This is the command ra_t8 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_t8 - convert RADIANCE picture to/from Targa 8-bit image file
SYNOPSIS
ra_t8 [ -d ][ -b ][ -c ncolors ][ -g gamma ][ -e +/-stops ][ -n sampfac ] input [ output ]
ra_t8 -r [ -g gamma ][ -e +/-stops ] [ input [ output ] ]
DESCRIPTION
Ra_t8 converts between RADIANCE and Targa 8-bit color-mapped image files (type 1 in
Targa's documentation). In the default mode, a RADIANCE picture is converted to a color-
mapped Targa file of the same horizontal and vertical dimensions with 8-bits per pixel.
The -d option turns off dithering. The -b option converts the image to black and white.
Only with this option can the input be taken from stdin. The -c option allows fewer than
256 colors. 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. The -r option invokes a reverse conversion, from an 8-bit
Targa file to a RADIANCE picture. If the output file is missing, the standard output is
used.
AUTHORS
Greg Ward
Anthony Dekker provided the code for neural network color quantization
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