Pixel resolution


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Pixel resolution

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