Table 4.

Color rendering by relevant colors in two color spaces^17,41,42.

Estimation method	Mean CIECAM02-UCS color difference	Mean S-CIELAB color difference
minCEntropy	3.7 (3.5, 4.0)	4.1 (3.9, 4.4)
Colorimetric method	7.9 (7.7, 8.2)	9.0 (8.9, 9.3)
Human observers	5.5 (5.1, 6.0)	6.2 (5.7, 6.6)
JPEG	9.1 (8.6, 9.5)	12.7 (12.0, 13.3)

Color differences between the original image and its quantized representation are shown for minCEntropy clustering, the colorimetric method, six human observers, and JPEG, with values averaged over the 20 images. Estimated 95% BCa confidence limits³⁶ are shown in parentheses based on 1000 bootstrap replications.