hello,as the title, when i try to copy over png files with 1 bit, 2bit and 4bit grayscale png picutre to a pdf, the result in pdf is all black. however the library works fine with anything that is 8 bits grayscale higher. i am using the podofo-0.9.2 and libpng1618.i have posted my program on stackover flow, below is the linK:http://stackoverflow.com/questions/33002687/copying-1bit-2bit-4bit-grayscale-file-to-pdf-using-podofo-0-9-2-images-become many thanks for the library, it works great.ryan
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