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PPM
Abbreviation for Portable Pixmap
In short and in plain language
PPM is a very simple format for colour pictures.
It stores each dot of the picture on its own. The files are not made smaller.
You find it mostly in programs for pictures. It is rare on websites.
Definition
PPM is a very simple image format that stores colour images pixel by pixel without compression. It is mainly found in image editing software. It is rare on websites.