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Mastering Photoshop

Looking Sharp

Is there an advantage to using the Unsharp Mask filter (or any sharpening filter) on individual channels?

There can be. Unsharp masking can cause color shifts in an image, especially images in CMYK mode. To sharpen just the brightness component of an image rather than the color components of an image, convert the image to Lab mode (Image, Mode, Lab Color), select the Lightness channel in the Channels palette, and apply the Unsharp Mask to just the Lightness channel.


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