A one dimensional halftone cell has 50% coverage with reflection density 2.0 and 50 % coverage with reflection density 1.0. How is L* calculated for this cell?
You first need to convert from visual density, D, to luminance factor, Y for each cell. (Y = 10^-D). Then you would average the two Y values (since both are 50% coverage, otherwise you would do a weighted average according to the areas) to get the overall Y value, which is then plugged into the L* equation.
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