May 2015 - colorsync-users - lists.apple.com

Re: Colorsync-users Digest, Vol 12, Issue 71
by Louis Dery 29 May '15

29 May '15

Hi Andrew, I think they mean "pleasing color" accuracy to sRGB. :-) that is what I understand ;-( Louis Dery www.couleur911.com > > ------------------------------ > > Message: 2 > Date: Tue, 26 May 2015 08:14:14 -0600 > From: Andrew Rodney <andrew(a)digitaldog.net> > To: "'colorsync-users?lists.apple.com' List" > <colorsync-users(a)lists.apple.com> > Subject: iMac calibration? > Message-ID: <E686C83E-BC27-432F-A8FE-62E045682645(a)digitaldog.net> > Content-Type: text/plain; charset=utf-8 > > Can someone explain what Apple is trying to tell it's customer with respect to display calibraiton here? > ---- > http://www.apple.com/imac/design/ > Individually calibrated for true-to-life color. > None of these innovations would matter much if the iMac display didn’t deliver vivid, true-to-life color. Which is why we put every display through an exacting color-calibration process using state-of-the-art spectroradiometers. This equipment is tuned to meet color standards recognized around the world for precision and accuracy. > ---- > Aside from the marketing hype starting with calibrated for true-to-life color, what are they calibrating for, and what color standards recognized around the world for precision and accuracy are they talking about? > > Andrew Rodney > http://www.digitaldog.net/ > > > ------------------------------ > > _______________________________________________ > Colorsync-users mailing list > Colorsync-users(a)lists.apple.com > https://lists.apple.com/mailman/listinfo/colorsync-users > > End of Colorsync-users Digest, Vol 12, Issue 71 > ***********************************************

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Re: I1Profiler 1.6.1 Patch Viewer
by Andrew Rodney 27 May '15

27 May '15

> On Apr 24, 2015, at 3:37 PM, Terence Wyse <wyseconsul(a)icloud.com> wrote: > > I appreciate some of the changes that have been made and the new features….but this release shouldn’t have gotten out the door. Meanwhile, I'm told there are both outside testers and a QE team that looked this build over. Should be all fixed, in about 9 months <g>. Andrew Rodney http://www.digitaldog.net/

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Re: iMac calibration
by Paul Sherfield 27 May '15

27 May '15

Bet it is still an sRGB gamut. Paul Sherfield The Missing Horse Consultancy Ltd 07899 906385 www.missinghorsecons.co.uk Follow us on: twitter.com/missinghorse >

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Re: iMac calibration? (Andrew Rodney)
by vaclavicek 26 May '15

26 May '15

Hi Andrew, let me say some words to your: ----------------------------------------------------- Can someone explain what Apple is trying to tell it's customer with respect to display calibraiton here? ---- http://www.apple.com/imac/design/ Individually calibrated for true-to-life color. None of these innovations would matter much if the iMac display didn¹t deliver vivid, true-to-life color. Which is why we put every display through an exacting color-calibration process using state-of-the-art spectroradiometers. This equipment is tuned to meet color standards recognized around the world for precision and accuracy. ---- Aside from the marketing hype starting with calibrated for true-to-life color, what are they calibrating for, and what color standards recognized around the world for precision and accuracy are they talking about? Andrew Rodney ----------------------------------------------------- In our digital era most of modern electronic-devices are controlled by more or less complicated firmware or something like "operating system" and typical reason and result of that the devices is able to present other than native values of hardware to users. In case of modern professional displays the internal "color-computer" can completely transform data from input to another colorspace with 3D-LookUp-Tables. And whats important the user NEVER can see REAL native values of hardware if buy some profi-monitor like one from Eizo ColorEdge serie! Every value you can see on LCD is result of internal computation, correction-tables and factory-calibrations. Even values of primary R-G-B colors aren¹t native but are corrected for every unit to be virtualy same of all serie of one model. We can just talk about "permanent emulation" of factory targeted colorspace for specific model. /we can not expect this technology at low-price mass-production of course while they use the same correction-tables for 1000 units of LCDs or more/ Note: the more bigger display the more fluctuation of paremeters so more sw-corrections are needed - for example its not possible to produce 27-inch displays in profi-graphic class without very intensive corrections and calibrations on factory side. If we want to produce monitors with whitepoint 6500 K with 100 K tolerance we need measure and calibrate every unit individualy. Now Apple only want to tell us we can expect stable and uniform color reproduction of many units of new iMacs even in 27-inch size. Note: by my personal experience with several units I can say the displays in iMacs produced in last 1 or 2 years are significantly higher level than before in different aspects (I mean uniformity, brightness-regulation, gamma-correction, general factory-calibration). Maybe someone who is in connection with Apple can say something more about changes in iMac production (its not me :-). Radim Vaclavicek

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Re: Why so arcane?
by David Wollmann 26 May '15

