On Wed, 11 Jun 2003, Chris Simmonds wrote:
> Hi,
>
> I have a need to re-define "white" on an X server to be some other
> colour. I feel sure that it is a simple thing to do, but I can't quite
> see how.
>
> Here are some details
>
> Xfree86 4.2.1 running on Linux 2.4.18 kernel
> vesa driver
> LCD panel at 800x600x16
>
> Although it is a full colour panel the application only displays white
> text on a black background. I can't modify the application in any way,
> just the configuration of the X server.
>
> Anybody got any ideas?
It depends how the app works. If it's asking for "white" by
name you can change "white" globally in /usr/X11R6/lib/X11/rgb.txt
If it asks for colors by specifying r,g,b values explicitly
then you can change white by changing the gamma correction programatically
through the xf86VidMode extension. See the XF86VidModeSetGammaRamp
and XF86VidModeGetGammaRamp functions. Basically, get the gamma
ramp out and change the last value in the red, green, and blue arrays
to whatever you want white to be and set the modified gamma ramp.
Mark.
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