Convert rpm to pnm Online: rpm2pnm

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

Go to Tom's Editor

RPM

Run Paint is an image format with extension RPM.

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.