colorchannelmixer

Adjust video input frames by re-mixing color channels.

This filter modifies a color channel by adding the values associated to the other channels of the same pixels. For example if the value to modify is red, the output value will be:

red=red*rr + blue*rb + green*rg + alpha*ra

The filter accepts the following options:

'rr'

'rg'

'rb'

'ra'

Adjust contribution of input red, green, blue and alpha channels for output red channel. Default is 1 for rr, and 0 for rg, rb and ra.

'gr'

'gg'

'gb'

'ga'

Adjust contribution of input red, green, blue and alpha channels for output green channel. Default is 1 for gg, and 0 for gr, gb and ga.

'br'

'bg'

'bb'

'ba'

Adjust contribution of input red, green, blue and alpha channels for output blue channel. Default is 1 for bb, and 0 for br, bg and ba.

'ar'

'ag'

'ab'

'aa'

Adjust contribution of input red, green, blue and alpha channels for output alpha channel. Default is 1 for aa, and 0 for ar, ag and ab.

Allowed ranges for options are [-2.0, 2.0].

Command line examples

• Convert source to grayscale:

  colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3
  

• Simulate sepia tones:

  colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131