Convert sgi to pnm Online: sgi2pnm

You can use Tom's Editor to easily convert images from
Silicon Graphics RGB .SGI to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

SGI

Silicon Graphics RGB is an image format with extension SGI.

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.