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TODO - list of things to do for libpng
fix problem with C++ and EXTERN "C"
add "grayscale->palette" transformation and "palette->grayscale" detection
color to gray transformation
improved dithering
multi-lingual error and warning message support
sPLT chunk handling
cHRM transformation
complete sRGB transformation (presently it simply uses gamma=0.45)
man pages for function calls
high-level API for reading images
final bug fixes
better documentation
better filter selection
(counting huffman bits/precompression? filter inertia? filter costs?)
optional palette creation
histogram creation
support for application-defined chunk handlers
keep up with public chunks
better C++ wrapper/full C++ implementation?
text conversion between different code pages (Latin-1 -> Mac and DOS)
improve API by hiding the info_ptr
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