Adobe Illustrator CS3 User Manual download pdf (Page 392)

ILLUSTRATOR CS3

User Guide

386

Preview optimized images in a web browser

You can preview an optimized image in any web browser installed on your system from the Save For Web & Devices

dialog box (File

> Save For Web & Devices). The browser preview displays the image with a caption listing the image’s

file type, pixel dimensions, file size, compression specifications, and other HTML information.

• To preview an image in your default web browser, click the browser icon at the bottom of the Save For Web &

Devices dialog box.

• To select a different browser, select Other from the browser pop-up menu (next to the browser icon).

• To add, edit, or remove a browser in the browser pop-up menu, select Edit List from the browser pop-up menu.

In the Browsers dialog box, you can find all browsers on your computer and set the default browser to preview

your image.

Web graphics optimization options

Web graphic formats

Web graphics formats can be either bitmap (raster) or vector. The bitmap formats—GIF, JPEG, PNG, and WBMP—

are resolution-dependent, meaning that a bitmap image’s dimensions, and possibly image quality, will change at

different monitor resolutions. The vector formats—SVG and SWF—are resolution-independent and can be scaled up

or down without losing any image quality. The vector formats can also include raster data. You can export from Save

For Web & Devices to SVG and SWF in Adobe Illustrator only.

JPEG optimization options

JPEG is the standard format for compressing continuous-tone images such as photographs. Optimizing an image as

a JPEG format relies on lossy compression, which selectively discards data.

Note: Since image data is lost when saving a file in JPEG format, it’s a good idea to save the source file in its original

format (for example, Photoshop .PSD) if you plan to edit the file further or create additional JPEG versions.

Optimization settings for JPEG

A. File Format menu B. Compression Quality menu C. Optimize menu

Quality Determines the level of compression. The higher the Quality setting, the more detail the compression

algorithm preserves. 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.

Optimized Creates an enhanced JPEG with a slightly smaller file size. The Optimized JPEG format is recommended

for maximum file compression; however, some older browsers do not support this feature.

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Adobe Illustrator CS3 User Manual Page 392