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415
Adobe Photoshop Help
Preparing Graphics for the Web
Using Help
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Contents
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Index
Back
415
Preparing Graphics for the Web
About optimization
Optimization is the process of fine-tuning the display quality and file size of an image for
use on the Web or other online media. Adobe Photoshop and Adobe ImageReady give
you an effective range of controls for compressing the file size of an image while
optimizing its online display quality.
There are two methods of optimizing images:
•
For basic optimization, the Photoshop Save As command lets you save an image as a
GIF, JPEG, PNG, or WBMP file. Depending on the file format, you can specify image
quality, background transparency or matting, color display, and downloading method.
However, any Web features—such as slices, links, animations, and rollovers—that
you’ve added to a file are not preserved.
For complete information on using the Save As command to save an image as a GIF, JPEG,
or PNG file, see
“Saving images” on page 446
.
•
For precise optimization, you can use the optimization features in Photoshop or
ImageReady to preview optimized images in different file formats and with different file
attributes. You can view multiple versions of an image simultaneously and modify
optimization settings as you preview the image to select the best combination of
settings for your needs. You can also specify transparency and matting, select options
to control dithering, and resize the image to specified pixel dimensions or a specified
percentage of the original size.
When you save an optimized file using the Save for Web (Photoshop) or Save Optimized
(ImageReady) command, you can choose to generate an HTML file for the image. This file
contains all the necessary code to display your image in a Web browser.
Optimizing images
In Photoshop, you use the Save for Web dialog box to select optimization options and
preview optimized artwork. In ImageReady, you can view and work with optimized
images at any time in the document window.