What is deltaE 94, deltaE 2000, or deltaE 76?

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What is deltaE 94, deltaE 2000, or deltaE 76? Can we do it in Agera? 

 

dE = HunterLab color difference where the square root of the sum of the differences squared is reported, in Excel the formula is =sqrt((dL)^2+(da)^2+(db)^2)

dE* = deltaE 76 = CIE76 = CIE's year 1976 CIELAB color difference where the square root of the sum of the differences squared is reported, in Excel the formula is =sqrt((dL*)^2+(da*)^2+(db*)^2)

deltaE94 = CIE's year 1994 recommendation to replace deltaE 76 with a tolerancing color difference equation to better approximate human perception.. For example if dL* = 1 and da* and db* = 0 the dE* =1, this might not be a visually acceptable match to color where dL* =0 da* =1 db*=0 even though this color also has a dE*=1 A tolerancing dE adds terms for differences in Chroma and Hue in addition to dL*da*db*. This would change the size of the color space in relation to where the color resides in color space relative to the standard. This equation is available only in EasyMatchQC.

deltaE2000 =CIE's year 2000 recommendation to replace deltaE 94 with a tolerancing color difference equation to better approximate human perception. This adds more terms such as dH* and rotation of sample in color space. This equation is available in EasyMatchQC and EasyMatchQC Essentials.

As computing power has increased the ability to create more complex tolerancing equations is enabled. Think that in 1976 handheld calcuators were being introduced that could do square root and inverse functions. In 1994 with DOS based computers running at 66MHz more complex equations could be computed in a second or less. In 2000 computers with multi threading processors running a GHz speeds and higher could do even more complex computations in less time than the DOS computers.

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