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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