop until all colors have been done.
7] Loop 16 times to be sure that all colors have faded completely to black.

That's how I do it, and it works evenly and smoothly.