PDF Ch. 18.4 - COLOR
[Pages:11]Ch. 18.4 - COLOR
II. Light and Color
(p.545 #1-7) (p.553 #1-8) Quiz: 17.1-17.2 & 18.2-18.3
Light and Matter Seeing Colors Mixing Colors
A. Light and Matter
Opaque absorbs or reflects all light
Transparent allows light to pass through completely
Translucent allows some light to pass through
B. Seeing Colors
White light contains all visible colors - ROY G. BIV
In white light, an object... reflects the color you see absorbs all other colors
REFLECTS ALL COLORS
ABSORBS ALL COLORS
B. Seeing Colors
Stimulates red & green cones
The retina contains... Rods - dim light, black & white Cones - color ? red - absorb red & yellow ? green - absorb yellow & green ? blue - absorb blue & violet
Stimulates all cones
B. Seeing Colors
Color Blindness one or more sets of cones does not function properly
Test for red-green color blindness.
C. Mixing Colors
Primary light colors red, green, blue additive colors combine to form white light EX: computer RGBs
View Java Applet on primary light colors.
C. Mixing Colors
Filter
transparent material that absorbs all light colors except the filter color
View Java Applet on filters.
C. Mixing Colors
Pigment colored material that absorbs and reflects different colors
Primary pigment colors cyan, magenta, yellow subtractive colors combine to form black EX: color ink cartridges
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