Tutorial 1:

MacAdams's theory about color impression

1942: Douglas MacAdam performed tests to define how well the average human eye distinguishes similar colors

=> A homogeneous color impression results in an elliptical area within the CIE 1931 (x,y)-chromaticity diagram, the so called MacAdam ellipse

MacAdam ellipses and SDCM

• Dimension of a MacAdam ellipse is given by the so called Standard Deviation of Color Matching (SDCM)
• SDCM characterises the quality of color differences
• The range of Kelvin (e.g. +/- 300 K) gives no hint about homogeneity

• Tutorial 2: Color temperature range and homogeneity