This is the command pnmdepth 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
pnmdepth - change the maxval in a portable anymap
SYNOPSIS
pnmdepth newmaxval [pnmfile]
DESCRIPTION
Reads a portable anymap as input. Scales all the pixel values, and writes out the image
with the new maxval. Scaling the colors down to a smaller maxval will result in some loss
of information.
Be careful of off-by-one errors when choosing the new maxval. For instance, if you want
the color values to be five bits wide, use a maxval of 31, not 32.
One important use of pnmdepth is to convert a new format 2-byte-per-sample PNM file to the
older 1-byte-per-sample format. Before April 2000, essentially all raw (binary) format
PNM files had a maxval less than 256 and one byte per sample, and many programs may rely
on that. If you specify a newmaxval less than 256, the resulting file should be readable
by any program that worked with PNM files before April 2000.
Use pnmdepth online using onworks.net services
