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==== Hint for previewing the alpha manipulation effects ==== <!--T:9-->


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The preview in Project monitor might go all strange when you select the composite transition in the timeline or the Video 1 in the timeline.  (Reported at bug [http://www.kdenlive.org/mantis/view.php?id=2990 2990] and fixed in ver >=0.9.5 of Kdenlive)
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[[File:Weird preview look.png|400px|left]]
This is what the project monitor looks like when you have just selected the composite transition in the timeline. This is not what the rendered video will look like.
To get a preview of what the rendered video will look like, you need to click Video 1 and then Video 2 in the timeline.
<br style="clear: both;"/>
<!--T:12-->
[[File:Two tracks composite transition with alpha info.png|400px|left]] What the preview looks like once you select Video 2 in the timeline. This is what the rendered file will look like
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==== Effects in the Alpha Manipulation Category ====  
==== Effects in the Alpha Manipulation Category ====  
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|Chroma Key ]] (for simple chroma key effects)</translate>
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|Chroma Key ]</translate>
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<translate>
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# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Color Selection|Color Selection]] (for complex chroma key effects)</translate>
# [[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]] (Formerly Mask0Mate)</translate>
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Mask0Mate|Rectangular Alpha mask]] </translate>
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<translate>
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Rotoscoping|Rotoscoping]]
# [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Rotoscoping|Rotoscoping]]

Revision as of 13:04, 31 March 2019

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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. [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen|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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