I’ve noticed that the curves tool in custom mode has changed in behaviour. In V5.4 stable release, it behaves like any other curves adjustment tool I’ve used, most notably Photoshop. When I place a control point in the shadow region (<50%) and raise it, the upper section of the curve gets pushed upwards a lot and one has to watch out for highlights getting clipped and usually will have to add another control point in the highlight section to roll off the curve there.
I’m also playing with one of the more recent developmental versions, and when doing the same, the upper section of the curve hardly moves at all when I push up the shadows. The same is true in the opposite direction for a control point in the highlights section.
Just wondering what’s going on and I’m not sure how to really feel about this change yet. On the face of it I dislike the new curves behaviour almost all of the time, such as when placing multiple control points which results in kinks compared to the previous way it used to work. For instance, a simple shadow compression and midtone contrast boost with both methods. Please refer to the attached screenshot. The old style has a smooth gradual change in the gradient from less than one to more than one. The section between the two added control points is nice and smooth.
The new style has the gradient change quite drastically within those two points. To achieve the same shape, a third point must be added to raise the highlights, but upon closer inspection, the kink in the shadows still somewhat remains.
If there are any advantages to this new curves behaviour, I would like to learn. I do notice that when adding a new control point and moving it, the entire curve (especially if held down by other control points) moves less than the old curves design. Perhaps the intention is so that more precise/targeted adjustments can be made with fewer overall control points?