Archive:Kdenlive/Manual/Effects/Alpha manipulation: Difference between revisions

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== Effects - Alpha manipulation ==
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=== General Information about Alpha Manipulation  ===
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=== Effects - Alpha manipulation === <!--T:1-->


As far as I am aware Alpha Manipulation effects are allways used in combination with a composite transition. This because Alpha manipulation is to do with manipulating the so called "alpha-channel" of images and videos. The Alpha channel is data that describes how two images are to be combined (or composited) into one. So you need a composite transition on the timeline to tell Kdenlive that you are compsiting the videos from two different tracks into one image.
==== General Information about Alpha Manipulation ==== <!--T:25-->


For some background the Wikipedia article in [http://en.wikipedia.org/wiki/Alpha_compositing alpha compositing] is usefull. See also Porter, Thomas; Tom Duff (1984). "Compositing Digital Images". Computer Graphics 18 (3): p253–259 1984 [http://keithp.com/~keithp/porterduff/p253-porter.pdf pdf]
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Alpha Manipulation, more commonly known as Chroma Key compositing is an effect that changes the background of the picture to a different background the editor may want.


# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha gradient|Alpha gradient]]
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha operations|Alpha operations]]
More information can be found on the pages for the effects themselves:
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha shapes|Alpha shapes]]
 
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|Blue Screen]]
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Color Selection|Color Selection]]
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|Chroma Key ]] (for simple chroma key effects)</translate>
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Mask0Mate|Mask0Mate]]
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Color Selection|Color Selection]] (for complex chroma key effects)</translate>
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==== Effects in the Alpha Manipulation Category ==== <!--T:14-->
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha gradient|Alpha gradient]]</translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha operations|Alpha operations]]</translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Alpha shapes|Alpha shapes]]</translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|Chroma Key ]]</translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Color Selection|Color Selection]] </translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Mask0Mate|Rectangular Alpha mask]] </translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Rotoscoping|Rotoscoping]]
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Rotoscoping|Rotoscoping]]
# [[Special:myLanguage/Kdenlive/Manual/Effects/Misc/keysplillm0pup|Key Spill Mop Up]]
==== Compositing Reference Material ==== <!--T:15-->
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For some background, the Wikipedia article in [http://en.wikipedia.org/wiki/Alpha_compositing alpha compositing] is useful. See also Porter, Thomas; Tom Duff (1984). "Compositing Digital Images". Computer Graphics 18 (3): p253–259 1984 [http://keithp.com/~keithp/porterduff/p253-porter.pdf pdf]
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[[Category:Kdenlive]]
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Revision as of 13:41, 11 May 2019

Other languages:

Effects - Alpha manipulation

General Information about Alpha Manipulation

Alpha Manipulation, more commonly known as Chroma Key compositing is an effect that changes the background of the picture to a different background the editor may want.

More information can be found on the pages for the effects themselves:

  1. Chroma Key (for simple chroma key effects)
  2. Color Selection (for complex chroma key effects)



Effects in the Alpha Manipulation Category

  1. Alpha gradient
  2. Alpha operations
  3. Alpha shapes
  4. Chroma Key
  5. Color Selection
  6. Rectangular Alpha mask
  7. Rotoscoping
  8. Key Spill Mop Up

Compositing Reference Material

For some background, the Wikipedia article in alpha compositing is useful. See also Porter, Thomas; Tom Duff (1984). "Compositing Digital Images". Computer Graphics 18 (3): p253–259 1984 pdf

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