pngcheck reports that the png.C2.png file has a gAMA and a cHRM
chunk:
chunk gAMA at offset 0x00025, length 4: 0.45000
chunk cHRM at offset 0x00035, length 32
White x = 0.283 y = 0.298, Red x = 0.625 y = 0.34
Green x = 0.285 y = 0.605, Blue x = 0.15 y = 0.065
pngcheck reports that the png.C2.png file has a gAMA and a cHRM
chunk:
chunk gAMA at offset 0x00025, length 4: 0.45000
chunk cHRM at offset 0x00035, length 32
White x = 0.283 y = 0.298, Red x = 0.625 y = 0.34
Green x = 0.285 y = 0.605, Blue x = 0.15 y = 0.065
Those data values seem to be OK.