Convert brush to pnm Online: brush2pnm
You can use Tom's Editor to easily convert images from
Doodle brush file .BRUSH to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Doodle brush file is an image format with extension BRUSH.
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.