color

COLOR

Pigment Colors

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

Primary color of pigmentsMagentaYellowCyan

These colors are mixed to form secondary colors.

Seeing Color

Your eyes see color using cones in your eye.

Your eyes use rods to see in low light situations.

Cones do not work well in low light.

Colors of light

Light also has three primary colors:RedBlueGreen

Mixing two of these colors give us secondary colors.

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.

Electromagnetic spectrum

Seeing Colors of Light

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

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

Seeing Colors of Light

If something appears white all colors of light are reflected.

If something appears black all colors of light are absorbed.

Seeing Colors For transparent

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

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

Optical Illusions An optical illusion is designed to

“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…