[This announcement is for the developers of libpng-based PNG encoders.]
The lossless PNG image reduction code (opngreduc) is now available as a top-level module. Making your PNG encoder more efficient is as easy as an #include "opngreduc.h" and a call to opng_reduce_image().
The principle behind image reductions is explained in detailed in the PNG optimization guide, section 2.1 "The PNG image type".
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