TODO list for libpng

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* Fix all defects (duh!)

* cHRM transformation.

* Palette creation.

* "grayscale->palette" transformation and "palette->grayscale" detection.

* Improved dithering.

* Multi-lingual error and warning message support.

* Complete sRGB transformation. (Currently it simply uses gamma=0.45455.)

* Man pages for function calls.

* Better documentation.

* Better filter selection

(e.g., counting huffman bits/precompression; filter inertia; filter costs).

* Histogram creation.

* Text conversion between different code pages (e.g., Latin-1 to Mac).

* Avoid building gamma tables whenever possible.

* Greater precision in changing to linear gamma for compositing against

background, and in doing rgb-to-gray transformations.

* Investigate pre-incremented loop counters and other loop constructions.

* Interpolated method of handling interlacing.

* More validations for libpng transformations.