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In this example, the first two layers on top of the layer stack are hidden. The result image is the image of the third layer as shown at left. Since the third layer has all opaque pixels, covered the picture area from edge to edge, any layer beneath it will not be seen. Turning on and off the visibility of the background layer will not affect the final image. The Layers palette indicates the visible and hidden layers as shown in the bottom left screen shot. illustrates what the final image looks like if the visibility of each layer is turned on or off.



Here is another view of the layer stack with the third layer made invisible. The background layer now appears in the final image since the contents of the first two layers contain transparent pixels and do not completely cover all areas of the final image. Turning on or off the visibility of the background affects the appearance of the final image. This visual effect is essentially the foundation of photo composition. Photoshop provides many tools and facilities to quickly divide an original image into individual components stored in separate layers. By replacing or combining certain layers with different images, or modifying the image contents of a group of layers to enhance colors, correct defects or improve visual details, dramatic and photorealistic results can be achieved. The possibility is endless.

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