Re: profiling iMac Retina displays running OS X 10.10
Re: profiling iMac Retina displays running OS X 10.10
- Subject: Re: profiling iMac Retina displays running OS X 10.10
- From: Spinnaker Photo Imaging Center <email@hidden>
- Date: Tue, 24 Feb 2015 10:37:10 -0800
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 <email@hidden> 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
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