Objects are created with the toolbox and the Objects Menu.
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The Object tools provide a wide variety of cut-out shapes to help you create objects from your image. To create a simple object, draw a marquee in the image with the selected Object Tool.
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Notice that the object is now on a separate layer, leaving the original image unaffected. You can now drag and drop this new object into another image.
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The Layers/Objects Roll-up allows you to adjust the feathering on a selected object, thereby blending the object's edge into the background.
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Once the object is merged, it is part of the original image.
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By clicking the Build Mode button, or enabling Build Mode from the Object Menu, you can create complex objects.
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By creating complex objects, you can marquee several areas in your image. These new objects are now part of the same group and reside on the same layer.
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Once a complex object has been created, it can be modified any way a simple object would be.