yes, PS is usable right away, and the machine runs Yosemite (10.1.1) about the color space... I just changed it to that since I ran into the issue of color being completely off from the new machine to my old one - meaning a file that I edited in PS on new machine looked horrible on my old one, all washed out and "dead" instead of vibrant. I have not calibrated the new machine yet, had too many other issues going on with it to spend time on it (especially because I have to look for my calibrator and the software). My old machine was calibrated, although it has been a while, but the pictures came pretty much back the way they looked on the screen, so I did not bother changing anything... I figured it had to do with the color space... although I am still not that happy and hope that will change after the calibration. Although PS was also really slow while editing and now that I reduced the size to 8-bit, it works faster again, but still frustrating because this is a new machine with new and fast components.
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