Subtract: Difference between revisions
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Show the difference between two clips. Where the clips are equal, the output is 50% grey. | Show the difference between two clips. Where the clips are equal, the output is 50% grey.<br> | ||
See [[filters with multiple input clips]] for the resulting [[Clip_properties|clip properties]]. | |||
== Syntax == | ==== Syntax ==== | ||
{{Template:FuncDef|Subtract(clip ''clip1'', clip ''clip2'')}} | {{Template:FuncDef|Subtract(clip ''clip1'', clip ''clip2'')}} | ||
Latest revision as of 16:33, 27 February 2016
Show the difference between two clips. Where the clips are equal, the output is 50% grey.
See filters with multiple input clips for the resulting clip properties.
Syntax
Subtract(clip clip1, clip clip2)
Examples
Show the difference between two clips, and make the difference blatantly obvious:
Subtract(A, B).Levels(65, 1, 255-64, 0, 255, coring=false)
Show the difference between adjacent frames:
Subtract(A, A.Trim(1, 0))
About offset of luma range
For YUV formats the valid Y range is 16-235, and Subtract takes this into account. This means that the following script
Subtract(A, B)
...will result in a "50% grey" clip with luma=126.
If you require a mathematically correct subtract function for 0-255 RGB or YUV data, use Overlay:
Overlay(A, B, mode="difference", pc_range=false)
...which results in a "50% grey" clip with luma=128.
