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Information preserved I(e1; e2) under a changes in daylight illuminant from e1 with correlated colour temperature 25000 K to e2 with correlated colour temperature 6500 K as a function of the logarithm to the base 2 of the number of sample points n. The broken curves are for four different scenes and the solid line of unit slope shows the maximum possible value of I(e1; e2). Each scene was of size 1344 × 1024 pixels.
