Appendix D - Image Quality

This appendix is provided as a quick reference of image quality capabilities of each graphic file format.

It also displays the 3 main types of formats if there is a question about browser compatability with a format (most notably PNG).

A more in-depth approach is taken in Appendix E: The Image Lab.

Graphic File Format Samples
Graphic	Description
Image info: Resolution: 72 dpi Color info: 8-bit Indexed Color Space
Image info: Resolution: 72 dpi Color space: 24-bit RGB Color Space
Image info: Resolution: 72 dpi Color space: 24-bit RGB Color Space

The table below displays samples of each common format with some different settings.

Examples Of Each Graphic File Format
File type: PNG (compression not yet implemented)	File type: JPEG Image quality: Excellent Compression: Fair
File type: JPEG Image quality: Good Compression: Good	File type: JPEG Image quality: Fair Compression: Excellent
File type: GIF 256 Colors	File type: GIF 128 Colors
File type: GIF 64 Colors	Notes: The PNG file and the JPG files with excellent image quality both begin to introduce a pattern in the sky. The JPG file with fair image quality is pixelatd. The GIF files perform well in this example. However, notice the quality of the sky in the upper right corner. As number of colors decrease, so does quality of image