2. WHAT IS PIXEL
A pixel is the basic logical unit in digital graphics.
Pixels are combined to form a complete
image, video, text or any visible thing on a
computer display.
The pixel resolution also determines the quality
of display; more pixels per inch of monitor
screen yields better image results.
3. ASPECT RATIO
The aspect ratio refers to the proportions of the
height and width of an image.
It is represented as W:H (W is the width and H
is the height).
Usually Aspect Ratio are 4:3 , 8:6, 16:9
4. FRAME BUFFER
A frame buffer is a portion of RAM containing
a bitmap that drives a video display. It is
a memory buffer containing a
complete frame of data.
6. Raster Images
Raster Images are called as Bitmap Images.
Bitmap Images uses a grid of individual pixels
where each pixel represents different colors.
7. RANDOM SCAN
It uses mathematical equations for connecting
lines to describe an image.
8. DIFFERENCE BETWEEN RASTER AND
RANDOM
RASTER SCAN RANDOM SCAN
It has poor or less Resolution because
picture definition is stored as a intensity
value
It has High Resolution because it stores
picture definition as a set of line
commands.
It is less expensive than Random Scan
System
It is Costlier than Raster Scan System.
It uses Pixels along scan lines for drawing
an image.
It uses various mathematical function to
draw.
Zig – Zag line is produced because plotted
value are discrete.
Smooth line is produced because directly
the line path is followed by electron beam
It Stores picture definition in Refresh
Buffer also called Frame Buffer.
It Stores picture definition as a set of line
commandscalled Refresh Display File.
Refresh rate is 60 to 80 frame per second. Refresh rate is 30 to 60frame per second.
