Convert lispm to pnm Online: lispm2pnm

You can use Tom's Editor to easily convert images from
Lisp Machine bitmap .LISPM to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

LISPM

Lisp Machine bitmap is an image format with extension LISPM.

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.