change cmy to k

Question

HelloI have a document (cmyk mode) with a bunch of layersI want to convert a single layer (not  text) from all  cmyk chanels to black channel only?How to do that?thanks

Stephen Marsh · Accepted Answer

Use channel mixer directly to the layer, or even better as a clipped adjustment layer above the layer, without changing modes from CMYK in the original.

Otherwise I'd work on a grayscale mode copy and paste the results back into the K channel of the original layer, removing the originaldata from the CMY channels of the target layer (again, without changing modes from CMYK in the original).

Myra Ferguson · Answer

You can make a single layer grayscale by adding an adjustment layer and clipping it with the layer that you to be affected while leaving the other layers as they were. Here's how:Change the color mode to RGB temporarily by going to Image > Mode > RGB (otherwise, the Blank and While adjustment layer will be inaccessible)If you have smart objects, a dialog will ask if you want to rasterize them. Most likely not, so click Don't RasterizeSelect the layer you want to make grayscale (selecting it will make Photoshop place the adjustment layer above this layer)Go to Layer > New Adjustment Layer > Black and White (a dialog will open to name it. You can click OK)With the adjustment layer still selected, go to Layer > Create Clipping MaskSelect the adjustment layer and the affected layer and go to Layer > Smart Objects > Convert to Smart Object (if you leave the adjustment layer, going back to CMYK will remove it)Go to Image > Mode > CMYK to go back to CMYK

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