Tom's Editor BLOG

Convert pnm to hdiff Online: pnm2hdiff

You can use Tom's Editor to easily convert images from
Portable aNy Map .PNM to Horizontal difference image .HDIFF.
Tom's Editor is a free, online image manipulation and converter program.

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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.

HDIFF

Horizontal difference image is an image format with extension HDIFF.