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Path: utzoo!watmath!sunybcs!krishnan
From: krishnan@sunybcs.UUCP (Ganapathy Krishnan)
Newsgroups: net.graphics
Subject: Lookup tables
Message-ID: <2842@sunybcs.UUCP>
Date: Fri, 14-Feb-86 15:09:26 EST
Article-I.D.: sunybcs.2842
Posted: Fri Feb 14 15:09:26 1986
Date-Received: Sat, 15-Feb-86 06:20:34 EST
Distribution: net
Organization: SUNY/Buffalo Computer Science
Lines: 25

Is there a good survey article on configuring lookup tables? We have
an Adage with a  16 bit frame buffer. 

Let me explain the problem:

The Adage can be expanded to full color mode i.e. with 24 bits of color.
Just before the lookup tables, is a luvo switch which can be configured in
one of two modes: full-color or pseudo-color. In full color the leftmost
8 bits is sent to the B lookup table, the middle 8 bits to the G lookup table
and the rightmost 8 bits to the R lookup table.
In pseudo color, 8 bits can be sent to R G and B tables simultaneously.
I have been using the Adage mostly in this mode.
Hence, with sixteen bits, one way to code the image is to have 7 bits of
intensity and 9 bits of hue. How does one generate lookup tables for this?
Any ideas and suggestions will be gratefully acknowledged.
-- 


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