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The Digital Photography Workflow Handbook by Uwe Steinmueller, Juergen Gulbins

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Using Masks to Increase Luminance

We learned the following technique for increasing image brilliance (luminance) from Katrin Eismann. As we have already seen, a mask is nothing more than a grayscale image, and a luminosity mask is actually a monochrome image created from an existing color image using grayscale values that represent the colors present in the original. A luminosity mask is easy to create.

  1. We open the Channels panel, select RGB, and load the selection by clicking on the icon. (To change the luminance of a single channel, select the Channels panel and use it for your selection or mask.)

  2. We then save the selection (Select ▸ Save Selection ...

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