Convert rast to pnm Online: rast2pnm
You can use Tom's Editor to easily convert images from
Sun rasterfile .RAST to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Sun rasterfile is an image format with extension RAST.
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.