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1)i understand the need to use the Lab colors, thanks. so i need to find the shortest distance on the chart between my tooth sample and shades (a1,a2,a3,etc...).but should i use 3-D (include Luminosity) or 2-D with only a,b coordinates?

2)here is my current excel after recent update with 3-d coordinates that finds the closest color (delta E). am i doing it right now? this is the formula i'm using to measure the distance: https://www.easycalculation.com/analytical/learn-distance3.php

http://www.dentopolis.org/temp/ShadeMatch.xlsx

3)does it matter if photoshop can't divide colors into Value, Hue and Chroma as numbers?

4)this is my real life case.i made a selection for tooth parts, filter-average, color picker and pasted Lab values into excel. but it tells me that all those parts are A4 shade! it should display some dark color at the tooth neck and light color at the edge. strange. Lab values are very close to each other (very small range).

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