Snapshot a image frame and save it as a CMYK picture.

hi all,
I modified snapshot sample and change the color space to CMYK, when I snapshot a CMYK image, the result is not the same as the original picture. It seems the black color is not deep enough. I guess snapshot utility gets image information from bitmap in memory, so the color information is in RGB color space. If it is save as a CMYK picture, there will be a convertion, this lead to the distortion. Is that right? Or, there is a method to snapshot a CMYK image without distortion.
Thanks,
Dexter.

It's work properly in CS3.
I have the same problem in CS5.5
How I can resolve it?

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Attachments:
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Snapshot a image frame and save it as a CMYK picture.

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