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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ImageMagick relies on Ghostscript to interpret PS / EPS / PDF / AI. Unfortunately, Ghostscript does not provide a device that supports CMYKA. We use the pamcmyk32 device. The format does support CMYKA but currently the device does not write the alpha channel. Perhaps more modern releases of Ghostscript does. If so, problem solved.
Here is the header from the pamcmyk32 device. Notice its missing the alpha component:
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# Image generated by GPL Ghostscript
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