Please be aware that due to the color graphic limitations of
computer graphics and monitors it is very difficult to make exact
representations of how colors will appear in an optical system. But this
graphic does give a clear idea of the results of additivity failures in
heterochromatic bright brightness matching. If the top two fields
were red + white and green + white and they were then superimposed the bottom
field would be yellow and white. The yellow would be less bright than the
white even though the top two color fields were matched in brightness to the
white reference field.
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