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Over Most conventional systems only allow for the placement of objects on top of one another as illustrated in fig d, which shows a over b over c.
In addition to this, OpenPage allows the use of transparency with all compositing operations, giving a professional and smooth presentation to combinations of objects. In the example above the over compositing operator has been used placing, fig e, over fig f, to generate fig g.
In In its simplest form the in compositing operation performs clipping. The effect can be seen below in fig j, where fig h, has been clipped to its intersection with fig i.
OpenPage incorporates transparency into the in operator. This can be applied to images and combined with other compositing operators.
In the above example the in compositing operator has been used to combine the picture of the beach fig k, with the circular transparency blends fig l, to simulate a reflection. This was then placed over the sand and sunglasses frame, fig m, to generate fig n.
Out The out operator, as the name suggests, achieves the opposite result to the in operator. So that instead of clipping an object to the area that is common to both, the out operator will remove from one object the area that is common to both shapes. fig o illustrates h out i.
The image above was generated using the out operator when compositing fig p, and fig q. This was then placed over fig s, to generate fig t
Atop Xor Plus As well as the powerful in, over and out compositing operators described above, OpenPage also provides atop, xor and plus compositing operators. These operators are explained in detail in the OpenPage manual.
An example of how graphic expressions can be used to generate artwork
can be found on the Graphic Expressions
page. Where the code used to generate the image has been included. Other
examples can be found in the Gallery. |
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Compositing Operators
