Photoshop: Adjustment Layer Slider Inaccuracy with Mouse Clicks

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  • Updated 7 years ago
  • (Edited)
I have trouble making accurate adjustments with the sliders in Photoshop CS5.1 Mac.

Take, for example, the contrast slider on the Brightness/Contrast adjustment layer: when I drag it to a new value (+2, for example) and release the mouse button, the value jumps backward to 0 and the marker moves slightly to the left. If I click the mouse again without moving it, the value jumps back to +2.

I've also experienced this issue in with the Memory Usage slider in the Preferences dialogue.

Both my OS and Photoshop have all the latest updates. I have tested this with two different optical mice, as well as the trackpad on my computer; all three cases yield the same problem. I've looked for a similar issue in Illustrator, but the sliders all seem to work fine there.

Thank you for your help.
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Jeremiah McCleary

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Posted 7 years ago

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Chris Cox

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Which OS?

And so far I can't repeat this at all -- every single value stays exactly where I let go of the mouse button.

Do you have a tablet, or a wireless mouse (known for their jitteryness)?
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Jeremiah McCleary

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Thanks for your speedy reply :)

I'm using Lion (10.7.2). No tablet or wireless mouse.

Seems like it might be related to the OS. A colleague of mine who uses a similar Macbook Pro, also with Lion, exhibits the same issue on his machine. I also checked with another colleague who is still running Snow Leopard, and hers does not have the problem.

When I looked more closely at my screen, I noticed something funny: while I am sliding the slider, the mouse pointer itself jitters side-to-side in its path (about 1 or 2px, relative to the slider head triangle). So, if I release the slider when the mouse pointer is "jittered" off center, the slider head jumps slightly and the value changes slightly.

Any ideas what could cause this?
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Jeremiah McCleary

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Thanks again.

If this helps duplicate the issue on your end, so far I've confirmed it on two Macbook Pros and one Mac Mini, all running Lion 10.7.2, and Photoshop 12.0 or 12.1.

Appreciate your time looking into this.
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Chris Cox

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Photoshop is a Cocoa app, while Bridge and Illustrator use the Carbon APIs.
And 10.7 does have several known video driver bugs affecting the cursor (especially on recent machines with the Intel HD3000 GPU).
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Jeremiah McCleary

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Alrighty. I do, indeed, have the HD3000 (along with a secondary Radeon 6770M).

Sounds like I just need to wait for Lion improvements, then. In the meantime, are there any resources you can point me to, that describe the video driver bugs you mentioned?

Thank you for all your help, Chris.
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Chris Cox

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This topic discusses the common cursor problems: http://feedback.photoshop.com/photosh...
Short version: we're all waiting on Apple to fix the driver software.

And until we can reproduce the cursor jitter you reported, we can't be sure it's the same problem (but I suspect it is).
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Jeremiah McCleary

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Ok. Thanks for the link. After reading a bit, it sounds like others are experiencing far worse issues than I am. I'm content to wait and see if an OS update fixes it.