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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.

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Upcoming deadlines
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


Final exam
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.


Final exam1
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


Homework 13
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).


Stereo 3d photos with photoshop
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).


Stereo 3d photos with photoshop1
Stereo 3D Photos with PhotoShop

Uncheck the Red Channel

Select Right Eye Layer


Homework 131
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)


Survey question
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.)


Review question
Review Question

Which path does light ray take after entering the water?

  • Path A

  • Path B

  • Path C

  • Path D

D

A

C

B


Law of refraction
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)


Review question1
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?


Total internal reflection
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




Wavelengths photons

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).


Demo spectrometer
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 



Newton s color wheel
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


Additive color wheel

There are No Photons of These Colors

Spectral

Colors

Additive Color Wheel

R

M

Y

Red

Yellow

Green

Cyan

Blue

Magenta

G

B

C


Adding color lights
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


Simple trichromatic theory
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


Trichromatic seeing yellow
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


Seeing yellow
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





The ear vs the eye
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.


Trichromatic seeing magenta
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


Maxwell color disk
Maxwell Color Disk

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





Trichromatic two is not enough
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


Mixing blue red paint
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


Trichromatic seeing white
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


Maxwell color disk1
Maxwell Color Disk

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






Value brightness
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


Saturation
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


Hue saturation value
Hue, Saturation, Value

Color wheel is not

a single wheel but

stack of wheels

that range in

value.

Saturation

Hue

Value


Photoshop color picker
Photoshop Color Picker

Value

Saturation

Hue


Saturation value
Saturation & Value

As lighting conditions change, value and saturation usually vary together.

High Value andLow Saturation

Low Value andHigh Saturation

Value

Value

Saturation

Saturation


Trichromatic color blindness
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?


Color blindness
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?


Color and value
Color and Value

Henri Matisse, Woman With Hat, 1904-5


Color and value1
Color and Value

Which of these two versions looks better to you? (SQUINT)




Trichromatic after image
Trichromatic: After-Image

Trichromatic theory also explains seeing after-images.

Yawn.

Yawn.

I’M EXCITED!

First stare at RED

Only Greg and Biff are excited; what color is seen?

I’M EXCITED!

I’M EXCITED!

  • Yellow

  • Magenta

  • C) Cyan

  • D) Orange

Would be excited, but tired.

Then stare at WHITE


Trichromatic after image1
Trichromatic: After-Image

Trichromatic theory also explains seeing after-images.

Yawn.

Yawn.

I’M EXCITED!

First stare at RED

Only Greg and Biff are excited; what color is seen?

I’M EXCITED!

I’M EXCITED!

  • Yellow

  • Magenta

  • C) Cyan

  • D) Orange

Would be excited, but tired.

Then stare at WHITE


Negative after image
Negative After-image

Stare, unfocused, at the red cross for 10 seconds then look at white wall



Negative after image2
Negative After-image

Stare, unfocused, at the flag for 10 seconds then look at white wall


Negative after image3
Negative After-image

Yellow

Cyan

Magenta


Negative after image4
Negative After-image

X

From Practical Light and Color



Trichromatic opponency
Trichromatic: Opponency

Oh, Shut The F*@% Up!

Yellow &

Red

photons excite me. I’M EXCITED

Yellow, Green &

Cyan photons excite me.

I’M EXCITED

Shine Red & Green photons (or Yellow photons)

Yellow seen when Greg and Roy are excited, which can annoy Biff, who then opposes them.


Simultaneous contrast
Simultaneous Contrast

The green circles are identical in hue, saturation, and value. That is, they’re exactly the same color.

The bright yellow background makes the green circle look slightly darker and bluer.

The dark cyan background makes the green circle look slightly lighter and yellower.


Simultaneous contrast1
Simultaneous Contrast

The green circles are identical in hue, saturation, and value. That is, they’re exactly the same color.

The bright yellow background makes the green circle look slightly darker and bluer.

The dark cyan background makes the green circle look slightly lighter and yellower.


Color vision in the eye
Color Vision in the Eye

Three types of cones (color)

One type of rod (B/W only)


Human color vision
Human Color Vision

The human eye is not a perfect optical instrument so attempts to create color systems with geometrically perfect wheels or triangles are misguided.


Maxwell s color triangle
Maxwell’s Color Triangle

J.C. Maxwell formulated the trichromatic theory for colors in terms of a color triangle.

But this construction is not accurate.


Cie hue saturation diagram
CIE Hue-Saturation Diagram

Eye is not a perfect

optical instrument.

Color “wheel” is

actually distorted

cone shape.

Rim is full saturation,

center is white

Greg %

50% Ron

50% Greg

0% Biff

33% Ron

33% Greg

33% Biff

Ron %


Gamut of color
Gamut of Color

Outer “horseshoe” shape is the gamut of colors which the human eye can distinguish.

Inner triangle is the gamut of colors that may be created using just three spectral wavelengths.


Why is orange special
Why is Orange Special?

Peak sensitivities of green and red cone are close together, so we easily separate colors in this range. The human eye evolved this way to spot ripe fruit and …

La Victoria Hot Sauce


Next lecture 3d stereoscopic imaging

Next Lecture3D stereoscopic imaging

Please return the spectrometers & clickers!


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