Color Vision and Color Constancy By: Marshawna Eberhart Achaunti Stevenson Date: Fed 3,2010 7th

Red, Green, and Blue By combing these three primary colors any color can be created

Young-Helmholtz Trichromatic (three color) theory States that the retina has three types of color receptors each especially sensitive to one of the three colors When we stimulate combinations of these cones, we see other colors

Subtractive and Additive Color Mixing There’s no comparing mixing paint to the color theory because mixing paint is subtractive color mixing, the more paint mixed the fewer wavelength reflected back By mixing lights is additive color mixing it increases light and adds wavelength

“The color yellow” Most color deficient people aren't color blind, they just lack functioning red or green sensitive cones or both We see yellow when mixing red and green light and those blind to red and green can often still see yellow. “yellow is a pure color”

Color Constancy Color constancy is our ability to perceive consistent color in objects, even thought the lighting and wavelengths shifts. Our experience of color depends on something more than the wavelength information received by our trichromatic cone and transmitted through the opponent process cells. We all see colors thanks to our brains’ computation of the light reflected by any object relative to its surrounding objects

Green Leaf If you see one green leaf hanging from a brown branch, when the illumination changes, reflect the same light energy that formerly came from the brown branch. Yet to us the leaf still looks greenish and the branch still looks brownish. Meaning if we see this one leaf it would look brown to us but when our brain processes what it is then it would look its regular color.

Color depends on context, Believer it or not these three blue disks are identical in color