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Clarify gamma correction.

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Richard M. Stallman 2002-02-27 05:29:00 +00:00
parent b83e4a7727
commit 3243b9f38e
1 changed files with 16 additions and 7 deletions
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lispref/frames.texi
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@ -551,13 +551,22 @@ number you specify is whether it is greater than zero.)
@item screen-gamma
@cindex gamma correction
If this is a number, Emacs performs ``gamma correction'' on colors. The
value should be the screen gamma of your display, a floating point
number. Usual PC monitors have a screen gamma of 2.2, so the default is
to display for that gamma value. Specifying a smaller value results in
darker colors, which is desirable for a monitor that tends to display
colors too light. A screen gamma value of 1.5 may give good results for
LCD color displays.
If this is a number, Emacs performs ``gamma correction'' which adjusts
the brightness of all colors. The value should be the screen gamma of
your display, a floating point number.
Usual PC monitors have a screen gamma of 2.2, so color values in
Emacs, and in X windows generally, are calibrated to display properly
on a monitor with that gamma value. If you specify 2.2 for
@code{screen-gamma}, that means no correction is needed. Other values
request correction, designed to make the corrected colors appear on
your screen they way they would have appeared without correction on an
ordinary monitor with a gamma value of 2.2.
If your monitor displays colors too light, you should specify a
@code{screen-gamma} value smaller than 2.2. This requests correction
that makes colors darker. A screen gamma value of 1.5 may give good
results for LCD color displays.
@item tool-bar-lines
The number of lines to use for the toolbar. A value of @code{nil} means