A few months ago I started writing a .MPO (multiple pictures object) library in C based on libjpeg. This format is used to store 3D images (and some other formats).
Sadly I don't have much time and it's not finished yet (might finish it later) but I thought someone might be interested.
Here is a copy of the README :
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Main goal : *Load / Write Stereoscopic 3D images (Multi-frame Disparity) through libjpeg. *Give others enough material to work with *No exif library needed (though you'll probably want to use one) Currently working : *Decompression (see examples/decompress.c) *Basic compression *Compression of 3d stereo files, compatible with Nintendo 3DS and NVidia 3D viewer. Look at the example for more details Requirements : *libjpeg8 or later Documentation *The doxygen documentation is automatically generated after each commit. You can find it here. TODO (In order of priority): *Give a good interface for compression *Simplify usage of MPF attributes *Decompression : fix the image attributes parsing *A good refactoring *Remove printf and other debugging stuff *Everything else Will not be done : *Exif and other markers support (you should be able to write/read it trough your own handlers and libjpeg) Might not be done : *Helper functions for non stereoscopic images