Convert cel to pnm Online: cel2pnm

You can use Tom's Editor to easily convert images from
Autodesk Animator .CEL to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

CEL

Autodesk Animator is an image format with extension CEL.

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.