Convert pef to pnm Online: pef2pnm
You can use Tom's Editor to easily convert images from
Pentax Electronic File .PEF to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Pentax Electronic File is an image format with extension PEF.
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.