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Clarify gamma correction.

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commit 5606c13e84d3f452bc9e012a92db18f6c77321de 1 parent b991c9e
Corg-kun authored February 27, 2002

Showing 1 changed file with 16 additions and 7 deletions. Show diff stats Hide diff stats

  1. 23  lispref/frames.texi
23  lispref/frames.texi
@@ -551,13 +551,22 @@ number you specify is whether it is greater than zero.)
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 @item screen-gamma
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 @cindex gamma correction
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-If this is a number, Emacs performs ``gamma correction'' on colors.  The
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-value should be the screen gamma of your display, a floating point
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-number.  Usual PC monitors have a screen gamma of 2.2, so the default is
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-to display for that gamma value.  Specifying a smaller value results in
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-darker colors, which is desirable for a monitor that tends to display
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-colors too light.  A screen gamma value of 1.5 may give good results for
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-LCD color displays.
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+If this is a number, Emacs performs ``gamma correction'' which adjusts
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+the brightness of all colors.  The value should be the screen gamma of
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+your display, a floating point number.
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+
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+Usual PC monitors have a screen gamma of 2.2, so color values in
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+Emacs, and in X windows generally, are calibrated to display properly
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+on a monitor with that gamma value.  If you specify 2.2 for
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+@code{screen-gamma}, that means no correction is needed.  Other values
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+request correction, designed to make the corrected colors appear on
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+your screen they way they would have appeared without correction on an
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+ordinary monitor with a gamma value of 2.2.
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+
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+If your monitor displays colors too light, you should specify a
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+@code{screen-gamma} value smaller than 2.2.  This requests correction
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+that makes colors darker.  A screen gamma value of 1.5 may give good
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+results for LCD color displays.
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 @item tool-bar-lines
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 The number of lines to use for the toolbar.  A value of @code{nil} means

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