Convert rgba to pnm Online: rgba2pnm

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

Go to Tom's Editor

RGBA

Silicon Graphics RGB is an image format with extension RGBA.

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.