This tutorial explains how to compare two colors.
For example a measured color and a Pantone value from a digital color chart.
The Delta E makes it possible to quantify the difference between two colors.
But if you want to know more about what Delta E is, we encourage you to check out the Wikipedia article:
https://en.wikipedia.org/wiki/Color_difference (English version is more complete)
If a Delta E number is less than 1 between two colors that are not touching, it is barely noticeable by the average human observer.
A Delta E between 3 and 6 is generally considered an acceptable number in commercial reproduction, but the difference in color can be seen by printing and graphics professionals.
The Delta E Finder module is able to compare two types of files:
.spc: A color measured with a spectrophotometer. The file contains the measured spectral values.
Read a PANTONE® sample with your spectrophotometer
In this example we will be using a PANTONE® color from a color table.
To use this PANTONE® color table you must have an appropriate license.
The best way to get it is to buy a Formula Guide from PANTONE®. Each purchase of Formula guide gives you access to a code to download its digital version from the PANTONE® COLOR MANAGER software.
For more information, see chapter: Capture of a Color
Import PANTONE C digital color chart
To import a color table, you just have to drag it into the files column on the left.
For more information, see chapter: Color table
Import a selected color from a table to the files column
In your PANTONE® table, indicate in the search bar, the reference of the chosen color, then drag the color in the column of files on the left.
How to get the Delta E between two colors?
The last step is to select one of the two colors, open the Delta Finder module and then drag the second color into the "Color" field of " Delta Finder ".
The Delta E value will be displayed just below.
In our example the Delta E00 between the reference value of the PANTONE 7726 C and the value of the measured sample is 1.4
Choice of the Delta E calculation method
PANTONE® paper color charts are less accurate than their digital versions because printed versions cannot be reproduced with absolute values, let alone wear and tear from handling.
In addition, measurement with a spectrophotometer is more precise and is not disturbed by the ambient environment unlike a visual comparison (Observation under a bad light source for example).