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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Yes, ImageMagick version 7 supports variable pixel channels, version 6 does not. The problem was that the streaming interface allocated 3 channels but the coder might introduce a new channel, e.g. the alpha channel.