not completely satisfied with sven's method, working on some pictures but not any, depending on the shades. I used to do it in CMYK a long time ago with photoshop by just pushing the image to CMYK and inverting the K curve. I guess something might be done with decompose color filter or so. But the quicker/best average i've found is just adding a mask based on the layer (L from Lab or N form CMYK could be used too), and play with the curve to adapt to the shades+refine with brush on mask. It takes few seconds if the picture is not too complex. Then put a white layer below and it's quite done. But i'm not completely satisfied with it.
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