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[Physltest] [Phys-L] Re: primary colors



Actually, it is impossible to reproduce the colors of the rainbow according
to the engineering model of color, because the entire rainbow lies outside
of the triangle formed by the primaries on the chromaticity diagram. Indeed
according to the engineering theory it is only possible to reproduce at most
3 colors of the rainbow.

However, people are easily satisfied by less than perfect reproduction. If
you look at the chromaticity diagram often more than 1/2 of the color space
is not included inside the primary triangle. This is of course depends on
the medium, such as printers, monitors, color film ...

John M. Clement
Houston, TX

2) Also I find it alarmingly loose to suggest that any
three primaries can cover "all the other colors in
the rainbow". In either system (additive or subtractive)
there are going to be many colors of the rainbow that
are left out, i.e. not well approximated by mixing the
three primaries (under mild assumptions such as non-
negative amounts of each primary).

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