This is the command ra_gif that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
ra_gif - convert RADIANCE picture to Compuserve GIF
SYNOPSIS
ra_gif [ -b ][ -d ][ -c ncolors ][ -g gamma ][ -e +/-stops ][ -n sampfac ] input [ output
]
DESCRIPTION
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.
AUTHORS
Greg Ward
Paul Haeberli
David Rowley
Anthony Dekker provided the code for neural network color quantization
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