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A CMYK or grayscale TIFF reads its alpha from the first extra sample whose ExtraSamples value is 1 or 2, wherever it comes among the extra samples, at 8 and 16 bits, chunky or planar. TIFF 6.0 gives each extra sample its own ExtraSamples value, in order, and asks readers to skip extra samples they do not use. - A CMYK file with alpha after an unspecified extra sample was kept as opaque inks; it is now shown as RGB with its alpha. - A grayscale file with alpha after an unspecified extra sample opened opaque. - A six-sample CMYK file whose ExtraSamples tag lists only an unspecified value no longer reads that sample as transparency. - A white-is-zero grayscale file with an alpha channel opens; it failed to read before.