Convert mat to pnm Online: mat2pnm
You can use Tom's Editor to easily convert images from
MATLAB image format .MAT to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
MATLAB image format is an image format with extension MAT.
PNM images are uncompressed 24 bit RGB images. Can cannot store Alpha channel. PNM images come in 2 types: binary and text. Especially popular on Linux.