Finally had the chance of measuring the primaries on an iMac 27" 5K Retina (latest INTEL Corei9 processor, 1TB SSD, the works). The numbers don't lie, Apple is on the side of "P3", voluntarily distancing themselves from Adobe, as the following graph shows: https://1drv.ms/u/s!AkD78CVR1NBqkoJiT0F3iiQP-NYUjg?e=FNk075 I must confess I was pleasantly surprised/impressed by the quality of these panels. Apple must have quite a stringent quality assurance program wherever these babies are manufactured because the measured primaries were almost smack on the nose of P3 chromaticities. So much so that, for all intents and purposes, using the built-in ColorSync calibrator does the job. Except the gradation, which, in all honesty, the built-in calibrator can't do. This was easy to demonstrate to the Photoshop students who attended my class last night, by alternating between Apple's iMac 'built-in' profile and the one created with DisplayCAL/i1Pro2 @ native Luminance/WhitePoint, in SystemPreferences > Display > Color. Owners of these computers might want to consider investing into a colorimeter of some kind instead of resting on Apple's built-in calibrator? / Roger
It is useful to know where Adobe stands here. First of all, forget the name (Adobe RGB (1998) ) and believe it's something Adobe pushed or even proposed. In the first version of Photoshop 5.0, where ICC color management was introduced, the working space was called SMPTE-240M and it was as the name implies, was supposed to be a color space proposed by SMPTE. But Adobe got the chromaticity values off the web, one or two were wrong. They didn't realize this fact until after Photoshop 5.0 shipped when SMPTE told them of the mistake. Adobe changed the name to "Adobe RGB (1998)" because they of course could not call it SMPTE-240M; it wasn't that color space. So Adobe has no dog in the fight here about RGB working spaces despite having one with their name on it. It wasn't the intent. DCI-P3 is a newer proposed color space I believe, and based on Apple's users, and the fact the 'other' color space has 'Adobe' in the name, aimed for a different target (which isn't really that much of a difference). Andrew Rodney http://www.digitaldog.net/ <http://www.digitaldog.net/>
On Dec 3, 2019, at 1:58 PM, Roger Breton via colorsync-users <colorsync-users@lists.apple.com> wrote:
Finally had the chance of measuring the primaries on an iMac 27" 5K Retina (latest INTEL Corei9 processor, 1TB SSD, the works). The numbers don't lie, Apple is on the side of "P3", voluntarily distancing themselves from Adobe,
Andrew and Roger, Just to confuse, er, clarify things a bit more, here is what I gathered many months ago when looking for answers about "DCI P3" and which I wrote in one of my help manuals. -------------------------------------------- DCI P3 Theater The Digital Cinema Initiatives (DCI) is an entity created by motion picture studios whose purpose is to define specifications for Digital Cinema (Ref. 61). The DCI P3 RGB space has a gamut somewhat similar in gamut and primaries locations to the Adobe (1998) RGB space. There are two versions of this space which differ in their Illuminant; the DCI P3 Theater RGB space Illuminant has a Correlated Color Temperature (CCT) of 6300 K (expressed as 6300 K *) while the DCI P3 D65 RGB space has a D65 Illuminant. Both spaces are defined with a simple software-encoding (i.e. equation based) gamma of 2,6. There is also a variant of this space defined by Apple, called Display P3, which has a D65 Illuminant but with the gamma of the sRGB space. -------------------------------------------- Display P3 Defined by Apple, Display P3 has the same primaries as the DCI P3 Theater and DCI P3 D65 RGB spaces. It is defined with a D65 Illuminant (same as for DCI P3 D65) but its gamma is the detailed gamma defined for sRGB. This space has been used by Apple in some of its wide gamut displays. It is interesting to note that Apple selected the DCI primaries instead of the Adobe (1998) RGB primaries which have been used by other display manufacturers in order to bring their display closer to the specifications of Digital Cinema. However, because of its use of the sRGB detailed gamma, some conversion is nonetheless required if DCI P3 values are required. -------------------------------------------- I did not check recently if the Apple numbers have changed but I noticed they call their wide gamut displays "Wide color (P3)" for marleting purposes. Danny Pascale www.babelcolor.com On Tue, 3 Dec 2019 14:20:24 -0700, Andrew Rodney via colorsync-users <colorsync-users@lists.apple.com> wrote: (...)snip DCI-P3 is a newer proposed color space I believe, and based on Apple's users, and the fact the 'other' color space has 'Adobe' in the name, aimed for a different target (which isn't really that much of a difference). Andrew Rodney http://www.digitaldog.net/ > On Dec 3, 2019, at 1:58 PM, Roger Breton via colorsync-users wrote: > > Finally had the chance of measuring the primaries on an iMac 27" 5K Retina > (latest INTEL Corei9 processor, 1TB SSD, the works). The numbers don't lie, > Apple is on the side of "P3", voluntarily distancing themselves from Adobe, _______________________________________________
Danny Pascale via colorsync-users wrote:
DCI P3 Theater
There are two versions of this space which differ in their Illuminant; the DCI P3 Theater RGB space Illuminant has a Correlated Color Temperature (CCT) of 6300 K (expressed as 6300 K *)
AFAIK the white point is x,y 0.314, 0.351 which has a CCT close to 6300K, but is quite a way from either the black body or Daylight locus. Visually this is closest to 5903K on the Daylight locus at a distance of 12 DE2000. Presumably this white point corresponds to the color of a typical projection lamp. Cheers, Graeme Gill.
participants (4)
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Andrew Rodney
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Danny Pascale
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Graeme Gill
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graxx＠videotron.ca