Convert pnm to cwg Online: pnm2cwg
You can use Tom's Editor to easily convert images from
Portable aNy Map .PNM to Create with Garfield
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
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.
Create with Garfield
is an image format with extension CWG.