From:	Thomas Knudsen <tk AT geb DOT gfy DOT ku DOT dk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: GRX20: Changing Pallette
Date:	Fri, 30 May 1997 09:17:37 +0200
Organization:	News Server at UNI-C, Danish Computing Centre for Research and Education.
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To:	djgpp AT delorie DOT com
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On Thu, 29 May 1997, Regis BOSSUT wrote:
> Thomas Knudsen wrote:
> 
> > When using GRX20 in 256 color mode to display a pseudo-colored bitmap
> > image, I start by loading a pallette like this:
> 
> >   for(i=0; i<256; i++) GrSetColor(i, r[i], g[i], b[i]);
> 
> > then I display the image on the screen. However, if I later try to change
> > the pallette (to enable some interactive contrast stretching), nothing
> > happens.
> 
> Isn't there a GrRefreshColors() subroutine available for that purpose ?
> I don't have the source code here but it should be the answer...
> 

Unfortunately not: GrRefreshColors will reload the original pallette, and
is intended for use in a "restore" process after direct register
manipulation.

--
Thomas Knudsen                         | www:  http://www.gfy.ku.dk/~tk/
National Survey and Cadastre - Denmark | e-mail:            tk AT gfy DOT ku DOT dk
Geodetic office, Rentemestervej 8      | Direct Phone:   +45 35 87 52 64
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