Re: L*a*b* image manipulation (was: Change PCS of CLUT input profile)
Re: L*a*b* image manipulation (was: Change PCS of CLUT input profile)
- Subject: Re: L*a*b* image manipulation (was: Change PCS of CLUT input profile)
- From: Eric Chan <email@hidden>
- Date: Thu, 11 Oct 2007 04:39:38 -0700 (PDT)
> Now you really got me, I was hoping LAB would be the
> perfect color
> space for saturation, tone mapping, sharpening,....
> manipulations. I
> was hoping that changing saturation in LAB was just
> a matter of
> applying a multiplication to a*b and that tone
> mapping could be
> easily done with L* without affecting color.
>
> Is LAB particularly bad or does it just have it's
> flaws (as probably
> every color space has). What is it good for?
CIE Lab was originally designed to measure color
differences. It has been shown that lines of constant
hue actually become curves when mapped into Lab, esp.
in the blue-purple areas and red-orange areas.
See here for more:
http://www.brucelindbloom.com/MunsellCalcHelp.html#BluePurple
Eric
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