announcements 4/9/12 prayer roy g. biv - (2:41) hw 26 due today (but
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Announcements 4/9/12 Prayer Roy G. Biv - http://www.youtube.com/watch?v=Gf33ueRXMzQ (2:41)
HW 26 due today (but it’s very likely Claira won’t pick it up until Thursday night. Shhh!)
Exam 3 – Should be graded/entered by end of today Final Exam: My apologies, can’t take it in the Testing
Center. Scheduled exam date/time: Tues Apr 17, 3-6 pm. a. Any conflicts?b. Start at 2 pm?c. Some detailed info on the problems…
Foxtrot
Reading Quiz Just kidding
The Goal
Worked Example
X = Y = Z =
Normalize (because “color” should not depend on overall intensity) x = y = z =
xyY
Another Worked Example
What is (x,y) for a delta function at 560 nm?
My estimates:X = 0.59Y = 0.98Z = 0
x = .38y = .62
Do that for every wavelength the “locus” curve
Chromaticity DiagramThings to observe The locus
Example: 560 nm (0.38, 0.62)
The white point = (0.33, 0.33)
Basic color mixing (blue + green = cyan, etc.)
“Line of purples” Linearity: more
advanced combining colors
Complementary colors (can mix to get white)
sRGB
“blue” = (0.15, 0.06)
“red” = (0.65, 0.33)
“green” = (0.30, 0.60)
(If xyY is specified, must first transform to XYZ)
sRGB
“blue” = (0.15, 0.06)
“red” = (0.65, 0.33)
“green” = (0.30, 0.60)
Mixing three sources: triangle
“Gamut”
On the advantages of monochromatic sources
“green” = (0.30, 0.60)
“red” = (0.65, 0.33)
“blue” = (0.15, 0.06)
What’s the Color of Blackbody Radiation?
Wikipedia “Color Temperature”
K 5000K 2000K 1000K
The Sun
The Sun
Color of the Sun?
The Sun
“Stop It”
For a given (x,y) point Dominant color
(hue), D
Saturation (purity), P
Complement color, C
What about this point?
Summary: Ways to Specify Color
R,G,B (original color matching functions) X,Y,Z x,y,Y hue, saturation, Y (“hue, brightness,
saturation”) sRGB R,G,B coordinates (if in sRGB gamut)
That’s All, Folks
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