Convert bob to pnm Online: bob2pnm
You can use Tom's Editor to easily convert images from
Bob Ray Tracer Bitmap .BOB to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Bob Ray Tracer Bitmap is an image format with extension BOB.
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.