.pgm

Netpbm portable anymap image file, plain text or binary, read by Netpbm tools

Not yet supported

Format facts

MIME type: image/x-portable-anymap
Apple UTI: custom
Stock Quick Look: shown as plain text
Planned approach (census): syntax-highlight
Icon hint: generic-icon
Prevalence: niche

Renderer note (from the census)

pure Go trivial to parse P1-P6 headers and pixel data

Gotchas: ancient but used in scripts