PBJ is a really tiny, stupid image format for (monochrome) bitmaps. It's comparable to the PBM file format but it's even more trivial. The format goes like this:
It's not a very space-efficient format, but that's why God invented GZIP. If you pass this library a file ending in ".pbj.gz" or ".pbjz", it will decompress it for you.
We have, at times, used it in place of PNGs as a storage format since it's much more efficient to work with.
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