2 Spectrum of Light

1
2 Spectrum of Light 7 Mixing Colors by
Addition 22 Mixing Colors by Subtraction
Define 27 Colored Filters 45 Primary Colors from
C, M, Y 48 Color Printing 51 Mixing Paints 56
Physicists vs Artists 60 Illuminating Using
Colored Light
2
Investigating Color

• Created
• By
• Dick Heckathorn
• 1 April 2K2

3
I. The Spectrum of Light

• A. White light can be separated into different
  colored lights called the spectrum.
• 1. Inv How Can A Prism Be Used to Separate
  White Light Into Its Component Colors?
• Look through a prism.
• Shine ray of light into prism
• Rotate prism as light passes through.

4
I. The Spectrum of Light

• A. White light can be separated into different
  colored lights called the spectrum.
• Demo-Disc What Does the Prism Do to the Light?
• a. Shine light from aluminum slide through a
  prism.
• b. Block out all but red light.
• c. Add second prism.
• d. Mount second prism behind first.

5
I. The Spectrum of Light

• A. White light can be separated into different
  colored lights called the spectrum.
• How Does a Diffraction Grating Be Used to
  Separate White Light Into Its Component Colors?
• Look through a grating at showcase bulb

6
I. The Spectrum of Light

• A. White light can be separated into different
  colored lights called the spectrum.
• How Does a Diffraction Grating Be Used to
  Separate White Light Into Its Component Colors?
• b. Look at spectrum using cardboard with slit on
  overhead and with grating fastened to overhead
  lens.

7
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• 1. What Happens When Colors of Light Are Mixed?
• a. Have students perform color addition
  using ray boxes.

8
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• 1. What Happens When Colors of Light Are Mixed?
• b. Overlap colors using projector and 3
  mirrors

9
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• 1. What Happens When Colors of Light Are Mixed?
• c. Mount color wheel on wall.

10
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• 1. What Happens When Primary Colors Of Light Are
  Mixed?

R G ? ____
Yellow
R B ? ____
Magenta
G B ? ____
Cyan
11
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• 1. What Happens When Opposite Colors Of Light Are
  Mixed?

B Y ? ____
White
R C ? ____
White
G M ? ____
White
12
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• What Happens When Opposite Colors Of Light Are
  Mixed?
• When two colors are added together that produces
  white light, we call them complementary colors.

13
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• What Are Colored Shadows?
• a. Look at shadow produced using light from
  overhead or projector.

14
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• What Are Colored Shadows?
• b. Look at shadow produced using two light
  bulbs separated by some distance.

15
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• What Are Colored Shadows?
• c. Look at shadows produced using red, green
  and blue bulbs individually and in combinations
  of first 2 and then all three.

16
II. Mixing Colors By Addition

• Different colored lights overlapping on a white
  surface are perceived by the eye-brain system as
  the additive combination of the individual
  colors.
• What Are Colored Shadows?
• d. Quiz

17
II. Mixing Colors By Addition

• B. Very small and closely spaced areas of color
  are perceived by the eye-brain system as the
  additive combination of the individual colors.
• What Do Colors On A Color TV Screen Look Like Up
  Close?
• Freeze a colored video on a TV screen.
• Investigate using a lens.

18
II. Mixing Colors By Addition

• B. Very small and closely spaced areas of color
  are perceived by the eye-brain system as the
  additive combination of the individual colors.
• What Do Colors On A Color TV Screen Look Like Up
  Close?
• Tape color bars from 45/49.
• Investigate using a lens.

19
II. Mixing Colors By Addition

• B. Very small and closely spaced areas of color
  are perceived by the eye-brain system as the
  additive combination of the individual colors.
• What Do Colors Of A Comic Strip Look Like Up
  Close?
• a. Investigate using a magnifying lens.

20
II. Mixing Colors By Addition

• B. Very small and closely spaced areas of color
  are perceived by the eye-brain system as the
  additive combination of the individual colors.
• What Do Colors Of Colored Objects In Your Text
  Look Like?
• b. Investigate using a magnifying lens.

21
II. Mixing Colors By Addition

• B. Very small and closely spaced areas of color
  are perceived by the eye-brain system as the
  additive combination of the individual colors.
• What Do Black And White Pictures In A Newspaper
  Look Like?
• c. Investigate using a magnifying lens.

