Re: L*a*b* image manipulation
Re: L*a*b* image manipulation
- Subject: Re: L*a*b* image manipulation
- From: Graeme Gill <email@hidden>
- Date: Fri, 12 Oct 2007 11:39:48 +1000
Steve Upton wrote:
L* is pretty good actually, it's a/b that'll get you. If you want to do these kinds
> of manipulation then you should either look at Bruce Lindbloom's correction profiles
> that unwarp Lab to some extent OR go the more popular route and look into color
> appearance models such as CIECAM02. Ref: Mark Fairchild's "Color Appearance Models"
There are other alternatives as well, if hue linearity is a main consideration.
IPT Color Appearance Space for instance seems to have good hue characteristics,
and even CIELUV is a good deal better than L*a*b* in this regard.
F. Ebner and M.D. Fairchild, “Development and testing of a color space (IPT) with
improved hue uniformity”, Proc.6th IS&T/SID Color Imaging Conference, 8-13 (1998).
Another approach is to try and correct for the hue linearity
problems in L*a*b*. See (ie. try Google) "Color Gamut Mapping in a
Hue-Linearized CIELAB Color Space, Gustav J. Braun and Mark D. Fairchild".
Graeme Gill.
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