Color Crosstalk

[Biju Damian]

how to use colourcrosstalk, its generating noise on image 🙃

[Andy Minuth]

As a start I recommend  moving only the 6 sliders on the left side. If one of you channels is very noisy e.g. the blue channel and you mix and amplify the blue channel into red and green then more noise is expected. 

[Margus Voll]

I would also see Vectroscope in conjuction of this tool to see what you manipulate.
I would assume when pushing some colors around axis to much then you also get all sorts of artifacts.

[Andy Minuth]

The ColourCrosstalk interface might not be our most intuitive one 😉 

Given the powerfulness of the tool it is quite robust compared to other more "complex" operations. The only issue is that if one of the channels is very noisy you should avoid amplifying the noise into other channels. 

But you can use this to your advantage: For example when you have a very noisy blue channel, increase the G in Blue Output. This will shift the colour palette towards a "simple" two-strip look and reduce the noise at the same time.

[Margus Voll]

What would represent it visually better ?

Refering to "The ColourCrosstalk interface might not be our most intuitive one"

[Andy Minuth]

I haven't thought this through, but something more geometrical would make sense I guess. Maybe something that represents the movements we can see in the histogram.

[Margus Voll]

This is exactly how i have imagined it as well. Thanks!