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Delta E Calculator

In today’s Graphic Arts Industry Color Management is imperative. Therefore, understanding how to measure the difference between two colors must be easily calculated. Understanding today’s defined standards and comparing them to your results is also a must. And finally maintaining neutrality is the backbone to sustaining color. The deltae app is a tool to help you with all of that and then some.


Delta-E
In the Delta-E tab you are able to do a direct comparison between two colors. Simply type in the LAB values of the reference color and the LAB value of the measured color and the Delta-E (based on Delta-E 1976) will be calculated. If the results are less than 1.50 than the value will be displayed in a green box (this is a tight tolerance), if the value is between 1.51 and 3.00 than the value will be displayed in a yellow box (this is an average tolerance), if the value is 3.01 and above the value will be displayed in a red box (this is showing a wider tolerance and potentially two colors that may not appear the same).


Paper White Check
In the Paper White Check tab you are given the opportunity to compare your measured paper white to the values defined by the International Standard. There are two preloaded paper whites; Type 1 (typical to the sheetfed industry) and Type 2 (typical to the web offset industry, and sometimes found in the folding carton industry). Note the defined paper whites pertain to measurements with white backing.

Merely select Type 1 or Type 3 and input your measured LAB values from your paper white and the Delta-E deviation will be displayed below. If the results are less than 1.50 than the value will be displayed in a green box (this is a tight tolerance), if the value is between 1.51 and 3.00 than the value will be displayed in a yellow box (this is an average tolerance), if the value is 3.01 or above the value will be displayed in a red box (this is showing a wider tolerance and potentially two colors that may not appear the same).


Ink Solid Check
In the Ink Solid Check tab you are given the ability to compare your measured values of the solid patches of Cyan, Magenta, Yellow and Black to that of the values defined by the International Standard.

Cyan: L* 55.00, a* -37.00, b* -50.00
Magenta: L* 48.00, a* 74.00, b* -3.00
Yellow: L* 89.00, a* -5.00, b* 93.00
Black: L* 16.00, a* 0.00, b* 0.00

First, select the color which you would like to compare your results to (Cyan, Magenta, Yellow or Black), then type in your measured results in the applicable LAB fields and your Delta-E deviation will be displayed at the bottom of the screen. If the results are less than 1.50 than the value will be displayed in a green box (this is a tight tolerance), if the value is between 1.51 and 3.00 than the value will be displayed in a yellow box (this is an average tolerance), if the value is 3.01 or above the value will be displayed in a red box (this is showing a wider tolerance and potentially two colors that may not appear the same).


Gray Balance
The Gray Balance tab was developed for those of you who are managing your color based on neutrality. The 25%, 50% and 75% areas for combined CMY patches and Black only patches are required for this area.

The patches are defined (before any output curves are applied) as:
25% CMY = 25% Cyan, 19% Magenta, 19% Yellow
50% CMY = 50% Cyan, 40% Magenta, 40% Yellow
75% CMY = 75% Cyan, 66% Magenta, 66% Yellow
25% Black = 25% Black
50% Black = 50% Black
75% Black = 75% Black

First there is an average weighted Delta-E L* and a maximum weighted Delta-E L* calculation for both the CMY patches and the Black patches. This is basically a comparison of your measured L* values at the 25%, 50% and 75% patches versus the values based on GRACoL (CMY and Black displayed separately based on which button is selected; CMY NPDC or K NPDC). The results are the average difference between the three patches and the maximum difference between the three patches compared to GRACoL at the same three patches (remember only input your measured L* value for these results). If the results are less than 3.00 than the value will be displayed in a green box (this is an acceptable tolerance), if the value is 3.01 or above the value will be displayed in a red box (this is potentially an acceptable tolerance).

Finally there is an average weighted Delta-E Ch and a maximum weighted Delta-E Ch calculation for the CMY patches. This is basically a comparison of your measured a* and b* values at the 25%, 50% and 75% patches versus the values based on GRACoL (for this option you must select the CMY Gray Balance Check). The results are the average difference between the three patches and the maximum difference between the three patches compared to GRACoL at the same three patches (remember in this area only input your measured a* and b* values for these results). If the results are less than 3.00 than the value will be displayed in a green box (this is an acceptable tolerance), if the value is 3.01 or above the value will be displayed in a red box (this is potentially an acceptable tolerance).