P: scrolling to change brush sizes is very "twitchy"

[Arcterex]

With Lightroom 2015.7 on macOS Sierra (released today) the scrolling behaviour for changing brush sizes using the trackpad is very "twitchy".  It will jump from tiny to large with very small scroll movements.  All other scrolling in the OS as well as the rest of Lightroom is unaffected and works as normal.

Areas of issue:

 - Adjusting size of spot removal tool
 - Adjusting size of the adjustment brush

Unaffected:
 - Scrolling the grid view
 - Panning around the image with 2 fingers

I've tried with the GPU on and off.

Hardware:

15" 2014 MacBook Pro with 16G ram and SSD (65% full).  2.2Ghz i7.

Actual behaviour:
The best I can do is describe it as twitchy.  In the previous version using the scroll action (two fingers on the trackpad moving up and down) the brush sizes would adjust in a smooth and linear manner.  The current behaviour has the size jumping (smoothly, no going from big to small with nothing in the middle) very fast from big to small or back.  I can make more delicate size changes by moving my fingers *very* slowly on the trackpad.  

This feels very much like like someone has changed my mouse sensitivity to max, except it hasn't changed (default sensitivity in the accessibility trackpad options) and in the rest of the system the scrolling "feel" feels exactly the same as in the previous OS version.

[edw93820691]

I have the same problem with Apple's Magic Mouse. Changing the size of the spot removal tool is indeed "twitchy" when I slide my finger up and down the mouse. It wasn't that way in the previous version of CC LR.

[Ganesh GD]

@ed Wolpov,

Are you seeing this issue on macOS Sierra (only) or previous versions of OSX?

-Ganesh

[edw93820691]

Ganesh, although I'm now using Sierra, I believe this problem started with the latest update to LR (CC 2015.7). Both the LR update and the OS X update occurred at about the same time, so it's hard for me to know if it's Sierra or 2015.7. 

Also, can you do something about the Auto black & white mix in LR 2015.7 NOT defaulting to the ON state? Or give us a preference to change the default, like it was in the previous version of LR. 

And while I'm at it... how about giving us the option to change the color of the adjustment brush pins? Gray pins get lost in busy black & white images, I have to toggle them on and off with the H key so I can find them.

Thanks.

[colinjmcc]

I'm having the same problem, and I also can't be sure if this is an issue since updating to Sierra or since the 2015.7 update.

Using the trackpad to precisely and smoothly change the adjustment brush size is a really useful part of my workflow, so the current "twitchy" behaviour is a real issue for me.

Thanks!

[ragrawal]

Information regarding "Auto black & white mix " can be found here https://helpx.adobe.com/lightroom/kb/apply-auto-tone-mix-converting-black-white-preferences-removed....

[edw93820691]

Having an obvious "work around" is not a solution, it's the long way around.  How about bringing back the preference to allow me to chose the way I want LR to handle a simple default behavior. Removing preferences to force users into using extra keystrokes is just not acceptable, especially for black & white conversion. Your "assigned" black & white sliders are a poor choice for my creative work.

[edw93820691]

Mac OS 10.12.1 changes the twitchy (or super sensitive) behavior of the adjustment brush sizing to a slightly better feel, but it's now stepping in 1 unit increments, which is still annoying. The only way you can get a smoother adjustment is to place your cursor in the number block and slide the mouse (or trackpad pen) left or right.