By forming synthesis or edit images use a series of mathematical operations “mixed” or “merge” colors ghosting.
The rules governing this composition are included under what is known as Porter-Duff rules after the first article documented that structured.
Known as “compositing” the process and operations for adding (compose) to a new given image ghosting.
Thomas Porter y Tom Duff, members “Computer Graphics Project” in the company Lucasfilm Ltd. published an article entitled “Compositing Digital Images” as set out in “Computer Graphics Volume 18, Number 3 July 1984” published by ACM, which has become a key reference when analyzing the process of “superposition” Picture.
While we have described 12 operations or rules for the superposition of two images, key may be restricted to eight; we turn differentiate between cases where images are fully opaque or have a “channel” transparency.
Schematically, the following are the basic operations:
The meaning is presented in the following table, in which the fund is called “destination” and the new image “source”
| Name | Description |
| SrcOver | Place the pattern on the target source |
| DstOver | Destination on source |
| Clear | Deletes destination under the source |
| Src | Overlay source destination without alpha channel on |
| SrcIn | Ditto above but with alpha channel |
| DstIn | Displays the destination that matches the source |
| SrcOut | Part of the fountain outside the destination |
| DstOut | Part of the source destination outside |
- Image Synthesis
- Alpha Compositing (Wikipedia)
- Compositing Digital Images” “Computer Graphics Volume 18, Number 3 July 1984” published by ACM: © 1984 ACM 0-89791-138-5/84/007/0253
Image Synthesis
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