Windows Tutorials - Herong's Tutorial Examples - v5.62, by Dr. Herong Yang
Comparing JPEG Low Quality Levels
This section provides a quick comparison of image quality of JPEG image files with some lower compression quality levels 75%, 50%, and 25%.
After comparing JPEG images with high compression quality levels: 95%, 90% and 85%, I want to look at some lower levels: 75%, 50% and 25%.
1. Open GIMP-Red-Gradient-Spiral.xcf and save it as GIMP-Red-Gradient-Spiral_075.jpg in JPEG format with a 75 quality level.
2. Open GIMP-Red-Gradient-Spiral.xcf and save it as GIMP-Red-Gradient-Spiral_050.jpg in JPEG format with a 50 quality level.
3. Open GIMP-Red-Gradient-Spiral.xcf and save it as GIMP-Red-Gradient-Spiral_025.jpg in JPEG format with a 25 quality level.
4. Open all JPEG files with Microsoft Paint and view them in Zoom/Large Size mode. We can do comparison of different JPEG quality levels now:
Obviously, lower JPEG quality levels give us very poor quality images.
Of course, lower JPEG quality level results smaller image file size:
1,443 GIMP_Red_Gradient_Spiral_025.jpg
1,928 GIMP_Red_Gradient_Spiral_050.jpg
2,603 GIMP_Red_Gradient_Spiral_075.jpg
10,914 GIMP_Red_Gradient_Spiral_100.jpg
Table of Contents
Introduction to Microsoft Windows
Introduction to Windows Explorer
Introduction to Internet Explorer
"Paint" Program and Computer Graphics
GIMP - GNU Image Manipulation Program
►JPEG Image File Format Quality and Size
Saving Images in JPG/JPEG Format
Saving Images in BMP (Windows Bitmap) Format
Comparing File Sizes of Image File Formats
Comparing JPEG High Quality Levels
►Comparing JPEG Low Quality Levels
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