/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idi-p/12251750Aug 03, 2011
Aug 03, 2011
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After installing Lion, selections with the Rectangular Marquee Tool generally are reduced by one pixel when the mouse button is released. For example, dragging a 25x25px square results in a 24x25px selection.
It appears this issue was solved by a fix to the drivers released with Mac OS X 10.8.3 or later. Let us know if you're using a version of OS X 10.8.3 or later and still seeing this issue.
/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idc-p/12287467#M16439Mar 25, 2012
Mar 25, 2012
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The bugs are in Apple's video card drivers. Adobe is just attempting to work around the bugs, and that took significant time to develop and test.
When Apple fixes the bug in the drivers, that should solve the problem in all versions. But until then, we've tried to avoid the problem in the latest version of Photoshop.
/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idc-p/12281908#M10930Mar 25, 2012
Mar 25, 2012
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Very nice of you guys to take care of this.
However, a logical question would be -- are you guys planning any CS5/CS5.5 patches with these "workarounds".
/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idc-p/12281887#M10910Jan 09, 2013
Jan 09, 2013
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Update: We were able to reproduce this, thanks everyone for your help. We'll investigate a fix. Somehow this was reintroduced with the latest patch, it doesn't occur in 13.0.
/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idc-p/12282038#M11060Feb 18, 2013
Feb 18, 2013
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Hey Michael
Sounds like you're able to isolate the bug. It'd be decent if you could roll out a patch for CS 5-5.5 users who purchased an upgrade from 4 only to find the bug introduced! The whole suite isn't exactly cheap! I can't see myself upgrading for some time. Besides, CS5.5 is not all that old. Surely Adobe value their customers enough to offer more than minimum support for their products.
/t5/photoshop-ecosystem-bugs/p-inaccurate-selections-with-radeon-graphics-cards-on-mac-os/idc-p/12282029#M11051Aug 16, 2013
Aug 16, 2013
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Is this fixed in the CC release? If not, does anyone know if there is an older version with which this (and this http://feedback.photoshop.com/photosh...) does not happen?
(I'm thinking about canceling my CC subscription and buying a used copy of CS4, if these bugs do not exist in that version of PS?)
Adobe! You are KILLING me with this bug! Stop spending time on conferences and fix your product. Also the movement of dragging the marquee outside the window is SO SLOW. How is it possible that Photoshop get worse with each new version?? Shouldn't it get progressively better?
It does get significantly better with each version. What, specifically are you seeing?
Also, the radeon selection problem is due to a bug in the driver, which we attempted to work around. Unfortunately different versions of the driver have different behaviors. For instance, I'm not seeing this in 10.7.5 with a Radeon 4670 or 7950.
Here's an update with my modern hardware. I'm running Photoshop 13.0.5 x64 on a Mid 2013 MacBook Air with an Intel HD Graphics 5000 GPU. With "Use Graphics Processor" OFF in Preferences under Performance (which makes a difference), I'm seeing these behaviors:
When I start to make a selection from top-left to bottom-right of a square, the top edge of the "potential" marquee appears to be 1 pixel above where the origin of my selection is, though when I release the mouse button to confirm my selection, the finished marquee moves down 1 pixel and lands on the top edge I intended to include in my selection. So, in this case, the end result is what I wanted given my starting coordinates, but it's not what it looked like I was going to get while I was making the selection.
Also while doing the above operation, the right edge of the "potential" marquee is 1 pixel to the right of the vertical line of crosshair cursor. In contrast, the bottom edge of the "potential" marquee is perfectly aligned with the horizontal line of the crosshair cursor. In this aspect, to get my selection to be what I intend, I have to place the right edge of the marquee on the vertical column of pixels I'd like to include. That's consistent with the Photoshop marquee I know and love, but if I let the marquee go using the crosshair, my selection would be 1 pixel too wide to the right.
When I turn GPU usage back on in Preferences and restart Photoshop, the same test exhibits the same 1 pixel right-side inaccuracy as my second bullet above, as well as the same behavior on the bottom edge: The marquee edge sits 1 pixel below the horizontal line of the crosshair cursor.
One other thing I noticed while doing these tests is that the width of the individual "potential" marquee segments is different depending on the state of the GPU usage; Having the GPU on makes the black and white marquee segments about double the length. It's an odd inconsistency that makes it surprisingly easy to find out whether or not GPU acceleration is enabled. I prefer the shorter segments, but if selections were accurate in one state or another, I'd stick to that state!
Sorry for being so wordy, but I tried to be very specific. Let me know if you want any more details or experiments done.
With the GPU acceleration off (and restarting Photoshop), you're just using plain OS blit routines - anything that is offset is due to the OS or video card drivers.
Yes, the drawing is a little different with the GPU versus non-GPU, due to a number of rather obscure factors.
And yes, being specific about your system and what you're seeing helps.
Sounds to me that (one of the) the conclusion(s) here is that Photoshop does not and will not run properly on a Macbook Air (presumably amongst other machines).
If Adobe will just come out and make this statement then we can all make an informed decision about changing our hardware or software, and get on with our lives.
Couldn't we just get a fix placed in settings to correct the ant-march display by X by Y pixels? I've had this same problem since CS 3 (all on PC). The error's consistent and being able to adjust this in settings seems to make the most sense.
I meant it's been consistent for me. With a parameter in the settings to give users control of this display error, we could just adjust it ourselves, no? Something like:
Adjust Marquee
Horizontal _______
+ up, - down
Vertical _______
+ left, - right
Thank you, by the way, for the super prompt response. 🙂
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