Re: colorsync-users Digest, Vol 21, Issue 1
Re: colorsync-users Digest, Vol 21, Issue 1
- Subject: Re: colorsync-users Digest, Vol 21, Issue 1
- From: Scott Martin via colorsync-users <email@hidden>
- Date: Sat, 20 Jan 2024 13:25:50 -0600
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Thanks for this Steve - I appreciate your perspective. I also like the
"beginning of the workflow” concept.
Scott Martin
www.on-sight.com
Imaging Science for Art
> On Jan 19, 2024, at 2:01 PM, Steve Upton <email@hidden> wrote:
>
>
>> On Jan 11, 2024, at 10:05 AM, Scott Martin via colorsync-users
>> <email@hidden> wrote:
>> ...
>> And yes, “over-range” lab values are real and needed! I photographed some
>> artwork yesterday that used over-range vales...
>
> Scott,
>
> I understand the desire to have over-ranged Lab values but I think the idea
> has challenges in today's color architecture:
>
> - The ICC PCS's (profile connection space for those unfamiliar) a* and b*
> dimensions are restricted to -128 -> 127
>
> - This means all ICC profiles in the workflow, including display profiles,
> are restricted to the same ranges
>
> So while I see the desire to be able to enter over-ranged values, there are
> no ICC profiles that have any LUT entries for dealing with the obvious gamut
> mapping that is going to have to occur... I'm curious how they are mapped
> today. I guess it's a linear process using DNG definitions
>
> I also see the value in Lightroom allowing such over ranges as it's a
> "beginning of the workflow" tool that shows photographers their source color
> values AND maps them into the restrictions of the rest of the workflow. I can
> see wanting Photoshop to be able to do the same thing but it seems much
> riskier as users might expect (and use) those over ranges for other purposes
> than just importing photographs that might contain them in their DNG-defined
> spaces
>
> regards,
>
> Steve
>
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| References: | |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: "Remington, David via colorsync-users" <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Andrew Rodney via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Scott Martin via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: John Castronovo via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Scott Martin via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Martin Orpen via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Scott Martin via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Andrew Rodney via colorsync-users <email@hidden>) |
| | >Re: colorsync-users Digest, Vol 21, Issue 1 (From: Scott Martin via colorsync-users <email@hidden>) |