Hello,
Thanks to the developers for the new colour balance rgb module. I am currently testing/discovering it.
I have a quick question :
I would like to neutralise the darker tone in an image (tree trunks that are a bit on the blue/purple side). With a colour picker I made a patch and would like to add a shadow lift. To find the opposite hue, if I understand things correctly, I subtract 180° from the hue found on the color picker. I think I should take the hue from the colour picker in LCh mode but the HSL gives me a hue too.
Am I correct in taking the hue from LCh (I am using the rec2020 working space in scene referred mode) ?
I’m not in my PC now, but I think that this didn’t change from the previous color balance module.
In the 4 ways tab, you have one color picker on each. If you use one of them, it selects you just the opposite color. I will put some captures in the evening if it’s not clear
Picker in the module is offset 180 by default. So it negates a cast. If you add or subtract 180 you actually have the hue of your cast…That is actually a good way then to boost that color say in midtones or whatever if that is needed.
The color space used for mapping the color balance RGB GUI with its internal RGB parameters is not HSL, nor Lch, but a kind of Yuv (Yrg) turned into polar coordinates, so the hue angles don’t match HSL nor Lch.
The reason is that Yrg space has a much more even repartition of Munsell hues in the linear space, meaning red, yellow, green, cyan, blue and magenta all take about 1/6th of the hue range, which is really not the case if you look at an HSL hue gradient (green swallows like 1/4, cyan barely 1/10th).
Thanks Aurélien, love the new filmic v5 by the way!
Pity I can’t access the angle with the colour picker then, I’ll look at the angle in HSL or Lch and eyeball it then!