+- MacResource (https://forums.macresource.com)
+-- Forum: My Category (https://forums.macresource.com/forumdisplay.php?fid=1)
+--- Forum: Tips and Deals (https://forums.macresource.com/forumdisplay.php?fid=3)
+--- Thread: Cannot calibrate Retina iMac when booted from external Mojave drive (/showthread.php?tid=296077)
Cannot calibrate Retina iMac when booted from external Mojave drive - steve... - 04-29-2025
2015 iMac currently running Mojave on the internal drive. The retina display looks great. But when I boot from an external ssd drive also running Mojave, I cannot get a good image on the retina display.
Tried calibrating with system preferences > displays > color > calibrate and also Spyder Pro color calibrator. Nothing seems to help. What caught my attention was the faint lines separating the days in Calendar and also the subtle gray/white backgroud lines here on the forum. When booted from the external, they're all washed out. Any ideas? TIA
Re: Cannot calibrate Retina iMac when booted from external Mojave drive - PeterW - 04-29-2025
Are all the Display prefs the same in both copies of the OS?
Re: Cannot calibrate Retina iMac when booted from external Mojave drive - steve... - 04-30-2025
Yes, as far as I can tell, they're the same. I even copied the profile over with no change. I had an external Monterey drive running for a few years with no problems. My plan was to upgrade the internal to Monterey when the external Mojave drive was ready.