Fwd: Theoretical CMYK Profile "and Lch"
Fwd: Theoretical CMYK Profile "and Lch"
- Subject: Fwd: Theoretical CMYK Profile "and Lch"
- From: <email@hidden>
- Date: Sun, 14 May 2006 15:47:17 -0400
Just to make the thread easier to read, I forward my
answer sent only to Daniel.
Danny Pascale
email@hidden
www.BabelColor.com
--- the forwarded message follows ---
--- Begin Message ---
- Subject: Re: Theoretical CMYK Profile "and Lch"
- From: <email@hidden>
- Date: Sun, 14 May 2006 13:39:43 -0400
Daniel,
this is true for a cylindrical color model .. but hey
the Lab model is a cube ;-)
Mathematically, L*C*h* is a cylindrical model, but RGB
color spaces do not correspond to symmetric/full L*a*b*
cubes or perfect cylinders! As well, all the colors human
can see are not defined by a L*a*b* cube. And, if L*a*b*
was a cube, one of the cube surface would be at 100% L*,
with 100% Lightness for all colors, which is impossible.
... All edits I ever made with those Photoshop sliders
worked out just as expected.
Nobody said that HSB does not work (it is way more
intuitive than RGB). It is just that the numbers cannot be
used as a device independant representation of the
physical color, which is the point of using L*C*h*. This
is why the RAL organisation (based in your country)
selected a re-ordering of the L*C*h* notation (called HCL
!) for it RAL DESIGN national standard notation.
Best regards,
Danny
On Sun, 14 May 2006 19:02:35 +0200
"Daniel Lowicki" <email@hidden> wrote:
Danny,
In HSB notation, any Hue (H) can have a Brightness (B)
of
100! So, all greens can have the same max brightness as
all reds;
this is true for a cylindrical color model .. but hey
the Lab model is a cube ;-)
My theory is that your statement has no effect on
practical
work. All edits I ever made with those Photoshop sliders
worked
out just as expected.
br
Daniel
email@hidden wrote:
Daniel,
Just a few words to add to what Roger said:
In HSB notation, any Hue (H) can have a Brightness (B)
of
100! So, all greens can have the same max brightness as
all reds; this is enough to get the blues!
In short, the HSB notation, while better than RGB for
visualization purposes, is not truly very representative
of reality!
And similar comments to the one above and those Roger
mentioned also apply to HSL (Hue-Saturation-Lightness),
or
HSV (Hue-Saturation-Value) notations.
For more info on HSB and L*C*h* you can download this
pdf
http://www.babelcolor.com/download/BabelColor_Help.pdf
and look in the "Technical data/Definitions and theory"
section.
Danny Pascale
email@hidden
www.BabelColor.com
On Sun, 14 May 2006 08:51:38 +0200
"Daniel Lowicki" <email@hidden> wrote:
Guys,
excuse me .. but why are you missing LCh editing ?
I use the "hue, saturation, and brightness" sliders
instead. What's the
big difference.
Glad to learn,
Daniel
Roger Breton wrote:
How about a next version of Photoshop with Lch?
Any supporters?
Yes please! I find it's pretty darn easy to teach users
how to work
in LCH (it's pretty intuitive to learn). Then maybe we
could also
have a saturation curve in Photoshop as we had in
LinoColor.
Andrew Rodney
http://www.digitaldog.net/
Yes, Pleeeeeease Mr. Adobe!!!!!
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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