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Lesson 5. Importing and Linking Graphics > Working with alpha channels

Working with alpha channels

When an image has a background that isn't solid white or black, the Detect Edges feature may not be able to remove the background effectively. With such images, hiding the background's lightness values may also hide parts of the subject that use the same lightness values. Instead, you can use the advanced background-removal tools in Photoshop to mark transparent areas using paths or alpha channels, and let InDesign make a clipping path from those areas.

Note

If you place a Photoshop file that consists of an image placed on a transparent background, InDesign honors the transparency with no dependence on clipping paths or alpha channels. This can be especially helpful when you place an image with a soft or feathered edge.



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