Re: Designers, Color Management, and Xrite , some thoughts and comments.
Re: Designers, Color Management, and Xrite , some thoughts and comments.
- Subject: Re: Designers, Color Management, and Xrite , some thoughts and comments.
- From: "email@hidden" <email@hidden>
- Date: Sun, 20 Apr 2008 13:03:08 -0400
Hi Uli,
This document from apple highlights some of the decisions that Final Cut
Pro makes based upon input media.
http://docs.info.apple.com/article.html?artnum=93794
Here, apple's own words, is a description of the mess.
Poynton's article on gamma is a good one to review
http://www.poynton.com/PDFs/GammaFAQ.pdf
The choice of the gamma 2.2 is not a simply based upon the native
response of a CRT. That was one important, but not sufficient reason.
Regards,
Tom
Uli Zappe wrote:
Hi Tom,
There are very good technical reasons for gamma 2.2 as a native
response. These reasons long pre-date the Mac and PC battle.
But what you describe below (HDTV specs) clearly occurred after the
Mac-PC battle?!?
Anyway, I think video standards that date back to the days of the CRT
are clearly influenced by this technology, which did have a high
native gamma (even higher than 2.2, IIRC). You used CRTs for videos,
not printers, and you watched videos on ancient things called "TV
sets" that had no computational intelligence built in. So I can see
how 2.2 was a reasonable choice here.
But this is history. LCDs don't have any inherent gamma; they are
constructed to emulate one. Given the CRT model and the prevalence of
PCs, they choose to emulate 2.2.
These things happen in the history of technology. Cars driving left
or right, meter or inch, trains that use different gauges ...
So maybe we'll still have gamma 1.8 and 2.2 when Mac and PCs are long
gone and no-one even remembers CRTs ...
Displays are generally set to around gamma 2.2 native,
Which is an arbitrary decision from a technical POV. They might as
well be set to 1.8 or another value, for that matter.
so the "gamma-do-nothing" strategy works pretty well.
It's more of a gamma-do-all-in-display-emulation strategy, isn't it?
Technically, this whole gamma thing seems obsolete. You could decide
for a visually optimal distribution of data (*L?) and leave it at
that. And even this would become relatively irrelevant once 32 bit
imaging becomes the standard.
All moving media use a basic gamma 2.2 assumption.
Which is a heritage from PCs and CRTs. But of course, it's a fact now.
Apple's committement to gamma 1.8 means that they must basically
change the transfer function in all applications that import video
content to gamma 1.8. This would also imply that all applications,
must convert from Mac Gamma to some assumed gamma or transfer
function based upon the media when exporting. So we have here a
platform that universally must "touch" every piece of content that
passes through it.
How so? They could leave the material untouched and just adjust the
screen display (a fixed 2.2 -> 1.8 display matching, so to say).
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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| References: | |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Andrew Rodney <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: "email@hidden" <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
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