Bruce, please give directions directly to the imagescience instructions you have in mind. Cheers David David B. Miller, Pharm. D. member Millers' Photography L.L.C. dba Spinnaker Photo Imaging Center Bellingham, WA www.spinnakerphotoimagingcenter.com 360 739 2826
On Feb 24, 2015, at 8:40 AM, Bruce Bumbarger <bbumbarg@haverford.edu> wrote:
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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/spinnakerphotoimagin...
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