DragonFly On-Line Manual Pages

RLESPIFF(1)            DragonFly General Commands Manual           RLESPIFF(1)

NAME
       rlespiff - Use simple contrast enhancement to "spiff up" an image.

SYNOPSIS
       rlespiff [ -b blacklevel ] [ -s ] [ -t threshold ] [ -w whitelevel ] [
       -o outfile ] [ infile ]

DESCRIPTION
       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.

OPTIONS
       -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.

SEE ALSO
       urt(1), RLE(5).

AUTHOR
       Spencer W. Thomas

4th Berkeley Distribution        June 12, 1990                     RLESPIFF(1)