png decoding

[doxdici]

Hallo,
I am trying to decode the png format, but the result is not correct.
Anyone knows how to do that? It is applied the paeth algorithm, which is a combination of the byte above, the byte on the left and the upper left byte, but the reconstruction is not correct.
Thank you
Isabella

[VictorN]

Did you consider using CImage Class?

[doxdici]

Did you consider using CImage Class?

The problem is that the bytes of the image are form a pdf file. in this file, the bytes are encoded using png rules, so with these bytes i am not able to build the image, i have to decompress them before, it seems.

[VictorN]

And how do you get/read these bytes from a "pdf file"?