26 May '15

On May 25, 2015, at 1:00 PM, Grant Symon wrote: > Building an automator action offers me the ‘Apply ColorSync Profile to Images’ action. > > Apply? Okay, what do Apple actually mean by this? Embed, Assign, Apply? So I look up the ColorSync Utility’s Help and I find this explanation under ‘Modify Image Colors': Hi Grant, This is my take on the terms you asked about. Match To … should behave the same as Convert To … it will convert from one profile to another profile and it will preserve the appearance. It should Match from one device to another because you are changing the numbers to represent color on the new device. It should then tag the file with the new profile. Assign Profile … This will assign a new profile. This will change the appearance because you are redefining what the numbers means - the internal Lab or XYZ numbers, the CMYK and RGB numbers stay the same. Apply Profile … This should work like soft proofing. It should apply the effects of the selected profile to the display but it will not reassign a new profile nor will it convert to a new profile. Open a tiff file in ColorSync Utility and hover over the popup at the lower left and you will find Apple’s definitions for those functions. I find though that ColorSync Utility almost always does soft proofing, so for that application Apply Profile seems redundant. My preference is for more conventional terms such as, Convert To, and Soft Proof. David Wollmann

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Why so arcane?
by Grant Symon 26 May '15

26 May '15

Hi, I have a pretty good understanding of how color works on computers, however, trying to do something simple, like automating colour space conversion and file type has brought me back to the same old questions I had years and years ago, about what Apple’s colorsync technologies are actually doing. Building an automator action offers me the ‘Apply ColorSync Profile to Images’ action. Apply? Okay, what do Apple actually mean by this? Embed, Assign, Apply? So I look up the ColorSync Utility’s Help and I find this explanation under ‘Modify Image Colors': When the file opens, click the leftmost pop-up menu at the bottom of the window, then choose an option. Match to Profile: Changes the colors in an image to match the ColorSync profile. ColorSync Utility modifies the pixels in the image to match the new color model and ColorSync profile, then assigns the new ColorSync profile to it. Assign Profile: Assigns the ColorSync profile for an image. ColorSync Utility does not modify the image saved in the file; it changes only the ColorSync profile for the image. Apply Profile: ColorSync Utility modifies the pixels in the image to match the new color model and ColorSync profile, then assigns the image’s original ColorSync profile to it. As you can see, the explanations of Match and Apply are almost identical, except Match appears to say the same thing twice. Perhaps it really, really, does it? Assuming that Apple’s engineers know what they’re talking about, could someone please explain to me what the difference is between Match and Apply? I ask this specifically, because the Automator action I mentioned earlier, specifically uses the word ‘Apply’. It also has a checkbox, which I’ve tried to google to no avail in the past and just tried again now. It says; ‘Preserve Original Color Space’. It seems that no one on the internet actually knows what this checkbox means. There is speculation, but nothing that I can find that clearly states what it does. What I’d really like to know, is whether or not I can use this Automator action to properly Match from the embedded profile, to a new one, for example, from AdobeRGB to sRGB. Can anyone clarify these points for me? Much thanks for any help, Grant

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2015 is the International Year of Light
by Chris Murphy 12 May '15

12 May '15

On 20 December 2013, the UN General Assembly 68th Session proclaimed 2015 as the International Year of Light and Light-based Technologies (IYL 2015)... Started this week! http://www.light2015.org/Home.html -- Chris Murphy

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Reasonably accurate predictions of spot colors solids and tints
by Roger Breton 07 May '15

07 May '15

Hi folks, I was reading about the < ICC Labs > project for v5 ICC profiles, which will feature new spectral matching. But I am confronted with real world proofing applications today where I would like to use good colorimetric predictions of spot colors mixing. Does such an application exist? To your knowledge? Ideally, I'd like to proof artwork that mix and match process and colors. Best / Roger

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Re: Colorsync-users Digest, Vol 12, Issue 67
by Millers' Photography L.L.C. 07 May '15

07 May '15

Ben, I use i1Profiler with the version D of i1 Pro. Can this application do it? I am not literate in this area of color. D Millers’ Photography L.L.C, David B. Miller, member dba Spinnaker Photo Imaging Center 3809 Alabama Street Bellingham, WA. 98226-4585 360 739 2826 david(a)spinnakerphotoimagingcenter.com > On May 7, 2015, at 12:00 PM, colorsync-users-request(a)lists.apple.com wrote: > > > On May 7, 2015, at 9:44 AM, Spinnaker Photo Imaging Center <spinnakerphotoimagingcenter(a)dnmillerphoto.com <mailto:spinnakerphotoimagingcenter@dnmillerphoto.com>> wrote: > >> Ben, how would I have the software to read the home made patch? > > Any instrument is going to ship with software that can do spot measurements. Whether or not that software can also do input profiling with arbitrary charts is another question...but the good news is that Argyll is free, at least matches and generally surpasses the commercial offerings in terms of quality, and supports pretty much any type of profiling or workflow or whatever.

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Really small color checker?
by Dimitri Katsaros 07 May '15

07 May '15

Hey all, I am shooting macro, later down the line possibly getting into micro, and was wondering if there exists a color checker card the size of a stamp or smaller. If not, are there any other solutions for getting color correct images at this small a subject size? Thank you Dimitri Katsaros

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