Re: "Non-linear"?
Re: "Non-linear"?
- Subject: Re: "Non-linear"?
- From: Mo <email@hidden>
- Date: Tue, 7 Oct 2008 15:54:31 -0700
Mike,
I believe that there has been a terminological misunderstanding. I'm
almost
certain that what the Adobe person was referring to were working
spaces that
are *visually linear*, as well as *perceptually uniform*.
And I am sure this is what they meant as well, but it came across as a
bad descriptor and I used it - and it threw the topic into a stock
market tail spin_;o)
"Visually linear" means that equal steps in the color space are
perceived as
equal steps by the human observer. "Perceptually uniform" means that
an
equal amount of change in a color space (in lightness, for example) is
*perceived* as equal regardless of where it takes place within the
confines
of that color space.
Yes, understand and agree.
But in no way does this mean that the working space must have a linear
*gamma* (also called "Tonal Response Curve", or TRC). Visually
linear is not
equal to gamma-linear (TRC = 1.0). As a matter of fact, human vision
is far
from linear, and instead functions more along a logarithmic curve.
(The L*
in Lab is an attempt to model the way human visual perception works,
and is
not very far from gamma 2.2.)
Yea, try and tell that to Timo_;o)
But there are arguments that are pro and con to working in a linear
1.0 color space and I'm intrigued by the argument like many others
that fall into his teachings, but I do know what does and does not
work. I'm just pondering his logic of the subject to be honest as to
ascertain the true viability of working in a linear 1.0 space and for
what purpose.
"Better" is not applicable. What is "better" in a given instance
depends on
how the image was created and which is its intended use.
Better in the sense that what is best to find the optimal RGB working
space for editing and not a source space for converting to another
color space - but it could be both.
mo
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