Originally Posted by Jeroen1000
The white reading was
So, the calculator on Bruce's side is also not entirely accurate?
Bruces Calculator is completely accurate.
If white Y is 124.98 and your white reading is 15.06 cd/m then that reading has a Yn value of .1204 Yn
If you are in CalMAN and using 75% white as your target luminance (the default setting), then your target Y for red is the 75% white reading * 0.2126 or in this case 14.125
When you normalize the target to white you get 0.113 as the Yn target.
so now we have
Measured x,y,Yn value of 0.648, 0.3301, 0.1204
Target x,y,Yn value of 0.64, 0.33, 0.113
So using D65 as our white point we get
Measured L*a*b* 41.27, 67.52, 59.74
Target L*a*b* 40.08, 64.87, 54.43
The dE94 between those two L*a*b* values is 1.9
I'm not entirely sure what Tom does that raises his dE numbers, but when you correctly normalize luminance you'll get the correct result.