digital media lecture 7: color part 2 georgia gwinnett college school of science and technology dr....
TRANSCRIPT
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Digital Media
Lecture 7: Color part 2
Georgia Gwinnett CollegeSchool of Science and Technology
Dr. Jim Rowan
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Refer to Supplemental text:
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You have a blue ball and walk into a room lit with a red light. What color is the ball while in the room?
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Color Models other than RGB
CMYK– cyan– magenta– yellow– key (black)
HSV, HSB, HSL– Hue– Saturation – value. brightness, lightness
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Colored light shining on a white surface
One red light, one blue light and one green light…
Arranged to overlap… Creating Cyan, Magenta and Yellow and… White
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Cyan = Green + BlueCyan = White - Red
Yellow = Red + GreenYellow = White - Blue
Magenta = Red + BlueMagenta = White - Green
This color model can be used as an Additive model appropriate for use with light
This color model can also be used as a Subtractive model appropriate for use with ink and paint... things that absorb light
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White = Red + Green + Blue
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white paper
white paper cyan ink
magenta ink
white light
removes green
removes redwhite light
white light
removes green
removes red
leavingblue light
magentaleaving
light
magentaleaving
lightcyanleaving
light
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CMYK model
Cyan Magenta Yellow Key (black)
– While you should be able to make black by mixing Cyan, Magenta and Yellow…
– Paint (and ink) is not perfect
Subtractive model Used by the printing industry
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HSV model
Another way of looking at color Hue
– The color described as degrees from red Saturation
– How pale the color is– Think of it as adding white to the color
Brightness– How intense the color is– Thinks of it as adding black to the color
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Adjusting the Hue
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Adjusting the Hue
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Adjusting the Hue
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Adjusting the Hue
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Adjusting the Saturation
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Adjusting the Value
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Full-On Red in RGB model
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Full-On Green in RGB model
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Full-On Blue in RGB model
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The transition from B&W to Color TV
B&W just needs intensity changes to make white-gray-black– intensity varies as the electron beam is drawn across the screen
Color is RGB+Intensity for each– could transmit each color with its intensity and it would work for
color tv but– can’t use the same signal model for color because the B&W tv’s
wouldn’t work– Solution: Transmit the necessary color information during the
retrace.– Color is transmitted as luminance and two colors– B&W tv’s simply ignore it because the beam is off
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RGB RGB RGB
RGB RGB RGB
RGB RGB RGB
B B B
B B B
B B B
G G G
G G G
G G G
R R R
R R R
R R R
• Allows the use of the brightness and contrast of each individual color to be manipulated using levels and curves
• Allows a very fine level of control
• Very time consuming• Color balance, hue and
saturation adjustments on the whole image is a shortcut
RGB
Channels
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http://en.wikipedia.org/wiki/Channel_(digital_image)
Channels
Red Green
Blue
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