Convert duo to pnm Online: duo2pnm

You can use Tom's Editor to easily convert images from
DU1, DUO .DUO to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

DUO

DU1, DUO is an image format with extension DUO.

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.