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

 Outdated Tutorials

 References

 PDF Printing Version