Problems converting layered rgb files with transparency to cmyk files retaining the layers.

10.7.4/Mac Pro/PhotoshopCS6 13.0 - When cmyk converting a multilayered rgb file layers containing transparency doesn't convert to same profile as layers not including transparency, e.g. a product with a shadow - each on separate layers. the product layer is converted to working Color settings but the transparent layer isn't and is converted completely different, both grayscale and UCR/GCR.
Any suggestions?
Tom

Sorry c.pfaffenbichler, but I'm not giving in - and as you have not really produced any facts to explain this I will see this as a Photoshop bug.
If you make a simple two-point gradient in CMYK the gradient will (according to your settings) create a transition between the two colors.
If one of the colors is 87/78/64/92 and the other 0/0/0/0 then the resulting intermediate steps will depend on those two colors – the CMYK space’s GCR settings have no influence here.
Edit: To clarify: The CMYK space’s GCR settings determine how the default »black« is formed, but a gradient in CMYK is not dependent on those GCR settings. Otherwise all gradients would have to be dragged through the PCS and that would not make sense if somebody decides to make a gradient with certain CMYK colors.
And as I have tried to explain: A black to transparent gradient layer is basically a black layer with a transparency, so again: the CMYK GCR settings do not play into this.
Just convert a RGB black to transparent Layer to CMYK, rasterize it and then apply Layer > Layer Mask > From Transparency, then turn off the Layer Mask.
Whether you »give in« or not does not change the way these things are.
knowing there's a flaw in Photoshop, not letting us see what transparents really look like when converted...?
The flaw seems to be in your understanding, not in Photoshop.
Working in RGB and CMYK has relevant differences.
In RGB there is true black, in CMYK true black would have to be 100/100/100/100 which would violate the requirements for many or most processes.
And a CMYK space’s GCR settings are applied in conversion, when you yourself work in CMYK and commit a blunder (meaning things like exceeding the TAC, arbitrarily mixing grays, …) the problems are of your own making.
Edit: To restate: »expecting a layered image to appear identically in RGB and CMYK is simply not sensible depending on the image content and structure.«
The two color models are inherently different, the one additive, the other subtractive.

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