It's not necessarily still 1 deltaE.
If I recall correctly, CIEDE2000 is scaled differently from CIE94 and CIELAB
deltaE which results in lower numbers for the same color differences.
Further, I believe that the 1 deltaE JND is usually used for chromatic
colors. As chroma increases, the JND increases beyond 1. Similarly, as you
approach the achromatic axis, the JND decreases to about 0.5. I think that
this number was derived using the original deltaE, so it's probably even
less than 0.5 JND with CIEDE2000.
Although a good rule-of-thumb is that a JND is approximately 1 deltaE, it's
not always the case and it will differ slightly with the different formulae.
Ken
On 12/22/07 2:51 PM, "Roger Breton" <email@hidden> wrote:
>> BTW, do you have numbers for the minimal perceptible difference for the 2000
>> standard?
>
> It is still 1 dE. Why would that change? dE2000 just offers a better
> empirically-rooted metric, just noticeable differences remain the same.
--
Ken Fleisher
Photographer
Imaging & Visual Services
National Gallery of Art
Washington, D.C.
Phone: (202) 712-7471
email@hidden
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