Re: iMac 27" 5K Retina
Re: iMac 27" 5K Retina
- Subject: Re: iMac 27" 5K Retina
- From: Danny Pascale via colorsync-users <email@hidden>
- Date: Tue, 03 Dec 2019 20:01:05 -0500
- Feedback-id: dpascale@babelc
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
<email@hidden> 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,
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