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:
- The width of the image as an unsigned, little-endian 16-bit integer.
- The height of the image as an unsigned, little-endian 16-bit integer.
- The bits of the image, ordered from left to right and top to bottom, packed eight to a byte. If the number of bits in an image is not an even multiple of eight, the extraneous bits in the last byte of the image are ignored.
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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