Section: User Commands (1)
Updated: 22 July 1992
Reads a portable pixmap as input, performs a simplistic grayscale assignment intended for use with grayscale or bitmap printers.
Often conversion from ppm to pgm will yield an image with contrast too low for good printer output. The program maximizes contrast between the gray levels output.
A ppm input of n colors is read, and a pgm of n gray levels is written. The gray levels take on the values 0..n-1, while maxval takes on n-1.
- Sort input colors by the number of times a color appears in the input, before mapping to evenly distributed graylevels of output. -intensity Sort input colors by their grayscale intensity, before mapping to evenly distributed graylevels of output. This is the default.:
Copyright (C) 1993 by Dan Stromberg.