CMYK - stands for Cyan, Magenta, Yellow and Black which are the printing inks used to make high-quality color publications. Photoshop enables to preview and to convert RGB image to CMYK color mode. CMYK color mode uses four channels, which contains 256 brightness levels the color space of CMYK color is not large as RGB color. Printing inks cannot fully capture everything in RGB mode. So even though more capability for colors is expressed in CMYK mode, it is not visually rich as RGB.

CMYK color model and the resulting colors RGB and Black are shown in the image when the primary colors overlap. CMYK color mode is subtractive. Adding all the primary colors together results in black as shown in the image

Make sure the Background is selected and the Layer1 eye icon is visible.

Choose Filter menu.

Click on Sharpen sub menu item.

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