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Converting a Grayscale B/W photo to as CMYK Rich Black

Converting a Grayscale B/W photo to as CMYK Rich Black

(OP)
Hi, I have some B/W photos that are going to be printed digitally on big outdoor banners.  I want them to be in Rich Black.  If I just convert the Grayscale image to CMYK, 100% Black becomes C=75, M=68, Y=67, K=90.  It looks OK on the screen but rich black in CMYK is usually like C=40, M=30, Y=30, K=100.   Is there a more pro way of converting the photos?  Any thoughts?  Thanks so much.

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