P: Inaccurate selections with Radeon graphics cards on Mac OS

I have this EXACT same problem. Marquee selections slightly off after unclick via trackpad or mouse (Bluetooth & USB).

Also when dragging a Curves point is generally off 1px.

VERY AGGRAVATING

2011 MBP 2.2GHz i7
OSX 10.7.2
AMD Radeon 6750M
CS5 Photoshop 12.0.4

Here are some screen shots to better illustrate the OpenGL problem with many Macs. The selection marquee is offset 1 pixel right and 1 pixel down while drawing. Once the mouse is released, the marquee snaps in position on the horizontal axis, but remains off in the vertical axis.
Changing the OpenGL options has no effect on this behavior.

2011 3.4GHz i7 iMac with AMD Radeon HD 6970M
OS X Lion 10.7.1
Photoshop CS 5.1

When I make a selection, the selection displays one pixel off from where it should be. As seen in the screenshot below the selection is actually flush to the right edge of the canvas even though it displays 1px off. If I pan the screen around the gap goes away in some spots which leads me to believe this is some sort of compatibility issue between certain Radeon cards and Photoshop.

I have searched around and it would seem many people have experienced this issue. All of my software is up to date. If I turn off OpenGL then this display issue goes away, however this is not a fix. A brand new top of the line iMac should have no problem running Photoshop. The problem also does not seem to be isolated to CS 5.1 or OS X 10.7.1.



For more details, see threads: http://forums.adobe.com/message/2990758 and http://forums.adobe.com/message/39544... on the Adobe forums.

We're still working with Apple to try and get the video driver bugs fixed -- there's just an awful lot of them in 10.7.

Note.. even the marquee isn't rendering correctly in this zoomed view. See the pixel of gray across the top? That should be the "marching ants".

This is extremely frustrating. I used to be able to zip around with great accuracy (and always touted the wonderful "feel" of adobe products because of the pixel accuracy - when drawing bezier curves, for example). I do pixel-perfect work and this is driving me nuts. :(

Latest MacBook Pro here and one that's about 2 years old at home. Same issues.

Not just selection marquee either. Also crop tool and shape layer tools. It's killing me.

Me too. It's as though 1px = 1.138523 px or something. Simply brutal. 😞

I'm not sure if this is related, but the eyedropper tool for me exhibits a strange pixel shift at times in Lion, in both Photoshop CS5 and CS5.1. Sometimes, the preview circle will shift one pixel from where the cursor is, and show the color of that pixel instead. When I let go of the mouse button, the color that the cursor is actually on does get selected though. Sometimes it works fine, sometimes it looks like it shifts the circle over to the right, sometimes one pixel down, sometimes down and to the right. I can see the circle actually move right after it appears. I took a screen recording of this happening, the odd thing is that although I was 100% sure my cursor was on the rightmost edge of the blue square, in the recording, it shows it on the white part to the right of the square. You can see when the mouse is released though, that blue is the foreground color, not white like the circle shows should be. This never happened in Snow Leopard.

http://intendo.net/files/ScreenRec...