Replace one channel by another on only one layer, leaving the others intact?

Hello. In a CMYK image, I need to turn on only one layer one channel completely into another, while the others remain intact. The M channel (the M on that layer) contains information, but I can't print M in this place. I want to change it into an equal amount of K (or into C, in the present case, or even into a mixture of the two). I know how to do this to an entire image (change into greyscale, duotone or whatever may apply). But since I need this to apply to only one (or a selection of) layer(s), leaving all others intact, this is not an option here. I'm sure there's a way to achive this, but I can't find it. Any advice would be much appreciated.

bustamant wrote:
hello, thanks for your replies. As far as I understand, Channel Mixer (i.e., an Adjustment Layer containing a Channel Mixer applied to the layer in question) allows me to reduce one channel to zero,
You are completely correct up to here...
Then choose K as the desired output channel at the top of the palette and slide the M (source) slider to the desired value. You can choose more output channels by going to each output channel in turn.
The way it works is slightly confusing at first, but in a nutshell, you choose your output channel first, then mixture of sources. Then move to another output channel and the sources will be at the default position for THAT output channel only. Each channel has a set of source channels assigned to it.
Default; black output channel = 100% black source, 0% CMY
So your example is black output = 100% black source plus 100% mag source (although I expect you are going to change black source to 0)
AND magenta output = 0% Magenta 0% CYK source (no mag output at all)

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"Michael Fesser" <[email protected]> wrote in message
news:[email protected]..
> .oO(Mark A. Boyd)
>
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Replace one channel by another on only one layer, leaving the others intact?

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