From:	"Alexei A. Frounze" <alex DOT fru AT mtu-net DOT ru>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: 3 Newbie questions about graphics
Date:	Mon, 22 May 2000 00:21:03 +0400
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Christian wrote:
> 
> Hi, i have 3 questions
> 
> 1.  If i want to show a image on the screen, do i have to set a pallete for
> it?
> if so
> 2.  How do i create that pallete?  I haven't been able to find anything
> about it in allegro.txt.

Where is the 3rd one? :)

1. You need to setup palette, if your gfx mode is palettized (256 colors).
Hi/true-color gfx modes don't need palette. They work with RGB.

2. A. If your picture file holds a hi/true-color picture, you must make up a
palette from it for 256-colored gfx mode and convert the RGB image data to
8-bit indexes. You don't have to do that, if your gfx mode is the same
hi/true-color. 

2. B. If your picture file is 256-colored you get palette from the file.
Then you either setup that palette for 256-colored gfx mode or convert image
data to RGB for hi/true-color gfx mode depending on the palette stored in
the picture file.

Good Luck
Alexei A. Frounze
-----------------------------------------
Homepage: http://alexfru.chat.ru
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