Pixel resolution
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Pixel resolution Presentation Transcript

  • 1. PIXEL RESOLUTION DIMENSIONS = Width x Height in Pixels DENSITY = Pixels Per Inch = ppi
    • Screen Resolution
    • Monitor Resolution
    • Bit Resolution
    • Image Resolution
    • Scanning Resolution
    • Printing Resolution
  • 2. Image Resolution
    • Detail of digital image measured in Pixels.
    • Dimension W x H in pixels
    • Density Pixels per inch = ppi
  • 3. Screen Resolution
    • Screen resolution refers to the number of pixels a screen can display within a given area.
    • Screen resolution is usually expressed in pixels per linear inch of screen.
    • Most personal computer displays have resolutions that vary from 72 to 96 pixels per inch (ppi).
    • Images for Web pages are always limited by the resolution of the computer screen. Thus a square GIF graphic of 72 by 72 pixels will be approximately one inch square on a 72-ppi display monitor.
  • 4. Screen ppi Print dpi
  • 5. Scanning Resolution
    • To be determined by the OUTPUT DEVICE
    • Target Resolution for Screen - 72 - 96 ppi
    • Target Resolution for Halftone Output Device/Printer i.e. Imager setter, Laser Printer
    • 2 X line Screen (Lines Per Inch - lpi)
    • 85 lpi - Big Dots
    • Newspapers, Comic Books
    • 120 lpi Fair Resolution
    • Posters, flyers
    • 150 lpi Medium - Good Resolution
    • Brochures, Magazines
    • 200 lpi Excellent high quality
    • Art Books, High end mag
  • 6. Bit Resolution
    • The # of bits of INFORMATION per pixel
    • Determines how many colors can be displayed at one time on the screen.
    • Greater pixel depth means more available colors
    • and more accurate color
    • 1 bit color = 2 values - black / white
    • 8 bit color = 256 values of color
    • 24 bit color = 16.4 million values of color
    • 32 bit color = millions
  • 7. 1 Bit RESOLUTION
    • The simplest form a black-and-white computer displays, a single bit of memory is assigned to each pixel.
    • Because each memory bit is either positive or negative (0 or 1), a 1-bit display system can manage only two colors (black or white) for each pixel on the screen
  • 8. 8 Bit Resolution
    • 8 bits of memory are dedicated to each pixel
    • It could be one of 256 colors. (256 = 2 to the eighth power; in other words, 256 is the maximum number of unique combinations of zeros and ones you can make with 8 bits.)
    • This kind of computer display is called an "8-bit" or "256-color" display
  • 9. 24 Bit Resolution
    • 24-bit or "True-color" displays can show millions of unique colors simultaneously on the computer screen.
    • True-color images are composed by dedicating 24 bits of memory to each pixel
    • 8 each for the red, green, and blue components
    • (8 + 8 + 8 = 24):