Convert ch4 to pnm Online: ch42pnm
You can use Tom's Editor to easily convert images from
4x8 font .CH4 to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
4x8 font is an image format with extension CH4.
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.