pnm2ppa/README.md

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pnm2ppa

PPA (Printing Performance Architecture) is a closed, proprietary protocol developed by Hewlett Packard for a short-lived series of DeskJet printers. In essence, the PPA protocol moves the low-level processing of the data to the host computer rather than the printer. This allows for a low-cost (to produce) printer with a small amount of memory and computing power.