2 Spectrum of Light2 7 Mixing Colors by Addition Mixing Colors by Subtraction – Define 2727 Colored Filters 4545 Primary Colors from C, M, Y 4848 Color Printing 5151 Mixing Paints 5656 Physicists vs Artists 6060 Illuminating Using Colored Light

Investigating Color Created By Dick Heckathorn 1 April 2K+2

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? a.Look through a prism. b.Shine ray of light into prism c.Rotate prism as light passes through.

I.The Spectrum of Light A.White light can be separated into different colored lights called the spectrum. 2.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.

I.The Spectrum of Light A.White light can be separated into different colored lights called the spectrum. 3.How Does a Diffraction Grating Be Used to Separate White Light Into Its Component Colors? a.Look through a grating at showcase bulb

I.The Spectrum of Light A.White light can be separated into different colored lights called the spectrum. 3.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.

II.Mixing Colors By Addition A.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.

II.Mixing Colors By Addition A.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

II.Mixing Colors By Addition A.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.

II.Mixing Colors By Addition A.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  ____ R + B  ____ G + B  ____ Yellow Magenta Cyan

II.Mixing Colors By Addition A.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  ____ R + C  ____ G + M  ____ White

II.Mixing Colors By Addition A.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? When two colors are added together that produces white light, we call them complementary colors.

II.Mixing Colors By Addition A.Different colored lights overlapping on a white surface are perceived by the eye- brain system as the additive combination of the individual colors. 2.What Are Colored Shadows? a.Look at shadow produced using light from overhead or projector.

II.Mixing Colors By Addition A.Different colored lights overlapping on a white surface are perceived by the eye- brain system as the additive combination of the individual colors. 2.What Are Colored Shadows? b.Look at shadow produced using two light bulbs separated by some distance.

II.Mixing Colors By Addition A.Different colored lights overlapping on a white surface are perceived by the eye- brain system as the additive combination of the individual colors. 2.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.

II.Mixing Colors By Addition A.Different colored lights overlapping on a white surface are perceived by the eye- brain system as the additive combination of the individual colors. 2.What Are Colored Shadows? d.Quiz

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. 1.What Do Colors On A Color TV Screen Look Like Up Close? a.Freeze a colored video on a TV screen. b.Investigate using a lens.

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. 1.What Do Colors On A Color TV Screen Look Like Up Close? a.Tape color bars from 45/49. b.Investigate using a lens.

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. 1.What Do Colors Of A Comic Strip Look Like Up Close? a.Investigate using a magnifying lens.

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. 1.What Do Colors Of Colored Objects In Your Text Look Like? b.Investigate using a magnifying lens.

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. 1.What Do Black And White Pictures In A Newspaper Look Like? c.Investigate using a magnifying lens.

III.Mixing Colors By Subtraction A.Colored lights and colored objects can be described in terms of three attributes: hue, saturation and brightness. 1.The Attributes of Color a.Hue – Main Color Name A sensation b.Saturation – Purity of Color Rich or pale – Strong or weak c.Brightness – Intensity A sensation

III.Mixing Colors By Subtraction A.Colored lights and colored objects can be described in terms of three attributes: hue, saturation and brightness. 1.Naming Colored Lights and Colored Objects. a.What we perceive when: looking at the source or an object illuminated by a source the object is illuminated with white light

III.Mixing Colors By Subtraction A.Colored lights and colored objects can be described in terms of three attributes: hue, saturation and brightness. 1.Naming Colored Lights and Colored Objects. a.What we perceive when: the object is illuminated with any color of light.

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

Say the Color, not the Word YELLOWBLUEORANGE BLACKREDGREEN PURPLEYELLOWRED ORANGEGREEN BLACK BLUERED PURPLE GREENBLUEORANGE

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.

III.Mixing Colors By Subtraction B.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.

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? a.Look through one colored filter at a time while looking at white light.

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? Using: cardboard with slit on projector grating over projection lens colored filters Examine what R, G, B, filters do.

