Visualization of Curves: basic knowledge for selecting the Best Match

e-finder

1. In the spectral curve tab you will find curves for evaluation representing

Four measurement angles can be seen in the graph. 15,25,45 and 75
Red is for the original, blue for the target and green is for the theoretical adjusted.
The numbers of this graphic show for which angle they are

The left side of the graph indicates the reflectance
Curves reaching the top of the graph indicate a color that is lighter, which is reflecting more light
Curves at the bottom indicate a dark color which has less reflectance

Note: this scale will change per color displayed. Always check scaling when evaluating curve

3. The horizontal line indicates where the color is within the visible light spectrum

4. Color: Wavelength Interval

5. Example of light color

6. Example of dark color

7. Example of dark blue

8. Example of dark red

9. When evaluating the curves be aware of the following…

Some examples of bad match seen with the spectral graph:

In this example we still have an unacceptable quality score of 44%.

Here the difference in lightness between the target and the match is significant in multiple areas and lines are crossing between the target and match lines signifying a possible difference in pigmentation.

9a. Some examples of bad match seen with the spectral graph

This example shows a result with an original quality score of 73% and an adjusted of 91%.

This graph can signify the match and the target will be a bit brighter in the 15°.
The area which the lines cross and the spectral curves do not flow together can signify different pigmentations.

In this case it is advised to check the ingredients and select a match that contains the expected pigment/ effects and do a spray out.

*Refer to Steps/Photos 10a and 10b for the below information*

In this example we can see the quality scores for result 1 and result 2 are both in the yellow but if we look at the spectral curves, we can make an informed choice of which will be a better match.

Result on the left signifies the match is light in the 15° angle. The adjusted there looks good, the peaks are aligned, and the curves flow smoothly

Result on the right has very similar quality scores to result one and the 15° angle is closer in in reflectance BUT we see the peaks are offset. This lets us know there is most likely a difference in pigmentation that cannot be fixed with correction or application.

10a.

Smooth curves with peaks aligned.

This looks good!

10b.

Although the curves look closer here the peaks do not align.

Look at a different result!

11a. Recap

Spectral lines should:

Flow smoothly between target and match from software
Peaks align (if offset this can signify incorrect pigmentation between match and target)
Have minimal crossing of spectral curves between target and match. (Many crossing lines can signify a metamerism and/or differences in pigmentation)
If multiple results are acceptable, as it is easier to correct lightness than color, select the "lighter" curve for your spray out.