Re: Theoretical CMYK Profile "and Lch"
Re: Theoretical CMYK Profile "and Lch"
- Subject: Re: Theoretical CMYK Profile "and Lch"
- From: "Daniel Lowicki" <email@hidden>
- Date: Sun, 14 May 2006 20:10:51 +0200
Danny,
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.
Yes (I know CIELAB looks more like a potato in 3D).
... 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.
Sure LCh is as device independent as Lab.
So you think image editing in LCh would be an advantage
over the HSB sliders ? Or are you asking for an overall
LCh image mode ?
br
Daniel
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