In the human fovea (where all the resolving mechanism is), there are
fewer S-cones (blue sensitivity) than there are M-cones (green) and L-
cones (red).
Quoting Malacara ("Color Vision and Colorimetry:Theory and
Applications," ISBN 0-8194-4228-3): "[the Blue S-cones] do not
contribute to contrast discrimination; thus they are not able to
detect image borders."
You can further find a plot of red-green versus blue-yellow contrast
sensitivity by searching for "Light Vision Color" by Arne Valberg in
Google books and look for Figure 4.29 (page 195):
http://books.google.com/books?q=%22Light+Vision+Color%22+by+Arne+Valberg
Most of the compression techniques (including how digital camera
sensors are manufactured) that involves color images make use of the
fact that blue has little effect on resolution. Blue cones contribute
mainly to hue and chroma.
73,
Chen, W7AY
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