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

2. 724421 2 Technology Multimedia 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

3. 724421 3 Technology Multimedia Types of Images Raster Image

4. 724421 4 Technology Multimedia Types of Images Vector Image (x min,y min ) (x max,y max ) Object Rectan01 Pivot center Data (x min,y min,x max,y max ) Rectangular (x min,y min,x max,y max ) begin lineto (x min,y min,x max,y min ) lineto (x max,y min,x max,y max ) lineto (x min,y min,x min,y max ) lineto (x min,y max,x max,y max ) end end object

5. 724421 5 Technology Multimedia Types of Images From vector to raster display system

6. 724421 6 Technology Multimedia Displaying Image in Computer Cathode-Ray Tubes and LCD panel

7. 724421 7 Technology Multimedia Displaying Image in Computer Source of color

8. 724421 8 Technology Multimedia Displaying Image in Computer Source of color in CRT

9. 724421 9 Technology Multimedia Displaying Image in Computer Color Mixing in RGB model

10. 724421 10 Technology Multimedia Displaying Image in Computer Raster scan display system

11. 724421 11 Technology Multimedia Displaying Image in Computer Raster scan display system

12. 724421 12 Technology Multimedia Displaying Image in Computer Color Raster scan display system

13. 724421 13 Technology Multimedia Displaying Image in Computer Raster scan display system

14. 724421 14 Technology Multimedia 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

15. 724421 15 Technology Multimedia Type of color display system True Color system N M Bit depth Video controller CRT

16. 724421 16 Technology Multimedia 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 1 Byte

17. 724421 17 Technology Multimedia Type of color display system Index Color system x y 50 1 0 1 0 0 1 Color Table R GB 0 255 0 0 010010100100111100011010 50 3 colors x 8 bits/column = 24 bits D/A y x 8 bits Frame Buffer

18. 724421 18 Technology Multimedia 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

19. 724421 19 Technology Multimedia How to display an image file(1) BMP indexed file structure

20. 724421 20 Technology Multimedia How to display an image file(2) Step 1 Load image information

21. 724421 21 Technology Multimedia How to display an image file(3) Step 2 Load color index to video pallet

22. 724421 22 Technology Multimedia How to display an image file(4) Step 3 Load pixel information by lookup color pallet