Re: CIEDE2000 and CIELUV versus CIELAB
Re: CIEDE2000 and CIELUV versus CIELAB
- Subject: Re: CIEDE2000 and CIELUV versus CIELAB
- From: Steve Kale <email@hidden>
- Date: Mon, 26 Nov 2007 23:35:59 +0000
- Thread-topic: CIEDE2000 and CIELUV versus CIELAB
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
> From: Lorenzo Ridolfi <email@hidden>
> Date: Mon, 26 Nov 2007 20:31:35 -0200
> To: Steve Kale <email@hidden>
> Cc: <email@hidden>
> Subject: Re: CIEDE2000 and CIELUV versus CIELAB
>
> Steve,
>
> Sorry if I'm messing up a little bit, but neither CIELAB or CIELUV are
> considered "perceptually uniform" nowadays. CIECAM02 is considered a
> more advanced option today. But the "perceptually uniform" is only
> relevant if you are interpolating colors. If you are just looking for
> color difference formulae, choose dE2000 or dE94, using CIELAB as a
> colorspace, and stay with the chosen one.
>
> Best regards,
> Lorenzo
>
> Steve Kale wrote:
>> I understand that the CIELUV space is still preferred by many working with
>> video. In fact I've heard one commentator say that CIELAB is preferred for
>> reflective media applications but CIELUV is preferred by those working with
>> emissive applications. I find such comments puzzling as I had always
>> thought that CIELAB had proven itself over time to be the more "robust" (by
>> which I assume people mean "more perceptually uniform") colour space
>>
>>
>
>
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