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Light & Color. Light:. Light that can be sensed by our eyes is Visible Light Visible light consists of a continuous range of wavelengths or frequencies Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength . Dispersion & Recomposition:.

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Presentation Transcript
light
Light:
  • Light that can be sensed by our eyes is Visible Light
  • Visible light consists of a continuous range of wavelengths or frequencies
  • Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength
dispersion recomposition
Dispersion & Recomposition:
  • If a prism is placed in a beam of white light:
slide4
Dispersion occurs resulting in the ‘separation’ of light into a spectrum of colors
  • A type of refraction
    • Refractive index varies with the wavelength or color of light
    • Dispersion due to different refractive angles
  • How rainbows occur
slide6
When light strikes an object, the specific wavelengths can be absorbed or reflected
  • The wavelengths that are reflected by an object, cause the perceived color of the object
  • Ex.

ROYBIV all absorbed by object

G reflected

Therefore object “appears” green

G

ROYGBIV

Capable of absorbing ROYBIV

slide7
If all absorbed, then object appears black
  • If all reflected, then object appears white
slide8

Ex.

What color will the objects appear to be?

RO

GBIV

ROYGBIV

ROYGBIV

ROYGBIV

nothing BLACK

Capable of absorbing ROY

Capable of absorbing YGBIV

Capable of absorbing ROYGBIV

viewing objects
Viewing objects:
  • Objects may be viewed through filters &/or under different light
  • Causing the color of objects to be perceived differently
  • Recall white light is ROYGBIV
slide10
Filterswill only allow specific colors of light (& the color on either side in the spectrum) to pass
  • Ex.

ROYGBV

GBV

Blue Filter

slide11

Ex.

White light passes through a yellow filter. What color light will pass?

ROYGBV

OYG

Yellow Filter

slide12
Recall colors are perceived b/c of the color of light reflected
  • Viewing objects under different color light will affect the perceived color since some colors may or may not be present to be reflected!!!
slide13

Ex.

A white dress is viewed under a blue filer. What color will the dress appear?

BLUE

ROYGBV

GBV

Blue Filter

slide14

Ex.

A yellow shirt is viewed under a green filer. What color will the shirt appear?

Yellow

ROYGBV

YGB

Green Filter

slide15

Ex.

A red shirt is viewed under a yellow filer. What color will the shirt appear?

BLACK

ROYGBV

OYG

Yellow Filter

slide16

Ex.

A blue shirt is viewed under red light. What color will it appear?

ROYGBV

BLACK

slide17

Ex.

A blue shirt is viewed under green light. What color will it appear?

ROYGBV

BLUE

slide18

Ex.

When the first light is used, he appears to be wearing black shoes, red pants & a red shirt

Standing on a stage, a singer is illuminated by three lights, each emitting a different color.

When the second light is used, he appears to be wearing blue shoes, black pants & a blue shirt

When the third light is used, he appears to be wearing black shoes, black pants & a green shirt

What color are the singer’s shoes, pants & shirt?

slide19

Reflecting blue so….

Reflecting red so…

Reflecting all so…

Shoes are blue

Pants are red

Shirt is white

-----

RO

RO

Red

GBV

-----

GBV

Blue

-----

-----

YGB

Green

color addition
Color Addition:
  • White light is ROYGBIV but…
  • White light can also be produced by adding colors (or frequencies)
  • Any three colors of light which produce white light when combined are primary colors of light
  • RED, GREEN & BLUE
slide21
By adding primary colors of light, other colors can be produced
  • Ex.
  • TVs, computers, stage lights

Yellow

Red

Green

White

Magenta

Cyan

Blue

slide22

Ex.

Yellow

Magenta

Cyan

slide23
Any two colors of light which when mixed together in equal intensities produce white are complementary colors of eachother
  • Ex.
    • Red & Cyan
    • Blue & Yellow
    • Green & Magenta
slide24

Ex.

If magenta light and yellow light are added together, will white light be produced?

Magenta = Red & Blue

Yellow = Red & Green

Light will appear “light pink”

color subtraction
Color Subtraction:
  • Process of “removing” color
  • Increasing absorption of colors and decreasing reflection of colors
  • Ex.
  • Paint pigments, printer ink

Blue absorbed

Red & Green Reflected

Therefore object “appears” yellow

RGB

RG

Pigment capable of absorbing blue light

slide26

Ex.

What color would an object capable of absorbing blue light appear?

Green absorbed

Red & Blue Reflected

Therefore object “appears” magenta

RGB

RB

Pigment capable of absorbing green light

slide27

Primary colors (pigments) of paint are cyan, magenta & yellow

Blue

Cyan

Magenta

Cyan absorbs Red

Magenta absorbs Green

Yellow absorbs Blue

Green

Red

Yellow

Each primary color of paint absorbs one primary color of light

slide28

Try:

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