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The Book of GIMP by Karine Delvare, Olivier Lecarme

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Chapter 11. Layers

Layers are so central to GIMP that without them, this powerful application would be almost useless. Instead, we would only be able to use GIMP for simple drawings or minor photo touch-ups. All of GIMP’s more powerful and versatile features rely on layers.

When an image has multiple layers, the GIMP workspace acts as a stack of transparencies. Draw or paint on these transparencies, or arrange parts of an existing picture on separate layers. Set the layers’ visibility, or adjust how transparent they are or how they blend with other layers. Move them around the canvas and control their order in the layer stack. Duplicate a layer before changing it so an intact copy remains in case you make a mistake or want to use the layer for ...

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