Figure 1-4.
Effect of prism on white light
Learning Event 2:
DESCRIBE LUMINOSITY AND THE ADDITIVE METHOD OF COLOR MIXING
1. Luminosity curve. The fact that the human eyes do not perceive each color with
equal efficiency is due in some way to the physical construction of the eye. It is
believed that the cones of the retina respond to color stimuli and that each cone
is terminated by three receptors.
Each receptor is believed to respond to a
different portion of the spectrum, with peaks occurring in the red, blue, and green
regions. An average can be taken of the color response of a number of people, and
a standard for the average person can be derived.
a. This standard
response
is
called
the
luminosity
curve
for
the
standard
observer (fig 1-5).
Figure 1-5.
Luminosity curve
b. The curve is a plot of the response verse wavelength.
We can look at the
luminosity curve and see that maximum response
5
Previous Page
