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Ra_gif converts from RADIANCE to Compuserve GIF
color-mapped, compressed image files. In the default mode, a
RADIANCE picture is converted to a color-mapped GIF file of
the same horizontal and vertical dimensions with 8-bits per
pixel. The -b option converts the image to black and
white. The -d option turns off dithering. The
-c option allows fewer than 256 colors (and fewer
than 8 bits per pixel). The -g option specifies the
exponent used in gamma correction; the default value is 2.2.
An exponent of 1.0 turns gamma correction off. The -e
option specifies an exposure compensation in f-stops (powers
of two). Only integer stops are allowed, for efficiency. The
-n option specifies a sampling factor for neural
network color quantization. This value should be between 1
and 80, where 1 takes the longest and produces the best
results in small areas of the image. If no value is given, a
faster median cut algorithm is used. If the output file is
missing, the standard output is used. |
