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Multimedia Technology: Understanding Types and Display of Images

Explore raster and vector images, color systems, display technologies, and bit depth in multimedia technology. Learn how to display image files step by step.

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Multimedia Technology: Understanding Types and Display of Images

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  1. Multimedia Image Technology Technology Krich Sintanakul 271430 Multimedia and Hypermedia

  2. Technology Types of Images • Raster Image • Digitize or sampling from the real world • Store in bitmap orientation • Need large storage and High compression • Edit by retouching tool • Vector Image • Synthesized image • Store in object structure list (Smaller) • Reusable , Scalable , Animating • No stair problem Multimedia

  3. Technology Types of Images • Raster Image Multimedia

  4. Technology Types of Images • Vector Image Multimedia • Object Rectan01 • Pivot center • Data (xmin,ymin,xmax,ymax) • Rectangular (xmin,ymin,xmax,ymax) • begin • lineto (xmin,ymin,xmax,ymin) • lineto (xmax,ymin,xmax,ymax) • lineto (xmin,ymin,xmin,ymax) • lineto (xmin,ymax,xmax,ymax) • end • end object (xmin,ymin) (xmax,ymax)

  5. Technology Types of Images • From vector to raster display system Multimedia

  6. Technology Displaying Image in Computer • Cathode-Ray Tubes and LCD panel Multimedia

  7. Technology Displaying Image in Computer • Source of color Multimedia

  8. Technology Displaying Image in Computer • Source of color in CRT Multimedia

  9. Technology Displaying Image in Computer • Color Mixing in RGB model Multimedia

  10. Technology Displaying Image in Computer • Raster scan display system Multimedia

  11. Technology Displaying Image in Computer • Raster scan display system Multimedia

  12. Technology Displaying Image in Computer • Color Raster scan display system Multimedia

  13. Technology Displaying Image in Computer • Raster scan display system Multimedia

  14. Technology Type of color display system • True Color system • 24/16 Bits each pixel • 3/2 Bytes per pixel • Keep Color intensity in Frame buffer • Index Color system • 8 bits (1 byte) per pixel • Display 256 from index table at a time • Keep address of table in Frame buffer Multimedia

  15. Technology Bit depth Video controller CRT N M Type of color display system • True Color system Multimedia

  16. Technology 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte Type of color display system • True Color system • VGA 24 Bits 640*480 = 307200 Pixels = 921600 Bytes • VGA 16 Bits 640*480 = 307200 Pixels = 614400 Bytes • SVGA 24 Bits 800*600 = 480000 Pixels = 1440000 Bytes • SVGA 16 Bits 800*600 = 480000 Pixels = 960000 Bytes Multimedia

  17. Technology Type of color display system • Index Color system Color Table 8 bits Frame Buffer G B R Multimedia 255 x D/A x D/A 0 1 0 D/A 0 1 1 50 0 01001010 01001111 00011010 y 0 y 50 0 3 colors x 8 bits/column = 24 bits

  18. Technology Type of color display system • Index color system • VGA 256 Color 640*480 = 307200 Pixels = 307200 Bytes Index table 256*3 (24 bits) 768 Bytes Total 307200 + 768 = 307968 Bytes • SVGA 256 Color 800*600 = 480000 Pixels = 480000 Bytes Index table 256*3 (24 bits) 768 Bytes Total 480000 + 768 = 480768 Bytes • SVGA 256 Color 1024*768 = 786432 Pixels = 786432 Bytes Index table 256*3 (24 bits) 768 Bytes Total 786432 + 768 = 787200 Bytes Multimedia

  19. Technology How to display an image file(1) • BMP indexed file structure Multimedia

  20. Technology How to display an image file(2) • Step 1 Load image information Multimedia

  21. Technology How to display an image file(3) • Step 2 Load color index to video pallet Multimedia

  22. Technology How to display an image file(4) • Step 3 Load pixel information by lookup color pallet Multimedia

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