Convert tn1 to pnm Online: tn12pnm
You can use Tom's Editor to easily convert images from
Tiny Stuff .TN1 to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Tiny Stuff is an image format with extension TN1.
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.