Hello: I've been trying to profile two new iMac Retinas using an i1Display Pro and software. Both have the desktop set to medium gray. Using the advanced mode, I set the display type to White LED, the white point to D65, the luminance to 100cd/m2. Following advice found on www.imagescience.com.au, I've set the contrast ratio to 250:1 rather than native as I'd like the two displays to match as closely as possible. I use the default profile settings except that I change the profile version from 4 to 2. I choose the largest patch set. I choose to adjust brightness and contrast rather than using the ADC option and am able to adjust to 99 or 100 cd/m2, although it's not always the same on both monitors. After running through the measurement process, on my latest attempt I get white point results of 6506, luminance of 99 cd/m2 and contrast ratio of 278:1 on one display and 6522, 100cd/m2 and 275:1 on the other. Is this about as close as I'll get? It seems pretty consistent to me, but visually one display looks to be a more neutral gray while the other seems "warmer" and appears to have a slight magenta cast. I've tried profiling with different white point settings, but the mismatch seems to occur regardless of the choice I make. More than one viewer has the same impression. Can I expect to get the screens to match? I don't have a sense whether the difference in the results I get is large enough to account for the visual differences one sees. When I make a sample print and view it under the lighting we use I get what I consider to be a good match between the screen and print - it actually looks pretty consistent on both screens. However, the computers are in a lab space used by students and the question does come up as to why the screens don't match. I'd appreciate whatever advice/information that anyone can offer. Bruce -- Bruce Bumbarger Library Conservator Magill Library - Haverford College 370 Lancaster Avenue Haverford, PA 19041 610-896-1165