What the study found
The study found that most Color-aid Corporation samples from the two sets matched acceptably, with an average CIE 1976 a*b* color difference (ΔE) of 3.62. It also found that 55 of 67 CAC-314 samples could be matched to the World Color Survey palette by visual inspection.
Why the authors say this matters
The authors conclude that their conversion tables should help researchers translate between color systems and compare findings across studies that used different color sample sets. The study suggests this may support more reproducible methods and better comparability in color cognition research.
What the researchers tested
The researchers measured 65 samples from the CAC-220 set and 67 samples from the CAC-314 set, which are Color-aid Corporation color sample collections used in earlier studies. They did the measurements in two independent laboratories under nominally identical D65 illumination, and they determined colorimetric properties in CIE xyY, Lab, and LCh color systems.
What worked and what didn't
Most CAC-220 and CAC-314 samples showed acceptable correspondence, but six samples showed larger differences. Inter-laboratory measurements agreed well, with ΔEs of 2.70–4.26, while their calibrations differed substantially from previously published CAC measurements, with ΔEs of 11.67–12.70.
What to keep in mind
The abstract notes that sample copy variation, illuminant differences, manufacturing changes, or sample aging might explain some of the differences. Limitations beyond this are not described in the available summary.
Key points
- Most CAC-220 and CAC-314 samples corresponded acceptably, with an average CIE 76 a*b* ΔE of 3.62.
- Six color samples showed larger differences between the two Color-aid sets.
- The researchers matched 55 of 67 CAC-314 samples to the World Color Survey palette by visual inspection.
- Two independent laboratories produced good agreement, with ΔEs between 2.70 and 4.26.
- Their calibrations differed substantially from previously published CAC measurements, with ΔEs between 11.67 and 12.70.
- The authors say the conversion tables should help translate between color systems and improve comparability across studies.
Disclosure
- Research title:
- Color standards were aligned across CAC, CIE, and Munsell systems
- Authors:
- Domicelė Jonauskaitė, Delwin T. Lindsey
- Institutions:
- University of Lausanne, The Ohio State University at Mansfield, The Ohio State University, SUNY College of Optometry
- Publication date:
- 2026-04-20
- OpenAlex record:
- View
- Image credit:
- Photo by Andy Brown on Unsplash · Unsplash License
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