Setting optimization options for JPEG format

JPEG is the standard format for compressing continuous-tone images such as photographs. (See About JPEG format.)

To optimize an image in JPEG format:

1 Choose JPEG for the optimization format.

2 Do one of the following to specify the compression quality:

The higher the Quality setting, the more detail is preserved in the optimized image. However, using a high Quality setting results in a larger file size than using a low Quality setting. View the optimized image at several quality settings to determine the best balance of quality and file size.

3 To create an enhanced JPEG with a slightly smaller file size, select Optimized. The Optimized JPEG format is recommended for maximum file compression; however, some older browsers do not support this feature.

4 Select Progressive to create an image that displays progressively in a Web browser. The image will display as a series of overlays, enabling viewers to see a low-resolution version of the image before it downloads completely.

Progressive JPEGs require more RAM for viewing, and are not supported by some browsers.

5 To preserve the ICC profile of the image with the file, select ICC Profile.

ICC profiles are used by some browsers for color correction. The ICC profile preserved depends on your current color setting. (See Using color management.)

6 If the original image contains transparency, select a Matte color that matches the background of your Web page. (See Making transparent and matted images.)

Optimizing Images for the Web > Optimizing images > Setting optimization options for JPEG format