1TODO - list of things to do for libpng:
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3* Fix all defects (duh!)
4* Better C++ wrapper / full C++ implementation (?)
5* Fix the problems with C++ and 'extern "C"'.
6* cHRM transformation.
7* Palette creation.
8* "grayscale->palette" transformation and "palette->grayscale" detection.
9* Improved dithering.
10* Multi-lingual error and warning message support.
11* Complete sRGB transformation.  (Currently it simply uses gamma=0.45455.)
12* Man pages for function calls.
13* Better documentation.
14* Better filter selection
15  (e.g., counting huffman bits/precompression; filter inertia; filter costs).
16* Histogram creation.
17* Text conversion between different code pages (e.g., Latin-1 -> Mac).
18* Avoid building gamma tables whenever possible.
19* Greater precision in changing to linear gamma for compositing against
20  background, and in doing rgb-to-gray transformations.
21* Investigate pre-incremented loop counters and other loop constructions.
22* Interpolated method of handling interlacing.
23* More validations for libpng transformations.
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