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What is PGM?
Portable Gray Map
As the full name states, the PGM format is used to store grayscale images. Although the format doesn't support color, it can hold thousands of shades between pure white and black to provide stunning imagery.
Data in PGM files is stored as a plain-text (ASCII) or a binary file with info on height, width, and two bytes of color data (8 or 16 bits) for each pixel.
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