P: Inaccurate selections with Radeon graphics cards on Mac OS

Any progress on this? It's beyond frustrating at this point!

Actually the eye dropper isn't new. Several people above has mentioned it.

All that you describe is exactly what I'm experiencing MANY times per day on a daily basis. It's infuriating. 😞

Exactly!! I have to try 4 or 5 times, often, to get the marquee or shape later to draw to the pixel size when the mouse button is released. If you watch the dimensions in the Info box, you will see this for sure. It's incredibly annoying.

Something new: when using the eye dropper, when you drag over an area with the mouse down, watching the color selection change, when you let go of the button, it often jumps to a neighboring pixel. This is most notable on edges. Say you want to sample a color on the very edge of a gradient. It often grabs a pixel near by.

Come on guys. Let's get this working.

I believe there's a regression in Photoshop CS5 (and maybe CS4?) in that at 100% zoom, attempting to marquee an exact rectangle will often result in the marquee being off by a pixel in either dimension. Extremely frustrating. I'm using a standard Apple wired mouse and in any other application, I can marquee with single pixel accuracy. Only workaround that exists (which hurts productivity) is to zoom in at least 200% (but 300% or higher works even better).

Specific example: Have an image of say 1020 by 768 at 100% zoom. Attempt to marquee a middle area of 200 by 100. When the mouse is still down, the Info inspector will show you that the area is indeed 200 by 100. Releasing the mouse button will then often end up giving you a marquee of 199 by 100, 200 by 99, etc.

Experiencing the same here with the selection tool, until I disabled OpenGL Drawing and relaunched Photoshop. I still see that sometimes when I drag, the marching ants no longer line up perfectly with the cursor. When I release the mouse, the selection is based on where the cursor is. I guess this is what Michael meant above. Thanks.

MacBook Pro
AMD Radeon HD 6770M 1024MB
Mac OS X Lion 10.7.2

You are right. I have just submitted the bug via Apples Feedback and encourages everyone else with the problem to do the same:
http://www.apple.com/feedback/

I just heard from two of my friends that they have the same problem on a brand new iMac bought after Lion was released, a 1,5 year old iMac i7 and my own iMac from 2007.

On my Mac it does not make any difference if I turn off the OpenGL settings on the performance tab in Photoshops preferences.

Yes, we do. But Apple really needs to hear it from end users.

By the way, I'm just wondering -- do Adobe developers report all these issues to Apple? I mean, Mac has reputation of a preferred platform for all kinds of designers, so I was wondering if Apple is aware of this platform's conflicts with Adobe products.

I have the exact same problem on my iMac with OSX 10.7.2 and Photoshop CS5 v12.1. Immensely annoying and time consuming.

Apple, hurry up!