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? a.Look through red White  R + G + B Red  - G - B

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? b.Look through green White  R + G + B Green  -R - B

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? c. Look through blue White  R + G + B Blue  -R - G

III.Mixing Colors By Subtraction B.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

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? e.Look through red and blue Red  - G - B Blue  - G - R Black

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? g.Look through green and blue Green  - B - R Blue  - G - R Black

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? Using cardboard with slit on projector grating over projection lens colored filters Examine what C, M, Y, filters do.

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? a.Look through Cyan White  R + G + B Cyan  - R

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? b.Look through Magenta White  R + G + B Magenta  - G

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? c.Look through Yellow White  R + G + B Yellow  - B

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? d.Look through yellow and magenta Yellow  - B Magenta  - G Red

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? e.Look through yellow and cyan Yellow  - B Cyan  - R Green

III.Mixing Colors By Subtraction B.A colored filter has the property of transmitting certain colors and absorbing others. 1.What Do Colored Filters Do? f.Look through magenta and cyan. Magenta  - G Cyan  - R Blue

III.Mixing Colors By Subtraction B.A colored filter has the property of absorbing certain colors and transmitting others. 1.What Do Colored Filters Do? g.Summary a.Yellow and Magenta b.Yellow and Cyan c.Cyan and Magenta Red Green Blue

Look at Color Power Point

III.Mixing Colors By Subtraction C.The primary colors for mixing by subtraction are cyan, magenta and yellow. 1.Diagram For Overlapping Filters Yellow Cyan White  - B  Yellow- R=Green (R+G+B)(R+G+B)  - B  (R +G) - R=G

III.Mixing Colors By Subtraction C.The primary colors for mixing by subtraction are cyan, magenta and yellow. 1.Diagram For Overlapping Filters. Yellow Magenta White  - B  Yellow- G=Red (R+G+B)(R+G+B)  - B  (R +G) - G=R

III.Mixing Colors By Subtraction C.The primary colors for mixing by subtraction are cyan, magenta and yellow. 1.Diagrams For Overlapping Filters. Magenta Cyan White  - G  Magenta- R= Blue (R+G+B)(R+G+B)  - G  (R + B)- R =B

III.Mixing Colors By Subtraction D.The primary colors used in the printing process are: cyan, magenta and yellow. 1.How is a colored picture made? a.Color Poster b.Show Picture of Garfield

III.Mixing Colors By Subtraction D.The primary colors used in the printing process are: cyan, magenta and yellow. 1.How is a colored picture made? c.Rifle d.Jay’s Poster

III.Mixing Colors By Subtraction D.The primary colors used in the printing process are: cyan, magenta and yellow. 1.How is a colored picture made? e.Color Roller Skating Box f.Greeting Card

III.Mixing Colors By Subtraction E.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.

III.Mixing Colors By Subtraction E.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.

III.Mixing Colors By Subtraction E.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.

III.Mixing Colors By Subtraction E.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

III.Mixing Colors By Subtraction E.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

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 artist’s primary colors of pigments Red – Turquoise - Yellow

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 artist’s primary colors of pigments Red – Blue – Yellow Thus to a physicist Artists say Red - Physicists call magenta Artists say Blue - Physicists call cyan

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 artist’s primary colors of pigments Red – Blue – Yellow Baggie Ad: Blue - Yellow  Green Physicist: Cyan - Yellow  Green

III.Mixing Colors By Subtraction F.Evaluation 15 Question Test

IV.What is the Color? IV.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.

IV.What is the Color? IV.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?

Red Green Blue

IV.What is the Color? IV.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  redred  blackred  black green  blackgreen  greengreen  black blue  blackblue  blackblue  blue

IV.What is the Color? IV.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?

IV.What is the Color? IV.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  redred  blackred  black green  blackgreen  greengreen  black blue  blackblue  blackblue  blue

Illuminate objects with red, green, blue light. IV.What is the Color? 1.Red and White Card & Cloth 2.Multi-Colored Cloth 3.Dusters 4.T-Shirts 5.Lab Coat

1. What are the colors of the letters? V. Evaluation 2. Are you color blind?

1. Is it a green filter? V. Things for Thought 2. What color is the baggie strips? 3. What color is the printing on plastic?

That’s all folks!