If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Delta E(cmc) formula
=(((B1-A1)^(2))+((B2-A2)^(2))+((B3-A3)^(2)))^(1/2)
Just to mention another way as a worksheet function: (I find easier to read) =SQRT(SUMSQ(B1-A1,B2-A2,B3-A3)) Just to mention...you are using the formula.. [(DL* / lSL)^2 + (DC*ab / cSC)^2 + (DH*ab / SH)^2]^0.5 with a variable SL = 0.511 It was mentioned here a while ago that the equation does not appear correct. There is no variable "lSL" It appears to be something like: (DL * / (L*SL))^2 ...etc (C*SC)...etc I may be wrong thou... = = = = Dana DeLouis Robert wrote: "Robert" wrote: I finnally got it worked out. Say your standard is in cells A1 for L., A2 for a., and A3 for your b. Your test sample is in cells B1 for L., B2 for a., and B3 for the b. Here is the formula I am useing note there may be other ways to write it but I know this works. =(((B1-A1)*(B1-A1))+((B2-A2)*(B2-A2))+((B3-A3)*(B3-A3)))^(1/2) It could probably be written this way as well=(((B1-A1)^(2))+((B2-A2)^(2))+((B3-A3)^(2)))^(1/2) "Michelle7890" wrote: Does anyone out there have the Delta E cmc formula for excel? I am trying to set up a spreadsheet that compares colors of test samples to a reference sample in a spreadsheet. But my excel skills are not this good. Thanks, Michelle CMC = [(DL* / lSL)^2 + (DC*ab / cSC)^2 + (DH*ab / SH)^2]^0.5 whe SL = 0.040975L* / (1+0.01765L*) unless L 16 when SL = 0.511 SC = 0.0638C*ab / (1+0.0131C*ab) + 0.638 SH = (fT + 1 - f)SC whe f = [(C*ab)^4 / {(C*ab)^4 + 1900)}]^0.5 T = 0.36 + |0.4 cos(hab + 35)| unless h is between 164 and 345 degrees when T = 0.56 + |0.2 cos(hab + 168)| |
|
Thread Tools | |
Display Modes | |
|
|