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++ Added pngxtern, a libpng add-on for external image format
support: BMP (uncompressed), GIF, PNM.
(This was incorporated from OptiPNG-Plus.)
++ Implemented RGB(A)-to-palette reductions.
+ If trials are ended prematurely, detailed progression is only
reported under the user option -v.
- Removed reporting of some IDAT sizes that exceeded the optimum.
(This was NOT a bug, but a "feature" that confused some users.)
! Fixed an RGB-to-gray reduction problem that occured under some
specific background colors.
+ Added support for builds based on the system-supplied zlib.
* Modified LICENSE. It is now a verbatim spell of the zlib license.
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PKGREVISION for dependency change.
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without losing any information. The idea has been inspired from pngcrush, and
is explained in detail in the PNG-Tech article: "A Guide to PNG optimization"
<http://www.cs.toronto.edu/~cosmin/pngtech/optipng.html>. The implementation
is carried forward in OptiPNG, which offers a faster execution per trial, and
a wider search space.
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