NAME

       ftgamma - screen gamma calibration helper

SYNOPSIS

       ftgamma

DESCRIPTION

       The  ftgamma  demo  program  opens  a  window  showing series of gray stripes filled with solid color and
       checkered pattern of pixels.  Your monitor's gamma value roughly corresponds to the  horizontal  position
       where  the solid and checkered stripes are equally bright when seen from some distance.  Three brightness
       targets are explored: 33%, 50%, and 67%.  If the input-output curve of your monitor does not follow ideal
       power law relationship, you might observe slightly different gamma values at different brightness levels.
       It is also possible to examine gamma values for basic colors.

       Two alternative patterns relevant to font rendering are also provided, where slightly slanted  lines  are
       rendered  using  grayscale and subpixel anti-aliasing.  In the grayscale case, the correct gamma helps to
       achieve uniform perceived thickness of the lines.  The gamma value that corresponds  to  vanishing  moiré
       pattern  is ideal for anti-aliased font rendering.  In the subpixel case, the correct gamma removes color
       fringes that remain even after LCD filtering.

       This program does not have any options.

       This program is part of the FreeType demos package.