[lug] Adjusting color balance

[Michael D. Hirsch]

On Friday 20 February 2004 10:31 am, Kevin Fenzi wrote:
> >>>>> "D" == D Stimits <stimits at comcast.net> writes:
>
> D> Elyse M. Grasso wrote:
> >> Is there a way to globally adjust the color balance of a monitor in
> >> X windows, instead of having to adjust each individual image and/or
> >> application? For some reason reds are weak on my laptop when it is
> >> booted into Linux. This is annoying when viewing DVDs and images,
> >> and doing color layouts.
> >>
> >> It might just be a pallete selection problem , but I'm not sure how
> >> to attack that either.
> >>
> >> (I'm running KRUD 9 and KDE).
> >>
> >> Windows seems less unbalanced, on the rare occasions when I boot
> >> into it.
> >>
> >> Are there good sample color wheels or other standard images I could
> >> use when trying to diagnose and tweak things?
>
> D> I think the answer will be dependent upon the particular video card
> D> and drivers. I say this because I expect it to be an XF86Config
> D> option that is implemented only if the driver authors decided to
> D> add it. The option is "gamma". Gamma correction can come in several
> D> flavors, one being just plain old gamma that is uniform across all
> D> colors; optionally some driver implementors might make available a
> D> separate gamma for each of the primary colors.
>
> Yeah, but you don't have to bother with an XF86Config option for any
> pretty recent version. Just use 'xgamma'.
>
> See 'man xgamma' for more details.
> You can set one overall value, or particular red/green/blue values.
> So, sounds like you want to increase the red...

If you're running kde 3.2 (well worth it--it's much zippier that 3.1.x with a 
bunch of new things) there is a GUI tool for this in the Control Center.  Go 
to Peripherals -> Display then select the "Monitor Gamma" tab.

Michael