Convert mrf to pnm Online: mrf2pnm
You can use Tom's Editor to easily convert images from
MRF image .MRF to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
MRF image is an image format with extension MRF.
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.