White text on a bitmap background 30C - 30M - 30Y - 100K - how to trap it?

I know is possible to trap a white text over a rich black if both of them are vector objects, I don't know if it is possible to get the same result if the rich black background is a bitmap coming from photoshop and is made by 100%  black and any percentage of the other three colors i.e. 30%.
I tried different times without success, is there a way to get it??
Thank you for any suggestion

can depend on the RIP. i think screen's Trueflow can, but i've had trouble doing this using AGFA apogee (if an agfa techie reading this knows how to do it, let me know!!!). I had a newsletter where white type was above a background similar to what you're talking about, but also had a picture of a person in the top left hand corner. luckily, the type was not near the person, so i was able to distinguish between the type and background, and put a vector rich black in behind the text but above the bitmap to trap the text.
otherwise there is a manual trapping solution where a black stroke the weight of the desired trap is applied to the text above the rich black bitmapped background. make sure the outline is to the outside of the type otherwise the type will become thinner. also need to make sure that the "overprint 100% black" in the handling of black preferences is turned OFF and then make sure black overprints elsewhere where it needs to.
this workaround is NOT recommended if the type is partially over the rich black bitmap and half over something else (because the keylines will be visible). its also a nusiance because it means manually setting all the black text to overprint like the old quark days... yuck.

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