Convert pnm to hfc Online: pnm2hfc
You can use Tom's Editor to easily convert images from
Portable aNy Map .PNM to Hires FLI by Crest .HFC.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
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.
Hires FLI by Crest is an image format with extension HFC.