OpenEuphoria

Re: Palette Problem

• Posted by Lucius Hilley III <lhilley at CDC.NET> May 13, 1999
• 446 views

Hello Colin:
  This is Lucius,  Remapping palettes does work great MOST of the time but
after working with several images I have found several problems with it.
1. If it does work and work well you would want to save a copy of the image
   with the new palette.  Remapping on the fly is a little slow.
2. 1 reason it may not work is that you have an image that has abundance of
   1 color in the palette. Example: an image of Lava would have a palette
   consumed with different shades of red. And an image of the sky would
   have many blues.  These 2 images won't simply remap very well from their
   palette to the others palette.  You may have to Build a new palette that
   is a partial mixture of the 2 and remap both images to it.
3. I doubt Colin took this into account but I may be wrong.  I know I took
   it into account when writing my rountines and gave up before solving
   the problem of drastically different palettes.  I think Pete Eberlein
   wrote some excellent routines in this area.  NOT SURE.

   Lucius L. Hilley III

On Thu, 13 May 1999 10:24:43 -0400, Colin Taylor <cetaylor at COMPUSERVE.COM>
wrote:

>Message text written by Gwen:
>>I've a little problem using palette in Eu using Read_bitmpap() : How
>to Change a palette of a Bmp ? :
>I want to use only one palette but my Bmps don't have the same pal, And I
>don't know how to display 2 Bmp with differents pals at the same time on
>Screen. Can you help me a bit please ?<
>
>Only one palette can be active, so if you try to show two images with
>different palettes at the same time, the colors of one will be wrong.  The
>easiest solution is to convert one image to the palette of the other.  I
>wrote some palette utilities for just this purpose, which are posted on the
>RDS web page (recent contributions).  HTH.
>
>Colin