View source for Checkmate

 {{FilterCat5|External_filters|Plugins|Plugins_x64|Restoration_filters|Rainbow & Dot Crawl Removal}}
{{Filter3
| {{Author/mf}}, prunedtree, [https://github.com/tp7 tp7]
| 0.9
| [https://github.com/tp7/checkmate/releases checkmate.zip]
| Rainbow & Dot Crawl Removal
| Open Source
|}}

== Description ==
Spatial and temporal dot crawl reducer. Checkmate is most effective in static or low motion scenes. When using in high motion scenes (or areas) be careful, it's known to cause artifacts with its default values.

*[https://github.com/tp7/checkmate Checkmate for AviSynth 2.6] - open source, better performance, less bugs, and supports all [[planar]] colorspaces. [https://github.com/tp7/checkmate/releases Download] | [http://forum.doom9.org/showthread.php?t=169832 Discussion]<br>In this version {{Template:FuncDef|tthr2}} is (by default) set to 0, also this version has a bit lower precision than the original. The difference is hardly noticeable when you're looking for it.
<br>

== Requirements ==
* AviSynth 2.5.8 or [http://sourceforge.net/projects/avisynth2/ greater]
* Supported color formats: [[YV12]]
<br>

== [[Script variables|Syntax and Parameters]] ==
:{{Template:FuncDef|checkmate (''clip'', ''int'' "thr", ''int'' "max", ''int'' "tthr2")}}
<br>
::{{Par2| |clip| }}
:::Input clip.
<br>
::{{Par2|thr|int|12}}
:::Spatial threshold that control the spatial filtering.
:::Higher values will blend more but cause artifacts if set too high. If set too low, lines in static scenes where dot crawl was reduced will become slightly more blurry.
<br>
::{{Par2|max|int|12}}
:::Controls the maximum amount by which a pixel's value may change. Higher values will increase the strength of the filtering but cause artifacts if set too high.
<br>
::{{Par2|tthr2|int|5}}
:::Temporal threshold that controls the temporal blending; higher values will blend more but cause artifacts if set too high.
:::Setting this to 0 disables the temporal blending entirely. This may be helpful to reduce temporal artifacts in high motion scenes.
<br>
::<span style="color:red">'''Note:'''</span> Official documentation was never released. A valid range is unknown for all parameters. It's probably best to set those values not ''too'' distant from their defaults.
<br>

== Examples ==
Checkmate with default values:
 [[DGDecode|MPEG2Source]]("DotCrawl.d2v")
 checkmate(thr=12, max=12, tthr2=5)
<br>
Processing luma with tthr2=0 and chroma with default values. Helps avoid unwanted artifacts in the luma channel (Y).
 input  = [[DGDecode|MPEG2Source]]("DotCrawl.d2v")
 chroma = input.checkmate()
 luma   = input.checkmate(tthr2=0)
 final  = luma.[[Merge|MergeChroma]](chroma)
- Suggested by [https://forum.doom9.org/showthread.php?p=1113007#post1113007 scharfis_brain] and it's also known as [https://forum.doom9.org/showpost.php?p=1470237&postcount=14 DeCrow()]
<br>
<br>

== External Links ==
*[http://www.aquilinestudios.org/avsfilters/dotcrawl.html#checkmate Scintilla's Guide] - Unofficial documentation
*[https://forum.doom9.org/showpost.php?p=1571520&postcount=20 Doom9 Forum] - Archived download.
*[https://forum.videohelp.com/threads/358820-Improving-Dilbert?p=2266862&viewfull=1#post2266862 VideoHelp] - Archived download.
<br>
<br>
-----------------------------------------------
'''Back to [[External_filters#Rainbow_.26_Dot_Crawl_Removal|External Filters]] &larr;'''
-----------------------------------------------