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rlespiff - Use simple contrast enhancement to "spiff up" an image.
rlespiff [ -b blacklevel ] [ -s ] [ -t threshold ] [ -w whitelevel
] [ -o outfile ] [ infile ]
Rlespiff "spiffs up" an image by
stretching the contrast range so that the darkest pixel maps to black and
the lightest to white. If the -s flag is given, the color channels will
be treated separately. This will likely cause some drastic color shifts.
- -b blacklevel
- The darkest input pixel will map to this pixel value
in the output image. The default is 0.
- -s
- If specified, each color channel
will be mapped separately.
- -t threshold
- This argument controls the number
of samples of a pixel value that should be considered insignificant (and
will therefore be ignored). It is specified in pixels/million. A threshold
of 4 applied to a 512x512 image would mean that any value that existed
at only one pixel would be ignored. The default value is 10.
- -w whitelevel
- The lightest input pixel will map to this pixel value in the output image.
The default is 255.
- -o outfile
- If specified, the output will be written to
this file. If outfile is "-", or if it is not specified, the output will
be written to the standard output stream.
- infile
- The input will be read
from this file. If infile is "-" or is not specified, the input will be
read from the standard input stream.
urt(1)
, RLE(5)
.
Spencer
W. Thomas
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