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About Objects
Simply put, an object is anything you can draw with one of the drawing operators. Objects are divided into three main groups: Paint, selection, and mask objects.
You manipulate Paint, selection, and mask objects in the same way; however, you use the objects for different purposes.
Paint objects create or modify pixels in the Paint branch.
Selection objects define a specific area of the screen within which other Paint objects or effects operate.
Add effects to selection objects to restrict the area upon which effects act.
Mask objects make areas of a layer transparent.
After you create an object, you can select it and change any of its properties (size, shape, color, opacity, and so on). If you draw an object on top of another object, you can still select the first object, change it, even move it on top of the newer one. Even eraser strokes are objects. If you erase a portion of the image, then move the eraser object, the previously erased pixels reappear.
Also, once you create one type of object (say a Paint rectangle), you can change it to another type of object of the corresponding type (either a rectangular selection or a rectangular mask).
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