Convert pnm to info Online: pnm2info
You can use Tom's Editor to easily convert images from
Portable aNy Map .PNM to Icon .INFO.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
PNM
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.
INFO
Icon is an image format with extension INFO.