MaskTools/YV12Substract

YV12Subtract (clip1, clip2, int tol [, bool "widerange"])

Plugin: MaskTools

This filter computes the difference between the two clips. There are several ways of computing this difference, depending on the values of widerange and of tol.

• widerange = true : We compute the difference (n) between the two clips, and we return

r = 128 + 128 * pow(n/255, 1/tol). 

If tol < 0, instead of 1/tol we put 0.5 in the formula above.

• widerange = false (and)

• tol < 0 : we compute the absolute difference (n) between the two clips, and we return

r = n / 2 + 128.

• tol >= 0 : we compute the absolute difference (n) between the two clips, and we return 0 if n is lower than tol, n - tol else.

Defaults are: tol = -1 and widerange = false.

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