Convert icon to pnm Online: icon2pnm
You can use Tom's Editor to easily convert images from
Sun icon image .ICON to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Sun icon image is an image format with extension ICON.
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.