Re: Delta E 94 formula
- Subject: Re: Delta E 94 formula
- From: <email@hidden>
- Date: Wed, 19 Jan 2005 22:39:06 -0500
- Delivered-to: email@hidden
- Delivered-to: email@hidden
Ken,
To which I would add the formula for DeltaH:
DeltaH(ab)=(DeltaE(ab)^2 - DeltaL* ^2 -
DeltaC(ab)^2)^(1/2)
and two precisions to Brian that:
C*(ab)= [C*(ab,1)C*(ab,2)]^(1/2)
is to be used when none of the samples can be considered a
reference (or standard).
and that the question marks that appear before E*, L* and
C* in Ken's equation (at least when I look at them on my
PC) are "Deltas" (greek letter).
Its fun to write equations in an e-mail!
Regards,
Danny
dpascale @ babelcolor.com
On Wed, 19 Jan 2005 13:44:33 -0500
Ken Fleisher <email@hidden> wrote:
Correction:
The last line should read:
C*(ab) = C*(ab,standard) OR [C*(ab,1)C*(ab,2)]^(1/2)
Does anyone have the formula for delta E 94 that I could
use to plug
into
Excel?
Subscripts are shown in parentheses:
?E*(94) = [ ( ?L* / k(L)S(L) )^2 + ( ?C*(ab) / k(C)S(C)
)^2 + (
?H*(ab) / k(H)S(H) )^2 ]^(1/2)
where:
S(L) = 1
S(C) = 1 + 0.045C*(ab)
S(H) = 1 + 0.015C*(ab)
k(L) = k(C) = k(H) = 1 (for reference conditions)
C*(ab) - C*(ab, standard) OR [ C*(ab,1)C*(ab,2) ]^(1/2)
Ken
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