The simplest way to decouple the orange-yellow-green channel for colour adjustment?

[dfcsd]

What’s the best way to independently target edit the colours orange, yellow and green in darktable? At the moment I make multiple instances of Color Equalizer with different offsets as a workaround, but things get worse when the distinction between, say, yellow and green is subtle - for example, sunlight hitting grass with a warmer white balance.

Here’s what happens when you reduce the saturation of yellow in Color Equalizer, to better showcase the problem:

The yellow flowers get desaturated, naturally. And the green grass too? And the yet “greener” grass in the shade as well?

[mino]

For photographs of plants and blooms I like to add a second instance of colour calibration with the “basic channel mixer” preset. Then gently reduce Green in the Red channel and Red in the Green channel.

This does of course not achieve precisely hat you are asking but might be a different approach for the problem you are trying to solve :-)!

Oh and colour zones sometimes allows for more precise selection of colours.

[123sg (Steven)]

I would use separate instances of colour balance RGB with parametric masks - this allows full control of the separation.

[thumper]

To target the hues that are normally considered yellow, you need to use the “orange” sliders with the node position control set to +15 degrees.

To target green, you need to use the green slider with the node position set to - 15 degrees

This is a quirk of how the color equalizer module was designed.

[thumper]

You can also post a play raw, and as a community we can test different methods of decoupling & editing yellow and green seperately.

[Terry (Terry Pinfold)]

Color zones works very similar to color equalizer but may give you more selection control as you set how many and where the nodes are placed. I would use in preference to color equalizer for this sort of image.