FAQ: What is delta E 94, delta E 2000, or delta E 76? Can measure these delta E's with the Agera?
Important Notes:
Applies to: Agera, EasyMatch QC, Aeros, VISTA
Answer:
dE = Hunter Lab 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* = delta E 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 delta E 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 EasyMatch QC.
deltaE2000 =CIE's year 2000 recommendation to replace delta E 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 EasyMatch QC and Essentials.
As computing power has increased the ability to create more complex tolerancing equations is enabled. Think that in 1976 handheld calculators 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 speed and higher could do even more complex computations in less time than the DOS computers.
Do you still need more information? Submit a ticket and our support team member will reach out to you soon!
FAQ: What is delta E 94, delta E 2000, or delta E 76? Can measure these delta E's with the Agera?
Answer:
dE = Hunter Lab 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* = delta E 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 delta E 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 EasyMatch QC.
deltaE2000 =CIE's year 2000 recommendation to replace delta E 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 EasyMatch QC and Essentials.
As computing power has increased the ability to create more complex tolerancing equations is enabled. Think that in 1976 handheld calculators 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 speed and higher could do even more complex computations in less time than the DOS computers.
Do you still need more information? Submit a ticket and our support team member will reach out to you soon!