/[emacs]/emacs/lispref/frames.texi
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revision 1.57 by eliz, Tue Feb 26 16:48:59 2002 UTC revision 1.58 by rms, Wed Feb 27 05:29:00 2002 UTC
# Line 551  number you specify is whether it is grea Line 551  number you specify is whether it is grea
551    
552  @item screen-gamma  @item screen-gamma
553  @cindex gamma correction  @cindex gamma correction
554  If this is a number, Emacs performs ``gamma correction'' on colors.  The  If this is a number, Emacs performs ``gamma correction'' which adjusts
555  value should be the screen gamma of your display, a floating point  the brightness of all colors.  The value should be the screen gamma of
556  number.  Usual PC monitors have a screen gamma of 2.2, so the default is  your display, a floating point number.
557  to display for that gamma value.  Specifying a smaller value results in  
558  darker colors, which is desirable for a monitor that tends to display  Usual PC monitors have a screen gamma of 2.2, so color values in
559  colors too light.  A screen gamma value of 1.5 may give good results for  Emacs, and in X windows generally, are calibrated to display properly
560  LCD color displays.  on a monitor with that gamma value.  If you specify 2.2 for
561    @code{screen-gamma}, that means no correction is needed.  Other values
562    request correction, designed to make the corrected colors appear on
563    your screen they way they would have appeared without correction on an
564    ordinary monitor with a gamma value of 2.2.
565    
566    If your monitor displays colors too light, you should specify a
567    @code{screen-gamma} value smaller than 2.2.  This requests correction
568    that makes colors darker.  A screen gamma value of 1.5 may give good
569    results for LCD color displays.
570    
571  @item tool-bar-lines  @item tool-bar-lines
572  The number of lines to use for the toolbar.  A value of @code{nil} means  The number of lines to use for the toolbar.  A value of @code{nil} means

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