Lightroom 2015 curves bug

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  • Problem
  • Updated 2 years ago
  • In Progress
  • (Edited)
Merged

This conversation has been merged. Please reference the main conversation: Lightroom CC 2015.8: Tone curve still broken in

I can't click and drag a curve point without it sticking as I drag. It's like the point hits an invisible wall especially as I drag to the right. Dragging the line as a whole from either corner of the panel is totally impossible. The point sticks and then all of a sudden it will jump half way up the panel.

I found this video (link below) on YouTube of others who are having the same issue.
The video description describes the problem well.
https://www.youtube.com/watch?v=GFE3e4kHzFo

I used to rely heavily on curves to make my major adjustments but now the panel is basically unusable. Very frustrating...
Please let me know if there's anything I can do to fix it.
Thanks!

Specs:
2013 Mac Pro
OS Sierra 10.12.1
Adobe Lightroom 2015.7
Same results whether using a mouse or trackpad.
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Zac Remboldt

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  • frustrated

Posted 2 years ago

  • 8
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Simon Chen, Principal Computer Scientist

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The issue should be fixed in the next Lightroom update. In the mean time, you can hold the shift key down to constrain the movement of the curve point up/down only.
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Zac Remboldt

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The shift fix is working for me. Thank you!
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Henrik Olsen

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Issue is not fixed. See example and description here.
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Zac Remboldt

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Just downloaded the latest update today. Lightroom 2015.8
The tone curve bug is still an issue...

I made a video showing the issue because a description could be easily misunderstood: https://www.youtube.com/watch?v=j3Kus4pEm5U&feature=youtu.be
(Edited)
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Alonso Bonifacio

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I started experiencing this issue after the 2015.6 update. I've been on the phone with Adobe numerous times about this. They kept promising to escalate the issue to engineering and a call back to no avail. Finally, 2 days ago I spoke to a senior person who told me they were able to reproduce the issue in different environments and have reported the bug. Hopefully we'll see a fix soon.

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Simon Chen, Principal Computer Scientist

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This "bug" is actually an as-designed Lightroom behavior. When the active curve point is moved too far beyond the allowed minimum or maximum end points along the x-axis (input value), Lightroom would snap and reset to a point curve with the dragged curve point removed. It is kind of a shortcut to allow one to discard the current point curve change (by quickly moving the mouse beyond the allowed range).

I agree this behavior is kind of unexpected from the customer point of view. Especially when dragging one of the two extreme end-points along the x-axis ([0,0],[255,255]), people tends to overshoot and intentionally drag the mouse to the left or to the right as much possible. Unfortunately, that would trigger this erractic behavior more often. This snap to reset behavior will be removed in the next Lightroom update. One can quickly remove a curve point by hovering over it and do a double click.
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Zac Remboldt

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No, I realize you can either double click points or drag them off of the curves panel to remove them.
That's not unexpected. The problem is that points, even if they're in the center of the panel, "stick" as I move my mouse slowly across the desk. Yesterday I slowly moved my mouse to the right halfway across my desk as the point I was trying to drag sat motionless.

I'm a longtime Photoshop and Lightroom user and I know since the latest Lightroom release that the panel isn't functioning as it should. The curves panel in PS still works perfectly.

The shift trick will get me through till the next update though.
Thanks for responding!
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Alan Harper

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Hi. I reported something similar, and Simon nicely pointed me to this conversation.
The shift key doesn't help me because I am trying to set the white and black levels, so I need to move the top-right and bottom-left points to the left and right, not up and down.
I was hoping that the alt/option key would help, but while it makes the response slower, it doesn't change the fundamental problem.
Zac, if you try your test again of moving your mouse halfway across your desktop, you will (I think) notice that when you let go of your mouse, the cursor is against the edge of your screen. The issue is (in part) that Adobe hides the cursor while you drag, and then when the cursor bumps into the edge of the screen, you have "run out of space to drag." If you make your window smaller or move it to the left, then you will have more room to the right to drag.
As I reported in my other posting, there is hysteresis in the algorithm -- the mapping of cursor position to dot-on-the-curve position depends on the history of dragging, so even if you were once able to put the dot where you want it, if you drag around a bit, eventually you will not be able to put the dot where you want it.
I just discovered a work-around, at least for my setup. I have two screens. If I move the Lightroom window onto the left screen, then I have oodles of space to the right in which to drag. And as long as I make sure that the Tone Curve panel is near the middle of the screen, I also have enough space above and below to drag.
I am not completely sure that Zac's complaint and mine are the same, but they are certainly related, and hopefully the next version of Lightroom will fix both.
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Alan Harper

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This reply was created from a merged topic originally titled Difficulty setting black and white levels in Tone Curve.

Alan removed this post as it seems redundant.
(Edited)

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