Last Graphics

Raster scan:

 i)monochrome system each bit is 1  or 0 for the corresponding pixel to be on or off---bitmap
ii)for color monitor the frame buffer also contents the color of each pixel as well as other characteristics of the image ----pixmap store in 24 bit
iii)example-tv panel,printers,pc monitor
iv)Refresh rate 24 HZ (1HZ =1 refresh/second)
v)zig-zag line is produced because the plotted value is discrete.
vi)real-life images can be displayed with different shades.

Disadvantages:
i)more time
ii)Low resolution
iii)More memory need than random scan display

video tutorial

Random scan display:

it also is known as a vector, stroke waiting or calligraphic
Advantages:
i)High resolution
ii)Easy animation
iii)Require little memory

Disadvantages:
 i)Require intelligent electron beam
ii)limited screen  density
iii)limited color capability
iv)real-life images can not be displayed

Topic List	Raster Scan Display	Random Scan Display
Display
Resolution	low	high
Electron beam	Left-right moving	Direct display by given point  so it called vector display
Cost	Less expensive	More expensive
Refresh rate	60-80 frame per second	300-60 frame rate per  second
Picture definition storage  area	Frame buffer	Refresh display file
Realism in display	More ralisam because it  uses shade technique.	Less realism it can’t using  shade technique
Image drawing using	Pixel	Line command

CRT: