gAMA dates back to the days when hardly anyone had a clue about color primaries and colorspaces, let alone commonly tried to synchronize them across displays. It's explicitly ignored by everyone if the file uses any more modern method of signaling colorspace information, so really OP needs actually to write a colorspace to the file (cICP, iCCP, even an sRGB chunk) instead of merely claiming on their blog they wrote a colorspace.
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