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Ra_t16 converts between RADIANCE and Targa 16-bit or
24-bit RGB image files (type 2 in Targa's documentation). In
the default mode, a RADIANCE picture is converted to an RGB
file of the same horizontal and vertical dimensions with
16-bits per pixel. The -3 option tells the program to
produce a 24-bit image file instead. 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 -r option invokes a reverse
conversion, from a 16-bit or 24-bit Targa file to a RADIANCE
picture. The determination of depth is made automatically on
reverse translation, so the -2 and -3 options
are not necessary. If the output file is missing, the
standard output is used. |
