pgmslice(1) General Commands Manual pgmslice(1)NAME
pgmslice - extract one line of pixel values out of a portable graymap
pgmslice -row|-col line [pgmfile]
Extracts one line of pixel values out of a portable graymap and outputs it in a two column ascii format, with the first value being the
pixel's position in the line and the second value the pixel's greyscale value. This is useful for making cross sections through, for exam-
ple, greyscale CCD images.
OPTIONS -row Extract a row of pixels
-col Extract a column of pixels
SEE ALSO pgm(5)AUTHOR
pgmslice was written by Jos Dingjan <email@example.com> after being unable to find the source code to Marco Beijersbergen's program with the
22 May 2000 pgmslice(1)
Check Out this Related Man Page
pgmnorm(1) General Commands Manual pgmnorm(1)NAME
pgmnorm - normalize the contrast in a portable graymap
pgmnorm [-bpercent N | -bvalue N] [-wpercent N | -wvalue N] [pgmfile]
Reads a portable graymap as input. Normalizes the contrast by forcing the lightest pixels to white, the darkest pixels to black, and lin-
early rescaling the ones in between; and produces a portable graymap as output.
By default, the darkest 2 percent of all pixels are mapped to black, and the lightest 1 percent are mapped to white. You can override
these percentages by using the -bpercent and -wpercent flags, or you can specify the exact pixel values to be mapped by using the -bvalue
and -wvalue flags. Appropriate numbers for the flags can be gotten from the pgmhist tool. If you just want to enhance the contrast, then
choose values at elbows in the histogram; e.g. if value 29 represents 3% of the image but value 30 represents 20%, choose 30 for bvalue.
If you want to lighten the image, then set bvalue to 0 and just fiddle with wvalue; similarly, to darken the image, set wvalue to maxval
and play with bvalue.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO pgmhist(1), ppmnorm(1), pgm(5)AUTHOR
Partially based on the fbnorm filter in Michael Mauldin's "Fuzzy Pixmap" package.
Copyright (C) 1989 by Jef Poskanzer.
28 February 1989 pgmnorm(1)
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