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But libPNG depends on zlibs deflate algorithm which is also used for zip compression and if you look here http://www.donanimhaber.com/ekran-karti/haberleri/AMD-GPUlar-ve-Fusion-icin-WinZip-165de-donanimsal-hizlandirma-destegi.htm
They are working on a OpenCL accelerated DEFLATE implementation.
I think after this you will find several OpenCL DEFLATE libs, which you then can use instead of zlib.
edit: but there is already a libjpeg built on opencl https://code.google.com/p/jpeg-opencl/