I own the CS5 master collection. I recently purchased a new Retina Macbook Pro. 15" 16gb RAM, 512gb flash, 2Gb Nvidia. For some reason, my crystal clear dslr photos are appearing blurry when opened in photoshop. In iPhoto they look sharp. Any ideas? Any help would be much appreciated. I'm losing my mind over here!
If you imported your image files into iPhoto, Photoshop cannot see the original files and is showing you just the tiny embedded JPEG thumbnail. Blame iPhoto.
iPhoto buries your images in its entrails as packages no other software can get at. What you need to do is to EXPORT your images first into some folder Photoshop and other software can see. You have to do this from within iPhoto itself after launching that d@mned Apple application.
On another subject, CS5 does not have the necessary features to accommodate Retina screens.