Calculating delta E
Calculating delta E
- Subject: Calculating delta E
- From: John Wawrzonek <email@hidden>
- Date: Wed, 27 Mar 2002 10:32:03 -0800
I use Microsoft Excel to paste most of my LAB data read from color
charts. It's an easy place to type the formula for delta E and to
compare any number of readings.
It is a good way to look over the readings, check if you got the
right number (like missing a strip with a DTP 41), average two or
more sets of readings, and to check the performance of your
spectrophotometer.
Do this by taking two sets of readings and then calculating the delta
A for each patch.
If you are ambitious, take three sets of readings, calculate an
average for the three sets ((L1+L2+L3)/3). Then check the delta E
between any reading and the average. This will single out problem
readings. Then average the delta E's for all the readings and get an
overall error. It is good for this number to be less than 1.
You can also find errant individual readings by looking for ones with
large (greater than 2 or 3) delta Es. These can be manually rechecked
and replaced.
John Wawrzonek
--
John Wawrzonek
39 Woodbury Road
Southborough, MA 01772
Tel. 508-481-7529
Cell.508-868-3314
Fax. 508-485-7346
email@hidden
www.lightsongfineart.com
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