pgmmake
creates a solid color PGM grayscale image of specified dimensions
TLDR
Create solid gray image
$ pgmmake [0.5] [100] [100] > [gray.pgm]
Create white image$ pgmmake 1.0 [200] [150] > [white.pgm]
Create black image$ pgmmake 0.0 [640] [480] > [black.pgm]
Specify max value$ pgmmake -maxval [65535] [0.5] [100] [100] > [gray16.pgm]
SYNOPSIS
pgmmake [options] grayval width height
DESCRIPTION
pgmmake creates a solid color PGM grayscale image of specified dimensions. The gray value is a fraction where 0.0 is black and 1.0 is white.
PARAMETERS
grayval
Gray level (0.0 = black, 1.0 = white).width
Image width in pixels.height
Image height in pixels.-maxval n
Maximum gray value (default 255).
50% gray 100x100 image
pgmmake 0.5 100 100 > gray.pgm
Black background
pgmmake 0 1920 1080 > black.pgm
16-bit white image
pgmmake -maxval 65535 1.0 100 100 > white16.pgm