This is the command pnmhistmap 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
pnmhistmap - draw a histogram for a PGM or PPM file
SYNOPSIS
pnmhistmap [-black] [-white] [-max N] [-verbose] [pnmfile]
DESCRIPTION
Reads a portable anymap as input, although bitmap (PBM) input produces an error message
and no image. Produces an image showing a histogram of the color (or gray) values in the
input. A graymap (PGM) input produces a bitmap output. A pixmap (PPM) input produces
pixmap output with three overlaid histograms: a red one for the red input, a green one for
the green input, and a blue one for the blue input. The output is fixed in size: 256
pixels wide by 200 pixels high.
OPTIONS
-black Ignores the count of black pixels when scaling the histogram.
-white Ignores the count of white pixels when scaling the histogram.
The -black and -white options, which can be used seperately or together, are useful for
images with a large percentage of pixels whose value is zero or 255, which can cause the
remaining histogram data to become unreadbaly small. Note that, for pixmap inputs, these
options apply to all colors; if, for example, the input has a large number of bright-red
areas, you will probably want to use the -white option.
-max N Force the scaling of the histogram to use N as the largest-count value. This is
useful for inputs with a large percentage of single-color pixels which are not
black or white.
-verbose
Report the progress of making the histogram, including the largest-count value used
to scale the output.
All flags can be abbreviated to their shortest unique prefix.
Use pnmhistmap online using onworks.net services
