pnmhistmap

Create histogram visualization

$ pnmhistmap [input.pnm] > [histogram.pgm]

$ pnmhistmap -width [256] -height [100] [input.pnm] > [histogram.pgm]

pnmhistmap [options] [file]

pnmhistmap creates a visual histogram image showing the distribution of pixel values in a PNM image. The output is a PNM image where the horizontal axis represents sample values and the vertical axis shows how many pixels have each value.
For color images, separate histograms are drawn for each channel. The -width and -height options control the output image dimensions. The -white flag uses a white background instead of the default black, and -verbose prints statistical information about the distribution. Part of the Netpbm toolkit.

-width n

Output width.

Output height.

Use white background.

Print statistics.

pgmhist(1), ppmhist(1)