[LR 4.1] Graduated filter bug

Question

Hi,
I have an image horizontally divided in two parts : 2/3 (sky) and 1/3 (ground). I have created 2 graduated filters, each fully and exactly covering one part of the image. I created the biggest one (2/3) first. The two graduated filters do not overlap.
When I apply effects to the first graduated filter, everything happens as expected : any change made to the exposure, saturation or whatever parameter only affects the area covered by the graduated filter.
When I (try to) apply effects to the second graduated filter (1/3 - covering the rest of the image), any change is applied to the whole image, as if the graduated filter was covering all the image.
It's too severe a bug to imagine that nobody noticed it until now. On the other hand, this behavior is not logical.
It's not specific to a particular image. I can reproduce this on any image.
Did I miss something obvious?
Anyone already seen this ?
Thanks in advance.

Answer 1

So while I admit that it's not a bug "per se", I realize that something is missing : the ability to apply the graduated effect in the reverse direction. Which is not the same as flipping the filter upside down.
Either I am missing something, or flipping the filter upside down (or dragging upwards from the start) is exactly what you need - you only have to apply the inverse value of the effect you want to use.
Example: You want to make the lower half of the image <i>brighter</i> (as opposed to the common case to make the upper half [sky] darker): Set exposure to a <i>positive</i> value and then drag upwards.
But perhaps I didn't understand your point correctly...
EDIT: Ok, perhaps now I understood: I looked again at your question: "So what if I want to apply say, a low saturation from a point located below the middle of the image, progressively returning to the normal saturation at the bottom of the image, without affecting the upper part of this image?": So you want to "reverse" the filter effect in such a way that it:
immediately (abruptly) starts at full strenght at line #1
gradually dropping to zero strengts at line #2
Is that correct? If it is: No, that is not directly possible. Probably because the graduated filter are modelled after real-world filters, which cannot do such things (AFAIK). You have to use two filters together to get the desired effect, just like trshaner described above. Here is a quickly done example - hopefully this is exactly what you like to achive:
For this example, I used a very thin GF (dragged upwards) at the line where the saturation sharply drops (set to -100) and a larger GF (also dragged upwards) spanning from the bottom of the picture to the first GF, with saturation +100, so it gradually counteracts the first GF.