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    test 1 test 1 Presentation Transcript

    • C O L O R
        • In Multimedia Applications …
    • The Science of Light
      • Light is electromagnetic energy
      • Produced by atoms
      • Exists in a range of frequencies
      • The visible range is COLOR
    • What is Color?
      • The visible range of light
      • A continuum:
        • Red
        • Orange
        • Yellow
        • Green
        • Blue
        • Violet
      • Black is absence of color
      • White is presence of all colors
    • Human Color Perception
      • Light rays stimulate nerves
      • Receptors are sensitive to red, green, and blue light
      • Can interpret thousands of combinations
    • Screen Colors
      • An additive process of combining colored light made of 3 primary colors:
        • Red
        • Green
        • Blue
      • Each pixel displays a single color with a specific RGB number
    • Print Colors
      • A subtractive process of combining colored inks that reflect light:
      • Each printed dot is made up of 3 primary colors:
        • Cyan
        • Magenta
        • Yellow
    • Color Models
      • There are several models to describe colors with a computer:
        • RGB
        • CMYK
        • HSB/HSL
        • Others
    • RGB
      • Set red, green and blue to values in the range of 0 to 255
      • All colors are expressed as a combination of those 3 values
    • CMYK
      • Used for print media
      • Colors are mixed with different values of:
        • Cyan
        • Magenta
        • Yellow
        • Black
    • HSB/HSL
      • Hue is specified as an angle from 0 to 360 degrees
      • Saturation and Brightness/Lightness are specified as percentages
        • O% saturation is without color
        • 50% lightness/brightness is a pure color (no black or white)
    • Other Models
      • CIE describes color in terms of frequency, saturation, and illuminance
      • YIQ/YUC are based on luminance and chrominance
      • YCC represents digital information converted from photographic images
    • Monitors
      • Color resolution will vary depending on:
        • Screen resolution
          • 800x600
          • 1024x768
        • Hardware color depth
          • 16 bit
          • 24 bit
          • 32 bit
    • Palettes
      • Tables that define the color of a pixel:
        • 1 bit = 2 colors
        • 4 bits = 16 colors
        • 8 bits = 256 colors
        • 16 bits = 65k colors
        • 24 bits = 16m colors
    • Dithering
      • An image can contain many colors
      • Monitors are limited in the number of colors displayed at once
      • Image colors must be mapped to a palette
    • C O L O R … adds a new dimension
    • RGB Combinations Click to return Black White X X X Cyan X X Magenta X X Yellow X X Blue X Green X Red X Blue Green Red
    • RGB Values Click to return White (255,255,255) Black (0,0,0) Cyan (0,255,255) Magenta (255,0,255) Yellow (255,255,0) Blue (0,0,255) Green (0,255,0) Red (255,0,0)
    • Hue Values Click to return 300 degrees Magenta 240 degrees Blue 180 degrees Cyan 120 degrees Green 60 degrees Yellow 0 degrees Red
    • Combining Colors Click to return