Difference between revisions of "Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen"

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(Heavily update chroma key page - was quite outdated)
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==== Blue Screen ==== <!--T:1-->
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==== Chroma Key==== <!--T:1-->
  
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[http://www.mltframework.org/bin/view/MLT/FilterFrei0r-bluescreen0r FilterFrei0r-bluescreen0r]
 
  
 
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This effect allows you to do Chroma Keying (Chroma key compositing/Green Screen) on '''Kdenlive'''. That is you can use the Blue Screen effect to generate alpha channel information allowing two video tracks to be combined using the [[Special:myLanguage/Kdenlive/Manual/Transitions/Composite|Composite transition]].
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This effect allows you to do Chroma Keying (also known as Green Screen or Blue Screen) in '''Kdenlive'''. Chroma keying is where you remove backgrounds of a similar colour. This effect is a very basic. For a more complication alpha manipulation/background removal effect, use  [[Special:myLanguage/Kdenlive/Manual/Effects/Alpha manipulation/Color Selection|Colour Selection]]
  
 
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{{Note|Alternatively you can combine two video tracks together using the [[Special:myLanguage/Kdenlive/Manual/Transitions/screen|screen]] transition (if one of them is filmed on a black background).}}
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For black backgrounds, the [[Special:myLanguage/Kdenlive/Manual/Transitions/screen|screen]] transition is slightly more effective.  
 
 
===== Tutorial 1 ===== <!--T:5-->
 
 
 
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Youtube video on Chroma Keying which uses the Blue Screen effect
 
  
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Here are some video tutorials on how to use chroma key.
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===== Basic Chroma Keying Tutorial =====
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Note: '''Adding a composite transition is no longer required.'''
 
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{{#ev:youtube|DLHa6Gkv45Q}}
 
{{#ev:youtube|DLHa6Gkv45Q}}
  
===== Tutorial 2 ===== <!--T:8-->
 
  
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===== Chroma Key tutorial outlining touchups =====
Another video on chroma keying / green screen. This one also shows you how to use  [[Special:MyLanguage/Kdenlive/Manual/Effects/Alpha_manipulation/Rotoscoping|rotoscoping]] to remove stuff you do not want from out of your frame. It also means you don't need to fill your whole frame with the green screen either.
 
  
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Also uses
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Shows usage of the following effects: [[Special:MyLanguage/Kdenlive/Manual/Effects/Alpha_manipulation/Blue_Screen|blue screen]], [[Special:MyLanguage/Kdenlive/Manual/Effects/Alpha_manipulation/Alpha_operations|alpha operations]] - shrinkhard, [[Special:MyLanguage/Kdenlive/Manual/Effects/Enhancement/Denoiser|denoiser]] and [[Kdenlive/Manual/Effects/Misc/keysplillm0pup|Key Spill Mop Up]]  
 
 
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* [[Special:MyLanguage/Kdenlive/Manual/Transitions/Composite|Composite Transition]].
 
 
 
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* Crop and Transform>[[Special:MyLanguage/Kdenlive/Manual/Effects/Crop_and_transform/Pan_and_Zoom|Pan and Zoom effect]]
 
 
 
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* Enhancment>[[Special:MyLanguage/Kdenlive/Manual/Effects/Enhancement/Sharpen|Sharpen Effect]]
 
 
 
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{{#ev:youtube|_6gxHLCFhLQ}}
 
 
 
===== Tutorial 3 ===== <!--T:15-->
 
 
 
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Tutorial  showing how to use the "Blue screen" function and keyframes to animate one image moving over another in the '''Kdenlive''' video editor
 
 
 
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Also uses
 
 
 
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* [[Special:MyLanguage/Kdenlive/Manual/Transitions/Composite|Composite Transition]]
 
* [[Special:MyLanguage/Kdenlive/Manual/Effects#Using_Keyframes_in_effects|Keyframes]]
 
 
 
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{{#ev:youtube|M8hC5FbIzdE}}
 
 
 
===== Tutorial 4 ===== <!--T:20-->
 
  
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Note: '''This video is outdated.''' In newer versions of kdenlive have the [[Kdenlive/Manual/Effects/Misc/keysplillm0pup|Key Spill Mop Up]] effect intsalled by default, and it is no longer required to use a composite transition.
Shows usage of the following effects: [[Special:MyLanguage/Kdenlive/Manual/Effects/Alpha_manipulation/Blue_Screen|blue screen]], [[Special:MyLanguage/Kdenlive/Manual/Effects/Alpha_manipulation/Alpha_operations|alpha operations]] - shrinkhard, [[Special:MyLanguage/Kdenlive/Manual/Effects/Enhancement/Denoiser|denoiser]] and [[Kdenlive/Manual/Effects/Misc/keysplillm0pup|keysplillm0pup]]
 
  
 
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See also [[Kdenlive/Manual/Effects/Misc/keysplillm0pup|keysplillm0pup]] effect in the Misc group. The keyspillm0pup effect can be used to improve the edges of the blue screen effect - when edge problems are caused by "keyspill". Keyspill is when the color of the screen used for colorkeying spills onto the subject due to light reflection.
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See also [[Kdenlive/Manual/Effects/Alpha manipulation/Rotoscoping|Rotoscoping]] effect. Rotoscoping is where you manual draw a region, and everything outside/inside that region will disappear. This is useful for backgrounds with multiple different colours.
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See also [[Kdenlive/Manual/Effects/Misc/keysplillm0pup|Key Spill Mop Up]] effect in the Misc group. The keyspillm0pup effect can be used to improve the edges of the blue screen effect - when edge problems are caused by "keyspill". Keyspill is when the color of the screen used for colorkeying spills onto the subject due to light reflection.
  
 
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See also [[Kdenlive/Manual/Effects/Alpha_manipulation/Color_Selection|Color Selection]] which also does color based alpha selection.  
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See also [[Kdenlive/Manual/Effects/Alpha_manipulation/Color_Selection|Colour Selection]] which also does color based alpha selection, but in a much more detailed fashion. Use it for less contrasting or more complex backgrounds.
 
 
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see [http://www.kdenlive.org/forum/greenscreen-keying-edge this] thread for some discussion on chroma keying issues in '''Kdenlive'''
 
  
 
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Revision as of 18:33, 30 September 2018

Other languages:
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Chroma Key

This effect allows you to do Chroma Keying (also known as Green Screen or Blue Screen) in Kdenlive. Chroma keying is where you remove backgrounds of a similar colour. This effect is a very basic. For a more complication alpha manipulation/background removal effect, use Colour Selection

For black backgrounds, the screen transition is slightly more effective.

Here are some video tutorials on how to use chroma key.

Basic Chroma Keying Tutorial

Note: Adding a composite transition is no longer required.


Chroma Key tutorial outlining touchups

Shows usage of the following effects: blue screen, alpha operations - shrinkhard, denoiser and Key Spill Mop Up

Note: This video is outdated. In newer versions of kdenlive have the Key Spill Mop Up effect intsalled by default, and it is no longer required to use a composite transition.

See also

See also Rotoscoping effect. Rotoscoping is where you manual draw a region, and everything outside/inside that region will disappear. This is useful for backgrounds with multiple different colours.

See also Key Spill Mop Up effect in the Misc group. The keyspillm0pup effect can be used to improve the edges of the blue screen effect - when edge problems are caused by "keyspill". Keyspill is when the color of the screen used for colorkeying spills onto the subject due to light reflection.

See also Colour Selection which also does color based alpha selection, but in a much more detailed fashion. Use it for less contrasting or more complex backgrounds.


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