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Explanation: And sometimes 'shift'
See for instance:
red means high energy. Colors are automatically scaled from the lowest to the highest
with a color gradient blue-green/green-red. This is especuially useful ... www.usm.maine.edu/spdbv/text/color.htm
Oleg Rudavin Ukraine Local time: 21:24 Native speaker of: Russian, Ukrainian PRO pts in pair: 4
Explanation: It refers to the "a" value of a CIE L*a*b* color definition, as described below:
...spectral distribution of standard daylight of type D65. The measured data is output in the CIELAB 76 (L*a*b* and L*C*h) colour system. The colour coordinate L* represents a brightness parameter in the range from black (0) to white (100), whereas the coordinate a* specifies the differences between red and green tones: positive values of a* show the presence of reddish colour components. The coordinate b* describes the differences between the blue and green tones and is thus a direct indicator of a yellow coloration. The b* value shows a close correlation with the quantity of carotene pigments.