> * http://www.libpng.org/pub/png/PngSuite/basn4a16.png - This is a > grayscale png with an alpha channel. That's the situation where we use > the png_set_gray... function that was removed.
Errr.. I may actually be thinking of http://www.libpng.org/pub/png/PngSuite/tbbn1g04.png
