Dots, Pixels, Colors and Resolution
This section provides quick introductions of some basic graphics concepts: dot, pixel, color, and resolution.
A computer graphics is organized as a matrix of rows and columns of dots.
Each dot carries a color value.
The resolution of a graphics is measured by 3 parameters:
1. Horizontal resolution: The number dots within an inch in the horizontal direction.
2. Vertical resolution: The number dots within an inch in the vertical direction.
3. Color resolution: The number of colors supported on a dot.
For example, if a graphics of 5 inches by 3 inches is stored in computer with a resolution of
72 DPI (Dots Per Inch) in both directions and 256 colors per dot, it will be stored with a matrix
3 x 72 = 216 rows and 5 x 72 = 360 columns of dots. A color value in the range of 0 and 255 is used
on each dot.
A dot is also called pixel, a short name for pic-ture el-ement.
The size of a computer graphics can be easily calculated by its pixel size and number of colors,
if it is stored without any compression.
For example, the file size of a graphics of 360x216 pixels and 256 colors will be 360 x 216 x 8 bits
= 77,760 bytes.
Last update: 2013.
Table of Contents
About This Book
Introduction to Microsoft Windows
Introduction to Windows Explorer
Introduction to Internet Explorer
►"Paint" Program and Computer Graphics
Introduction to "Paint" - The Simplest Graphics Tool
►Dots, Pixels, Colors and Resolution
Reducing the Size of a Picture File
Converting File Format from GIF to JPG/JPEG
GIMP - GNU Image Manipulation Program
JPEG Image File Format Quality and Size
GIF Image File Format and Transparent Background
"WinZip" - ZIP File Compression Tool
"WinRAR" - RAR and ZIP File Compression Tool
FTP Server, Client and Commands
"FileZilla" - Free FTP Client and Server
Web Server Log Files and Analysis Tool - "Analog"
Spyware Adware Detection and Removal
IE Addon Program Listing and Removal
Vundo (VirtuMonde/VirtuMundo) - vtsts.dll Removal
Trojan and Malware "Puper" Description and Removal
VSToolbar (VSAdd-in.dll) - Description and Removal
Spybot - Spyware Blocker, Detection and Removal
Setting Up and Using Crossover Cable Network
Home Network Gateway - DSL Modem/Wireless Router
Windows Task Manager - The System Performance Tool
"tasklist" Command Line Tool to List Process Information
"msconfig" - System Configuration Tool
Configuring and Managing System Services
Windows Registry Key and Value Management Tools
Startup Programs Removal for Better System Performance
Winsock - Windows Sockets API
Java on Windows
Glossary of Terms
PDF Printing Version