pgm
What is a .pgm file?
image/x-portable-graymap
PGM (Portable Graymap) is a Netpbm-family format storing single-channel greyscale images as ASCII or raw binary values with a simple text header. It uses no compression and supports 8- or 16-bit gray levels. It is frequently used in image processing and computer vision.
How to use a .pgm file
Use an example PGM to test greyscale parsing, verify intensity output from processing pipelines, or provide a simple input for computer-vision and OCR toolchains.