Convert ish to pnm Online: ish2pnm

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

Go to Tom's Editor

ISH

Image System is an image format with extension ISH.

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.