Convert dc1 to pnm Online: dc12pnm

You can use Tom's Editor to easily convert images from
DuneGraph (compressed) .DC1 to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

DC1

DuneGraph (compressed) is an image format with extension DC1.

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.