1 Department of Physics & Astronomy University of Nebraska-Lincoln Lincoln NE Color By Christine DeVries

2 What is COLOR?

33 The Electromagnetic Spectrum

4

5 wavelength

6 Wavelength  (nm) Gamma rays X- rays Ultra- violet Infrared Micro -wave EHFEHF SHFSHF UHFUHF VHFVHF HFHF MFMF LFLF ELF The Electromagnetic Spectrum

7 wavelength  (nm) Gamma rays X-rays Ultra- violet Infrared Micro- wave EHFEHF SHFSHF UHFUHF VHFVHF HFHF MFMF LFLF ELF 400 nm500 nm600 nm 700 nm The Electromagnetic Spectrum

8

9 Color Additio n Mixing Light

10 If I mix red and blue, I will get... a)brown b)yellow c)magenta d)cyan

11 Red + Blue = Magenta!

12 If I mix red and green, I will get... a)brown b)yellow c)magenta d)cyan

13 Red + Green = Yellow

14 If I mix blue and green, I will get... a)brown b)yellow c)magenta d)cyan

15 Blue + Green = Cyan

16 Yellow Magenta Cyan Green Red Blue

17 += += +=

18 The Additive Primary Colors Blue RedGreen R B G

19

20 += += +=

21 White Light

22 White Light

23 White Light ?

24 White LightYellow Light

25 White Light Yellow Light Yellow = Red + Green

26 White Light Yellow Light Yellow = Red + Green

27 Yellow and Blue are complimentary

28 Yellow and Blue are complimentary If you add yellow light and blue light, you get white light +=

29 +=

30 += +=+

31 Yellow Magenta Cyan Green Red Blue

32 Complimentary colors and

33 Color Subtractio n Mixing Pigments

34 The Subtractive Primary Colors Yellow CyanMagenta C Y M

35 White LightYellow Light Yellow dye absorbs all colors EXCEPT yellow

36 White Light Yellow Light = Red + Green Yellow dye absorbs all colors EXCEPT yellow

37 White Light Yellow Light = Red + Green Yellow dye absorbs all colors EXCEPT yellow

38 White Light cyan dye absorbs all colors EXCEPT cyan Cyan Light

39 White Light cyan dye absorbs all colors EXCEPT cyan Cyan Light = Blue + Green

40 White Light yellow dye + cyan dye leaves ??? green!

41 ue Green Blue Red Yellow Cyan Magenta

42

43 wavelength  (nm) Gamma rays X-rays Ultra- violet Infrared Micro- wave EHFEHF SHFSHF UHFUHF VHFVHF HFHF MFMF LFLF ELF 400 nm500 nm600 nm 700 nm The Electromagnetic Spectrum

44 Yellow Magenta Cyan Green Red Blue

45 ue Green Blue Red Yellow Cyan Magenta

46 Complimentary colors and

47 The National Science Foundation Center for Materials Research & Analysis Center for Electro-Optics Center for BioTechnology Department of Physics & Astronomy Department of Chemistry Department of Electrical Engineering Thanks To

48 White Light red dye absorbs all colors EXCEPT red

49 White Light green dye absorbs all colors EXCEPT green

50 White Light red dye + green dye absorbs ??? all colors!

51 White Light cyan dye + green dye absorbs ???

52 White Light cyan dye + green dye absorbs ???