how to convert 32 bits color to 256 color

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From: 宋仕仁 (descent@mail.cnct.com.tw)
Date: Thu 18 Jul 2002 - 04:45:54 IDT

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If I use 16M color mode.
How I convert 16M color to 256 color.
I know use gl_getpixelrgb serial function to get rgc color.
Then I don't how to do.
Convert 16M color to 256 gray I average rgb color (ex : gray = (r+g+b)/3 ).
Is it a right method?


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