Upcoming Deadlines

1. Upcoming Deadlines Homework #13 – Creating Stereoscopic 3D Images Due Thursday, December 8th (Next week) 20 points (10 points if late) Final Exam - Thursday, December 15th 9:45AM-12:00 Noon in this room. For full schedule, visit course website: ArtPhysics123.pbworks.com Please take a clicker and a spectroscope

2. Final Exam Final Exam will have 10 short essay questions on material covered in lecture. Final exam counts for 50 points. See course website for copy of last semester’s final exam. You may bring one page of notes double-sided (or two pages single-sided) to the exam.

3. Final Exam • Sample Questions: • * What is “drag” in animation? Give an example to illustrate your definition. What physics principle causes “drag” to occur? • * Explain the difference between reflection and refraction. Also give two examples of each. • Final Exam is on: • Thursday, December 15th • 9:45-Noon in this room

4. Homework #13 Creating stereoscopic 3D images. For this assignment you will create at least three different stereoscopic images from photographs. At least one of the images should have you appearing in the photo and at least one of the images should be of a recognizable location on campus. You will be graded on the composition so plan your scenes to make them interesting (especially for 3D).

5. Stereo 3D Photos with PhotoShop • Steps for creating stereo 3D photos in PhotoShop: • Snap a photo, move 3 inches to the right, take a second photo. Avoid having objects closer than a yard away from the camera and no moving objects! • Open both images in PhotoShop. Hold the shift key and drag the right eye image on to left eye image. • Rename the layers “Right Eye” and “Left Eye”; make sure the Right Eye layer is on top. • Double click the Right Eye thumbnail to open the Blending Window. In Advanced Blending uncheck the Red Channel for Red/Cyan glasses (or Green Channel for Green/Magenta glasses).

6. Stereo 3D Photos with PhotoShop Uncheck the Red Channel Select Right Eye Layer

7. Homework #13 Upload your photos to your blog in an entry entitled “Creating Stereoscopic 3D Images” Optional: You can also create a pair of stereo-ready images in Autodesk Maya by rendering a scene for one image, then shifting the camera position and rendering the second image. Bonus Points: Create a 3D animated short, either by stop motion or in Maya. Ten bonus points for a good animation; twenty bonus points for a great one. Due Thur., December 8th -- 20 points (10 points if late)

8. Survey Question From which of these assignments did you learn the most: • Term paper • Homeworks using Tracker • Stop-motion animation homeworks • Homeworks using Maya • Other (reverse reference, etc.)

9. Review Question Which path does light ray take after entering the water? • Path A • Path B • Path C • Path D D A C B

10. Law of Refraction C) Path C Angle is smaller in the denser material. The light ray bends but does not cross the normal (line perpendicular to the surface)

11. Review Question Natural lighting underwater is primarily from overhead because sunlight cannot enter the water at more than about a 45 degree angle. True or False?

12. Total Internal Reflection True. For the same reason you can only see the sky from underwater when looking up at more than about a 45 degree angle. See sky Mirror

13. Seeing Color

14. Spectrum of Visible Light

15. Red Photon Wavelengths & Photons Particles of light, called photons, each have a wavelength that determines the color we see for that photon. Yellow Photon Green Photon Blue Photon Visible light is roughly from400 nanometers (blue) to 700 nanometers (red).

16. Demo: Spectrometer Spectrometer separates the wavelengths of light, creating a rainbow that shows you the intensity in each hue (color). Light bulb Spectrum  Long Wavelength Short 

17. Use Spectrometer

18. Newton’s Color Wheel Prism spectrum is a straight line, so why did Isaac Newton describe color using a circular wheel? This segment is added to join the two ends of the spectrum

19. There are No Photons of These Colors Spectral Colors Additive Color Wheel R M Y Red Yellow Green Cyan Blue Magenta G B C

20. Adding Color Lights Stream of red & green photons looks same as yellow photons (metamerism) YELLOW Eye to Brain or Notice overlap of red, green, & blue is seen as white light Theatrical lighting

