COLORCOLOR

Chapter 14, Section 4Chapter 14, Section 4

Pg. 543-545Pg. 543-545

Pigment Colors

Mixing color of pigment (i.e.) paints is Mixing color of pigment (i.e.) paints is different than mixing colors of light.different than mixing colors of light.

Primary color of pigmentsPrimary color of pigmentsMagentaMagentaYellowYellowCyanCyan

These colors are mixed to form These colors are mixed to form secondary colors.secondary colors.

Seeing Color

Your eyes see color using cones in Your eyes see color using cones in your eye.your eye.

Your eyes use rods to see in low light Your eyes use rods to see in low light situations.situations.

Cones do not work well in low light.Cones do not work well in low light.

Colors of light

Light also has three primary colors:Light also has three primary colors:RedRedBlueBlueGreenGreen

Mixing two of these colors give us Mixing two of these colors give us secondary colors.secondary colors.

Mixing all three give us white light.Mixing all three give us white light.

From Longest to Shortest λ

RedRed OrangeOrange YellowYellow GreenGreen BlueBlue IndigoIndigo VioletViolet

We use the mnemonic Roy G. Biv to help us remember this.

Seeing Colors of Light

For opaque For opaque (objects you can’t see (objects you can’t see through)through) you see the color or colors you see the color or colors the object reflects.the object reflects.

Ex: When white light shines on a Ex: When white light shines on a strawberry all colors of light but red strawberry all colors of light but red are absorbed. So you see are absorbed. So you see redred..

Seeing Colors of Light

If something appears white all colors If something appears white all colors of light are reflected.of light are reflected.

If something appears black all colors If something appears black all colors of light are absorbed.of light are absorbed.

Seeing Colors For transparent For transparent

and translucent and translucent objects you see the objects you see the color of light that is color of light that is transmitted transmitted through the object.through the object.

Ex. If something Ex. If something appears green appears green then only green then only green light is transmittedlight is transmitted

Optical Illusions An optical illusion is designed to An optical illusion is designed to

“trick” the eye.“trick” the eye.

Which is darker A or B?

They are the same!

Rotating Snakes

How many colors are there?

Pictures with multiple meanings…

Pictures with multiple meanings…

Pictures with multiple meanings…

Pictures with multiple meanings…

Pictures with multiple meanings…

Pictures with multiple meanings…