22
III. Mixing Colors By Subtraction

• Colored lights and colored objects can be
  described in terms of three attributes hue,
  saturation and brightness.
• The Attributes of Color
• a. Hue Main Color Name
• A sensation
• Saturation Purity of Color
• Rich or pale Strong or weak
• Brightness Intensity
• A sensation

23
III. Mixing Colors By Subtraction

• Colored lights and colored objects can be
  described in terms of three attributes hue,
  saturation and brightness.
• Naming Colored Lights and Colored Objects.
• What we perceive when
• looking at the source or
• an object illuminated by a source
• the object is illuminated with white light

24
III. Mixing Colors By Subtraction

• Colored lights and colored objects can be
  described in terms of three attributes hue,
  saturation and brightness.
• Naming Colored Lights and Colored Objects.
• What we perceive when
• the object is illuminated with any color of light.

25
Say the Color, not the Word

• YELLOW BLUE ORANGE
• BLACK RED GREEN
• PURPLE YELLOW RED
• ORANGE GREEN BLACK
• BLUE RED PURPLE
• GREEN BLUE ORANGE

26
Say the Color, not the Word
YELLOW
BLUE
ORANGE
BLACK
RED
GREEN
PURPLE
YELLOW
RED
ORANGE
GREEN
BLACK
PURPLE
BLUE
RED
GREEN
BLUE
ORANGE
27
Say the Color, not the Word

• YELLOW BLUE ORANGE
• BLACK RED GREEN
• PURPLE YELLOW RED
• ORANGE GREEN BLACK
• BLUE RED PURPLE
• GREEN BLUE ORANGE

Left Right Conflict within brain Your right
brain tries to say the color but your left brain
insists on reading the word.
28
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• The name of the filter is determined by the
  color of light transmitted when white light is
  incident on the filter.

29
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• Look through one colored filter at a time while
  looking at white light.

30
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• Using
• cardboard with slit on projector
• grating over projection lens
• colored filters
• Examine what R, G, B, filters do.

31
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• Look through red
• White ? R G B
• Red ? - G - B

32
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• b. Look through green
• White ? R G B
• Green ? -R - B

33
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• c. Look through blue
• White ? R G B
• Blue ? -R - G

34
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• 1. What Do Colored Filters Do?
• d. Look through red and green
• Red ? - G - B
• Green ? - B - R
• Black

35
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• e. Look through red and blue
• Red ? - G - B
• Blue ? - G - R
• Black

36
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• g. Look through green and blue
• Green ? - B - R
• Blue ? - G - R
• Black

37
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• Using cardboard with slit on projector
• grating over projection lens
• colored filters
• Examine what C, M, Y, filters do.

38
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• Look through Cyan
• White ? R G B
• Cyan ? - R

39
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• b. Look through Magenta
• White ? R G B
• Magenta ? - G

40
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• c. Look through Yellow
• White ? R G B
• Yellow ? - B

41
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• d. Look through yellow and magenta
• Yellow ? - B
• Magenta ? - G
• Red

42
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• e. Look through yellow and cyan
• Yellow ? - B
• Cyan ? - R
• Green

43
III. Mixing Colors By Subtraction

• A colored filter has the property of transmitting
  certain colors and absorbing others.
• What Do Colored Filters Do?
• f. Look through magenta and cyan.
• Magenta ? - G
• Cyan ? - R
• Blue

44
III. Mixing Colors By Subtraction

• B. A colored filter has the property of absorbing
  certain colors and transmitting others.
• What Do Colored Filters Do?
• g. Summary
• Yellow and Magenta
• Yellow and Cyan
• Cyan and Magenta

Red
Green
Blue
45

• Look at Color Power Point

46
III. Mixing Colors By Subtraction

• The primary colors for mixing by subtraction are
  cyan, magenta and yellow.
• Diagram For Overlapping Filters
• Yellow Cyan

White
?
- B
?
Yellow
- R

Green
(RGB)
?
- B
?
(R G)
- R

G
47
III. Mixing Colors By Subtraction

• The primary colors for mixing by subtraction are
  cyan, magenta and yellow.
• Diagram For Overlapping Filters.
• Yellow Magenta

White
?
- B
?
Yellow
- G

Red
(RGB)
?
- B
?
(R G)
- G

R
48
III. Mixing Colors By Subtraction

• The primary colors for mixing by subtraction are
  cyan, magenta and yellow.
• Diagrams For Overlapping Filters.
• Magenta Cyan

White
?
- G
?
Magenta
- R

Blue
(RGB)
?
- G
?
(R B)
- R

B
49
III. Mixing Colors By Subtraction

• D. The primary colors used in the printing
  process are cyan, magenta and yellow.
• How is a colored picture made?
• a. Color Poster
• b. Show Picture of Garfield

50
III. Mixing Colors By Subtraction

• D. The primary colors used in the printing
  process are cyan, magenta and yellow.
• How is a colored picture made?
• c. Rifle
• d. Jays Poster

51
III. Mixing Colors By Subtraction

• D. The primary colors used in the printing
  process are cyan, magenta and yellow.
• How is a colored picture made?
• e. Color Roller Skating Box
• f. Greeting Card

52
III. Mixing Colors By Subtraction

• The mixing of colored paints involves both
  additive and subtractive processes.
• Predicting the resulting color is complicated
  because it depends on the physical properties of
  paints.

