pnmhistmap
Generate pixel value histogram images
TLDR
Create histogram visualization
$ pnmhistmap [input.pnm] > [histogram.pgm]
Specify output dimensions$ pnmhistmap -width [256] -height [100] [input.pnm] > [histogram.pgm]
SYNOPSIS
pnmhistmap [options] [file]
DESCRIPTION
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.
PARAMETERS
-width n
Output width.-height n
Output height.-white
Use white background.-verbose
Print statistics.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm