Re: Night mode

[Elladan <elladan eskimo com>]

Take a look at the "xgamma" program that ships with XFree4.  You can change the
gamma curves using that API on a per-channel basis, so you can eg. push the
green and blue channels down.  This won't quite give you what you want (you
really want to change the brightness, not just the gamma curves) but it's
close.

Perhaps someone else knows how to modify brightness levels for the entire
display.  I don't.  :-)

-J

On Thu, May 24, 2001 at 09:11:52AM -0700, Patrick Cannon wrote:
> Hi,
>
> Many commercial astronomy applications have a "Night
> mode" that basically gives a red or blue tint to the
> entire screen to help the users night vision.
>
> Does anyone know how to do this using GTK+ or GDK?
> Can this be done with regular X calls?  
>
> Could someone provide me a small example or point me
> in the right direction?
>
> Thanks for you help,
> Patrick Cannon