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

Transcript of Upcoming Deadlines

Uniform Motion

Upcoming DeadlinesHomework #13 Creating Stereoscopic 3D ImagesDue 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.comPlease take a clicker and a spectroscope1Final ExamFinal 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 semesters final exam.

You may bring one page of notes double-sided (or two pages single-sided) to the exam.2Final ExamSample 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 room3Homework #13Creating 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 appearingin the photo and at leastone of theimages should be of a recognizable location on campus.

You will be graded on the composition soplan your scenes to make them interesting (especially for 3D).4Stereo 3D Photos with PhotoShopSteps 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). 5Stereo 3D Photos with PhotoShop

Uncheck the Red ChannelSelect Right Eye Layer6Homework #13Upload 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 oneimage, thenshifting 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)7Survey QuestionFrom which of these assignments did you learn the most:

Term paperHomeworks using TrackerStop-motion animation homeworksHomeworks using MayaOther (reverse reference, etc.)

8Review QuestionWhich path does light ray take after entering the water?

Path A Path B Path C Path D

DCBA9Law 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)10Review QuestionNatural lighting underwater is primarily from overhead because sunlight cannot enter the water at more than about a 45 degree angle.

True or False?

11Total Internal ReflectionTrue.

For the same reason you can only see the sky from underwater when looking up at more than about a 45 degree angle. See skyMirror12Seeing Color

13Spectrum of Visible Light

14Wavelengths & Photons

Red PhotonBlue PhotonGreen PhotonYellow PhotonParticles of light, called photons, each have a wavelength that determines the color we see for that photon.Visible light is roughly from400 nanometers (blue) to 700 nanometers (red).15Demo: SpectrometerSpectrometer separates the wavelengths of light, creating a rainbow that shows you the intensity in each hue (color).

Light bulb Spectrum Long Wavelength Short 16Use Spectrometer17Newtons 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 spectrum18Additive Color Wheel

SpectralColorsThere are No Photons of These ColorsRYBGMCRedYellowGreenCyanBlueMagenta19Adding Color LightsStream of red & green photons looks same as yellow photons(metamerism)

Theatrical lightingorYELLOWEye toBrainNotice overlap of red, green, & blue is seen as white light20

Simple Trichromatic TheoryYellow &Redphotons excite meYellow, Green &Cyanphotons excite meCyan &Bluephotons excite meImagine that inside your eye are these three guys, who send messages to your brain.BIFFGREGRON


Trichromatic: Seeing YellowYellow &Redphotons excite me. IM EXCITEDYellow, Green &Cyan photons excite me.IM EXCITEDCyan & Bluephotons excite me.Yawn.Yellow seen when Ron and Greg are excited, either by yellow photons or red & green photons.OR

RONGREGBIFF22Seeing Yellow

Sodium lamps emit near pure yellow photonsColor 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

23Use Spectrometer24Use Spectrometer25Use Spectrometer26

The Ear vs. The Eye

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

Trichromatic: Seeing MagentaYellow &Redphotons excite me. IM EXCITEDYellow, Green &Cyan photons excite me.Yawn.Cyan & Bluephotons excite me.IM EXCITEDMagenta is seen by eye when Ron and Biff are excited, which no single type of photon can achieve.

RONGREGBIFF28Maxwell Color DiskDisk painted half red, half blue looks magenta when rapidly spinning.29Use Spectrometer30Use Spectrometer31Use Spectrometer32Trichromatic: Two is Not Enough

Blue & Greenphotons excite me.IM EXCITEDGreen & Redphotons excite me.IM EXCITEDORWith only two receptors Green and Magenta look the same.33Mixing Blue & Red PaintMixing paint or ink is different from adding colors together by light.

Mix of blue and red paint produces a blackish brown34

Trichromatic: Seeing WhiteYellow &Redphotons excite me. IM EXCITEDYellow, Green &Cyan photons excite me.IM EXCITEDCyan & Bluephotons excite me.IM EXCITEDWhite seen when all three are very excited;Gray seen when all three less excited35Maxwell Color DiskDisk with blue, green, and red filters looks grayish white when rapidly spinning.36Use Spectrometer37Use Spectrometer38Use Spectrometer39Use Spectrometer40

Value (Brightness)Im a little excitedYawn.Yawn.The level of excitement indicates the value of a color, which is sometimes called the brightness.Yawn.Yawn.IM VERY EXCITED!Dim Red LightBright Red Light41

SaturationIm a little excitedYawn.Yawn.When white light is mixed in with a pure color the eye sees the sum as being less saturated.

Saturation also called chroma.IM VERY EXCITED!Pure Red LightPink LightIm a little excitedIM VERY EXCITED!SaturatedColorUnsaturatedColor42Hue, Saturation, Value

Color wheel is nota single wheel butstack of wheels that range invalue.HueValueSaturation43

Photoshop Color PickerSaturationValue

Hue44Saturation & Value

High Value andLow SaturationLow Value andHigh SaturationAs lighting conditions change, value and saturation usually vary together.ValueSaturationValueSaturation45

Trichromatic: Color BlindnessRed , Yellow, Green &Cyan photons excite me.IM EXCITEDCyan & Bluephotons excite me.Yawn.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?OR46Color BlindnessClassificationIncidence (%)MalesFemalesAnomalousTrichromacy 6.3 0.37 Protanomaly(Red-cone weak)1.30.02Deuteranomaly(Green-cone weak)5.00.35Tritanomaly(Blue-cone weak)0.00010.0001Dichromacy 2.4 0.03 Protanopia(Red-cone absent)1.30.02Deuteranopia(Green-cone absent)1.20.01Tritanopia(Blue-cone absent)0.0010.03Rod Monochromacy(no cones) 0.00001 0.00001

29 or 70?21 or 74?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.47Color and Value

Henri Matisse, Woman With Hat, 1904-548Color and Value

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

50Color and Value


Trichromatic: After-ImageFirst stare at REDIM EXCITED!Yawn.Yawn.Would be excited, but tired.Then stare at WHITEOnly Greg and Biff are excited; what color is seen?YellowMagenta C) CyanD) OrangeIM EXCITED!IM EXCITED!Trichromatic theory also explains seeing after-images.


Trichromatic: After-ImageFirst stare at REDIM EXCITED!Yawn.Yawn.Then stare at WHITEOnly Greg and Biff are excited; what color is seen?YellowMagenta C) CyanD) OrangeIM EXCITED!IM EXCITED!Trichromatic theory also explains seeing after-images.Would be excited, but tired.53Negative After-imageStare, unfocused, at the red cross for 10 seconds then look at white wall54Negative After-imageCyan55Negative After-imageStare, unfocused, at the flag for 10 seconds then look at white wall56Negative After-imageCyanMagentaYellow57Negative After-image

From Practical Light and ColorX58Negative After-image


Trichromatic: OpponencyYellow &Redphotons excite me. IM EXCITEDYellow, Green &Cyan photons excite me.IM EXCITEDOh, Shut The F*@% Up!Yellow seen when Greg and Roy are excited, which can annoy Biff, who then opposes them.Shine Red & Green photons (or Yellow photons)60Simultaneous ContrastThe bright yellow background makes the green circle look slightly darker and bluer.The green circles are iden