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Chapter 15. JPEG Format > Minimizing JPEG File Size

15.7. Minimizing JPEG File Size

As for all files intended for Web delivery, it is important to optimize JPEGs to make them as small as possible. Because JPEGs are always 24-bit by nature, reducing bit-depth is not an option. For the most part, all you have to play with is the quality setting, however, it is possible to prepare an image prior to compression. There are a number of specialized tools available for making JPEGs as small as they can be while letting you make decisions about image quality.

15.7.1. Aggressive Compression Ratios

If your image has a lot of continuous tone or gradient colors, you can be pretty aggressive with the compression level and not worry too much about loss of quality in the resulting JPEG. Even at some of the lowest quality settings, (0 or 1 in Photoshop, 20-30 on the standard scale) the image quality is still suitable for viewing on web pages.


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