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.