300, Green 1.300, Blue 1.300
Values set with xgamma are temporary??”they will be reset when the X server is reset
or restarted. To permanently set the gamma correction factors when using the X.org
server, use a Gamma entry in the Monitor section of the xorg.conf file:
Section "Monitor"
Identifier "Monitor0"
VendorName "Samsung"
ModelName "205BW"
HorizSync 28.0 - 55.0
VertRefresh 55.0 - 70.0
Option "DPMS"
Gamma 1.21 1.30 1.22
EndSection
The arguments to the Gamma entry are separate red, green, and blue gamma values;
you can instead write a single value that will be applied equally to all channels.
But what values should you set? That??™s a difficult question, because the answer
depends on that material being displayed, the monitor hardware, and lighting conditions.
In most cases, you??™ll want your display??™s effective gamma to be around 2.2 (as
defined in the sRGB specification), but it??™s hard to know what correction factor will
give that to you.
9.4
140 Chapter 9: Color
To answer this question, Norman Koren has produced a set of web-based charts that
let you test and adjust your monitor??™s gamma by eye. These charts are available at
http://www.normankoren.com/makingfineprints1A.
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