Need a free image library, png, Visual Studio 6.0

Need a free image library that can handle png xresolution and yresolution.
I need it to be compatible with visual studio 6.0
I greatful for your help.

Maybe that would work but I can't find any info that libpng support metadata for x and yresolution.
GDI+ supports reading/writing image metadata, no external library needed. ImageMagick also has a C API which supports Visual Studio 6.
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