That’s tough because everyone has their own standards for acceptable, or unacceptable matches. Its been stated over the years that many in the print industry will use a dE of 6 or less as an ‘acceptable’ match but YMMV. The basic idea here is a value of 1 or less is not perceivable. And the various types of dE can be a factor although many feel dE2000 is the better algorithm for looking at small differences here.
Another newer and quite interesting metric you may want to examine is called iStar. See: http://www.aardenburg-imaging.com/news.12.html
Oh dear - another new thing! And here I thought I was on the cutting edge by being willing to use dE2000!
Is there a range which can be used, such as:
dE<4 = very good color match
dE4-8 = acceptable color match, most people would not say it was a different color from the one intended
dE>8 = unacceptable, most people would recognize it as a different color from the one intended
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Not that I know of although anyone is free to consider those groups acceptable. One person may find a dE of 6 pretty good, another not close to acceptable. And a dE of 6 for a gray and another color may be perceived quite differently (hence the iStar metric).