Convert qrt to pnm Online: qrt2pnm

You can use Tom's Editor to easily convert images from
DKB Trace / Qrt raytrace .QRT to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

QRT

DKB Trace / Qrt raytrace is an image format with extension QRT.

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.