Re: CIEDE2000 and CIELUV versus CIELAB

• Subject: Re: CIEDE2000 and CIELUV versus CIELAB
• From: Lorenzo Ridolfi <email@hidden>
• Date: Mon, 26 Nov 2007 23:45:29 -0200
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Steve,
The following reference:,
http://www.iscc.org/jubilee2006/abstracts/LuoAbstract.pdf,  gives a
historical perspective  in the color difference formulas. In this paper,
it's clear that CIELUV stopped and new formulas based on CIELAB were
developed, like CIEDE2000 and others. I believe CIELUV is rarely used
nowadays.

Best regards,
Lorenzo

Thanks Lorenzo.

Ok so I'm way behind the curve!  I've just not seen CIECAM02 deployed in any
of the tools I use, eg Photoshop.

Perhaps I should rephrase my question.  I understand that one can calculate
colour differences using a "delta-UV" equation and the LUV space.  Is it
considered more accurate to measure colour differences using LAB-based
calculations such as dE(1994) or the "improved" dE(2000) (which I understand
only apply to the LAB space) than computing colour differences in the LUV
space with LUV-based formulae?  By "more accurate" I mean that the numbers
calculated represent better estimates of perceived differences (with 1 unit
of delta, however calculated, being the theoretical minimum perceivable
difference for normal human vision).

(Measure two colours and calculate dE according to dE(uv), dE(1994) and
dE(2000) and you'll get three different answers.  Which measurement is
considered the best estimate/representation of typically perceived
difference?)

Regards

Steve

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