Why does my business card edge crack sometimes?
What is rich black and how can I get it?
The best match to use a rich black is the following: C 50 M 40 Y 40 K 100 This will give you a deep, dark, rich black.
How do I get a grayscale image in a CMYK document?
Don’t forget to check the CMYK values of your grayscale image in the final CMYK document. If there are other values than K in your grayscale image, there is a chance that the color will different.
To eliminate all values other than K, use your Channel Mixer (adjustment layer) in Photoshop, then click “Monochrome” and adjust accordingly. Please see the example below: