PNM

provides encoders and decoders for the portable anymap formats.

Warning 16 bit images are not supported.

pnm format depth support table

lib.rs:

crate for decoding/encoding the portable anymap format.

a quick guide to the various functions for everyday use

• [decode()]: your go-to for all PNM image decoding. If you have a specific format you need to support, use its module directly. Note that this function reads both plain and raw formats.
• [encode()]: this function is a little tricky. It supports the "older" PNM formats, and, due to their age they do not support the alpha channels existence. If possible, use pam::encode instead.
• encode_plain: The PAM format doesnt actually support read-age-by-humans, so this is still useful at times. Outputs data in decimal digits.

functions in action

let data = include_bytes!("../tdata/fimg-rainbowR.ppm");
let out = pnm::decode(data).unwrap();

assert_eq!(pnm::encode(out), data);