Fix typos in png.c (gama should be srgb) and add tRNS to the list of chunks
Fix typos in png.c (gama should be srgb) and add tRNS to the list of chunks

that can be excluded (for now an attempt to exclude tRNS does nothing).


leoz/ImageMagick,leoz/ImageMagick,leoz/ImageMagick,leoz/ImageMagick