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Internet Graphics. Representing Images. Raster Image : Images consist of “dots” of color, not lines Pixel : Picture element-tiny rectangle Resolution : Number of pixels SVGA: 1280 x 1024 = 1,310,720 VGA: 640 x 480 Your monitor can be modified. Representing Images.

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PowerPoint Slideshow about ' Internet Graphics' - qiana


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representing images
Representing Images
  • Raster Image: Images consist of “dots” of color, not lines
  • Pixel: Picture element-tiny rectangle
  • Resolution: Number of pixels
    • SVGA: 1280 x 1024 = 1,310,720
    • VGA: 640 x 480
    • Your monitor can be modified
representing images1
Representing Images
  • RGB: monitor, each pixel
  • Intensity: 0 (dark) – 255 (bright)
  • Representing Color: # - # - #
    • 255-255-255 = white
    • 100-0-0 = scarlet
    • 16,777,216 = 16 million colors
representing images2
Representing Images
  • Light media: RGB
  • Opaque media: paint
    • Red, blue, yellow
  • Printers
    • Cyan, yellow, magenta
    • Must have conversion software for translating monitor to printer
storage of images
Storage of Images
  • 1 byte = 8 bits = 255 values
  • Images are memory hogs
  • Causes problems with transmission
  • e.g. Image: 5 million pixels = 14 Mb
  • Solutions
    • Less “accuracy”
    • Compression
reducing color depth
Reducing Color Depth
  • Reduce the number of colors
  • Depth: measured by bits/pixel
  • True color = 3 bytes = 24 bits
8 bit color
8-bit Color
  • 1 byte = 8 bits = 256 colors
  • Color Palette – 256 colors
    • Multiple palettes are available
  • 8-bit number represents the particular color in the palette – not the mix of RGB
  • Uses 1/3 storage space + 768 bytes to define the palette
other color depths
Other Color Depths
  • 1-bit - Black & White
  • 4-bit = 16 colors
    • Simple drawings, icons
    • Windows, but can change palette
    • Start; Settings; Control Panel; Display; Appearance; Scheme
color depth tradeoff
Color Depth Tradeoff
  • Color depth vs. Resolution
  • Due to storage requirements, must reduce one
  • 1280 x 1024  256 colors
  • 16 M colors  640 x 480
  • Photos: need more than 256 colors
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