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Re: [OM] cobalt profiles

Subject: Re: [OM] cobalt profiles
From: "tOM Trottier" <tom@xxxxxxxxxxxxx>
Date: Sat, 19 Mar 2022 02:23:52 -0400
On  Friday, March 18, 2022 at 14:17 re:
        Re: [OM] cobalt profiles …
        Moose <olympus@xxxxxxxxxxxxxxxxx>said:

>On 3/14/2022 7:16 PM, Wayne Shumaker wrote:
… 

>> There are times when the adobe curve can create problems where you can no 
>> longer pull it down. To quote the
>>article: 

>> "We are therefore in the unfortunate situation of being able to photograph a 
>> high-contrast scene up to 14 stops, 
>>but not being able to represent it as an output in a credible way for our 
>>senses. 

Why not? Maybe not on paper, but on an OLED 
display or a transparency.

"Dolby Vision includes the PQ  transfer 
function, a wide-gamut colorspace (ITU-R Rec. 
BT.2020 in YCBCR or IPTPQc2 ), up to 8K 
resolution, and for some profiles (FEL) up to 
12-bit. It can encode mastering display 
colorimetry information using static metadata 
(SMPTE ST 2086) and also provide dynamic 
metadata (SMPTE ST 2094-10, Dolby format) 
for each scene or frame.[14] This dynamic 
metadata or Dynamic HDR allows adjusting of 
brightness and contrast (in reality, the tone 
curve) on the scene by scene or even frame by 
frame bases as and when required and adjusts 
it many times during the video/movie.[citation needed] 
It is considered to be future-proof.[15]"
— https://en.wikipedia.org/wiki/Dolby_Vision
(OLED displays have the advantage of total 
blackness pixels, subject to any reflection or 
neighbourhood pixel bleed)
12 bits is 12 stops. Add dynamic HDR by pixel 
and you are only limited by the hardware, 
presumably up to 24 bits or 24 stops.

See also 
https://www.rtings.com/monitor/tests/picture
-quality/contrast-ratio

— tom
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                                 tOM Trottier +1 613 860-6633 tOM@xxxxxxxxxxxxx 
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