21. Simple Trichromatic Theory Yellow, Green & Cyan photons excite me Yellow & Red photons excite me Imagine that inside your eye are these three guys, who send messages to your brain. Cyan & Blue photons excite me GREG RON BIFF BIFF RON GREG

22. Trichromatic: Seeing Yellow Yellow, Green & Cyan photons excite me. I’M EXCITED Cyan & Blue photons excite me. Yawn. Yellow & Red photons excite me. I’M EXCITED OR GREG Yellow seen when Ron and Greg are excited, either by yellow photons or red & green photons. RON BIFF

23. Seeing Yellow Sodium lamps emit near pure yellow photons Color monitor can only emit red, green, and blue (RGB); creates other colors by selectively turning RGB pixels on or off. “Electric pickle” is also a sodium light

24. Use Spectrometer

25. Use Spectrometer

26. Use Spectrometer

27. The Ear vs. The Eye How the ear senses sound waves is distinct from how the eye senses light waves. E D A Hearing an E and a D together does not sound like an A. Seeing green and red together does look like yellow light.

28. Trichromatic: Seeing Magenta Cyan & Blue photons excite me. I’M EXCITED Yellow, Green & Cyan photons excite me. Yawn. Yellow & Red photons excite me. I’M EXCITED Magenta is seen by eye when Ron and Biff are excited, which no single type of photon can achieve. GREG RON BIFF

29. Maxwell Color Disk Disk painted half red, half blue looks magenta when rapidly spinning.

30. Use Spectrometer

31. Use Spectrometer

32. Use Spectrometer

33. Trichromatic: Two is Not Enough With only two receptors Green and Magenta look the same. Blue &Green photons excite me. I’M EXCITED Green &Red photons excite me. I’M EXCITED OR

34. Mixing Blue & Red Paint Mixing paint or ink is different from adding colors together by light. Mix of blue and red paint produces a blackish brown

35. Trichromatic: Seeing White Cyan & Blue photons excite me. I’M EXCITED Yellow, Green & Cyan photons excite me. I’M EXCITED Yellow & Red photons excite me. I’M EXCITED White seen when all three are very excited; Gray seen when all three less excited

36. Maxwell Color Disk Disk with blue, green, and red filters looks grayish white when rapidly spinning.

37. Use Spectrometer

38. Use Spectrometer

39. Use Spectrometer

40. Use Spectrometer

41. Value (Brightness) Yawn. The level of excitement indicates the value of a color, which is sometimes called the brightness. Yawn. I’m a little excited Dim Red Light Yawn. Yawn. I’M VERY EXCITED! Bright Red Light

42. Saturation I’M VERY EXCITED! When white light is mixed in with a pure color the eye sees the sum as being less saturated. Saturation also called chroma. Yawn. Yawn. Saturated Color Pure Red Light I’m a little excited I’m a little excited I’M VERY EXCITED! Pink Light Unsaturated Color

43. Hue, Saturation, Value Color wheel is not a single wheel but stack of wheels that range in value. Saturation Hue Value

44. Photoshop Color Picker Value Saturation Hue

45. Saturation & Value As lighting conditions change, value and saturation usually vary together. High Value andLow Saturation Low Value andHigh Saturation Value Value Saturation Saturation

46. Trichromatic: Color Blindness Cyan & Blue photons excite me. Yawn. Red , Yellow, Green & Cyan photons excite me. I’M EXCITED OR Color blindness occurs if the eye is missing one of the three receptors. The other receptors try to compensate but cannot distinguish some colors. Do I see red or green?

47. Color Blindness Weakness or absence of one of the three types of cones is the cause of color blindness, leading to a reduced ability to distinguish colors. 29 or 70? 21 or 74?

48. Color and Value Henri Matisse, Woman With Hat, 1904-5

49. Color and Value Which of these two versions looks better to you? (SQUINT)

50. Color and Value