Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
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As mentioned, the problem is that the extra samples are not specified as associated or unassociated alpha. See http://www.awaresystems.be/imaging/tiff ... mples.html. It states
However, even the TIFF library has a workaround for folks that do not honor this field. We will get this patch into the latest ImageMagick development release.If an extra sample is used to encode information that has little or nothing to do with alpha, ExtraSample=0 (EXTRASAMPLE_UNSPECIFIED) is recommended.