53
III. Mixing Colors By Subtraction

• The mixing of colored paints involves both
  additive and subtractive processes.
• 1. The Mixing of Paints and the Artist's
  Primary Colors
• The mixing of water colors and printers inks
  are similar to mixing color filters.

54
III. Mixing Colors By Subtraction

• The mixing of colored paints involves both
  additive and subtractive processes.
• 1. The Mixing of Paints and the Artist's
  Primary Colors
• Mixing pigment-based paints are not so
  simple.

55
III. Mixing Colors By Subtraction

• The mixing of colored paints involves both
  additive and subtractive processes.
• 1. The Mixing of Paints and the Artist's
  Primary Colors
• Paint consists of tiny solid particles in a
  transparent medium.
• The particles have no color or are clear with
  dye added

56
III. Mixing Colors By Subtraction

• The mixing of colored paints involves both
  additive and subtractive processes.
• 1. The Mixing of Paints and the Artist's
  Primary Colors
• Final result affected by
• Density of Particles
• Properties of transparent medium
• Support on which the paint is laid

57
III. Mixing Colors By Subtraction

• F. The naming of the primary colors by physicists
  and artists differ.
• The physicists primary colors of light
• Red Green Blue
• The physicists secondary colors of light
• Magenta Cyan Yellow
• The artists primary colors of pigments
• Red Turquoise - Yellow

58
III. Mixing Colors By Subtraction

• F. The naming of the primary colors by physicists
  and artists differ.
• The physicists secondary colors of light
• Magenta Cyan Yellow
• The artists primary colors of pigments
• Red Blue Yellow
• Thus to a physicist
• Artists say Red - Physicists call magenta
• Artists say Blue - Physicists call cyan

59
III. Mixing Colors By Subtraction

• F. The naming of the primary colors by physicists
  and artists differ.
• The physicists secondary colors of light
• Magenta Cyan Yellow
• The artists primary colors of pigments
• Red Blue Yellow
• Baggie Ad Blue - Yellow ? Green
• Physicist Cyan - Yellow ? Green

60
III. Mixing Colors By Subtraction

• Evaluation
• 15 Question Test

61
What is the Color?

• The color an object appears depends on the color
  of the illuminating light and the properties of
  the object.
• 1. What Is The Color of That Object?
• a. Shine colored light on colored cardboard.

62
What is the Color?

• The color an object appears depends on the color
  of the illuminating light and the properties of
  the object.
• 1. What Is The Color of Red, Green, Blue on
  monitor or computer screen?
• d. Use red, green, blue filter to view
  the screen.
• Why do they appear as they do?

63
Red
Green
Blue
64
What is the Color?

• The color an object appears depends on the color
  of the illuminating light and the properties of
  the object.
• c. Results seen with eye.
• red green blue
• red ? red red ? black red ? black
• green ? black green ? green green ? black
• blue ? black blue ? black blue ? blue

65
What is the Color?

• The color an object appears depends on the color
  of the illuminating light and the properties of
  the object.
• 1. What Is The Color of Red, Green, Blue
  using Felt Tip Markers?
• b. Shine white light on the colors.
• Why do they appear as they do?

66
(No Transcript)
67
What is the Color?

• The color an object appears depends on the color
  of the illuminating light and the properties of
  the object.
• e. Results viewing with filter?
• red green blue
• red ? red red ? black red ? black
• green ? black green ? green green ? black
• blue ? black blue ? black blue ? blue

68

1. What is the Color?

• Illuminate objects with red, green, blue light.

1. Red and White Card Cloth
2. Multi-Colored Cloth
3. Dusters
4. T-Shirts
5. Lab Coat

69

V. Evaluation

• 1. What are the colors of the letters?

2. Are you color blind?
70

V. Things for Thought

• 1. Is it a green filter?

2. What color is the baggie strips?
3. What color is the printing on plastic?
71

• Thats all folks!