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A downgrade from 16-bit samples to 8-bit samples, or an expansion from 1- or 2-channel grayscale (or grayscale+alpha) to 3- or 4-channel RGB (or RGB+alpha), etc., may be deemed generally useful. Such image transforms could be made available to the user via command-line options. On the other hand, keeping the decision to disable or enable these transforms unconditionally at compile time (e.g. because they're needed to work around a specific printer's limitations) is less than ideal.
External contributions to libpng -------------------------------- This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".