miguel@aclcb.purdue.edu (Phillip) (03/23/91)
The additive primary hues, according to an undergrad general psychology
text book I have (Gleitmann (sp?)), are blue and yellow (which are
complementary) and red and green (complementary). Blue, yellow and green
all have a "unique" wavelength at which the human eye/brain percieves them
to be without tinges of any other color. Red is "extra-spectral" in that
it requires a combination of wavelengths to produce a "pure red"
sensation. The complementary hues when mixed in equal amounts produce
grey (i.e. blue + yellow = grey). The process is called "opponent-pair" or
something similar. Mixing (adding) non-complementary hues produces an
intermediate color (i.e. red + yellow = orange).
The subtractive primaries are different. Two pigments mixed together
only allow wavelengths neither absorbs to be reflected.
So how does a color TV work? I understand that it uses only red green
and blue and that red and green mixed together (and surely this would be an
additive process, not a subtractive one) produce yellow.
Does anyone know?
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