A Complete Guide to Web Design

290 Chapter 15 – JPEG Format

Minimizing JPEG File Size

Web Design in a Nutshell, eMatter Edition

Once you’ve set the Detail slider to match the general quality of the image, you

can experiment with various amounts of blur using the Strength slider. This is not

a scientific process—it’s a matter of finding the point at which you are comfort-

able with the image quality while minimizing the file size.

Always apply the prefilters first (that’s why they’re called “pre” filters), because the

optimization tables and compression ratios will be based on these settings. After

applying the filters and optimization, you may be able to reduce the compression

Q-setting a bit without noticeable change in image quality.