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+This module provides support for decoding PNG images per the PNG specification
+version 1.2:
+
+http://www.libpng.org/pub/png/spec/1.2/
+
+To read an image all at once, see [[load]]. The PNG image data is returned
+unmodified; the user is responsible for converting to the pixel format of their
+choice. To read an image incrementally, see [[newreader]].