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pngtodo.txt - list of things to do for libpng
for 0.9
medium memory model
improved dithering?
for 1.1
push reader
for 1.1 or later
overlaying one image on top of another
optional palette creation
histogram creation
text conversion between different code types
cHRM transformation
support for other chunks being defined (sCAl, the gIF series,
and others that people come up with).
pull writer
better dithering
keep up with public chunks
other compression libraries
more exotic interlace handling
better filtering (counting huffman bits? filter type inertia?)
C++ wrapper
other languages (pascal, for one)
comments of > 64K