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Lighting Inspector

Lighting E-Factor

This is a parameter calculated as an average of the 95 percentile of both ∆E 2000 and ∆Ch, calculated based on an industry standard spectral dataset and comparing measured lighting condition with industry standard: D50.

Basic statistic to this comparison covers:

  • max ∆E,
  • mean ∆E value,
  • 95 percentile ∆E, 
  • and standard deviation ∆E.

For graphical presentation, a Color Rendering Vector Map is displayed:

Vector's heads present reference position in a* b* plane of the Lab space.

Most of the displacements (depending on arrow direction) can be recognized as hue shifts, versus saturation shifts. In most cases, it is a combination of both. This plot is informative only but helps to understand the nature of how the different lighting conditions are different.

When comparing two light sources against a data set, ChromaChecker will identify patch values which show the largest shift or difference (both ∆E and ∆Ch) and are displayed simulating the actual patch colors in a bar chart displaying the largest E-Factor. 

ChromaChecker provides a complete picture of how color is influenced due to different Lighting Conditions.

 

Inter–Lighting E-Factor

This is a version of the E-Factor formula where instead of comparing the light condition to D50; the lighting conditions are compared one to another. This feature enables the ability to compare multiple light conditions to one another and understand how large of a difference the light conditions will render the color in ∆E. 

As it is not possible today to 100% match the D50 condition with artificial light sources, ChromaChecker provides the ability to create a “baseline light condition” which can be the basis for a realistic reference point which will allow lighting condition to produce a 100% match.