Adobe photoshop cs2 사용자 설명서

When preparing images for the web and other online media, you often need to compromise between image display 
quality and the file size of the image. Photoshop and ImageReady provide several controls for compressing the file 
size of an image while optimizing its online display quality. 

You can save images for the web in two ways: 

For basic optimization, the Photoshop Save As command lets you save an image as a GIF, JPEG, or PNG-24 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. See “To save a file in a different file format” on page 654. 

For precise optimization, you can use the optimization features in Photoshop Save For Web 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 combi­
nation 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 information to display 
your image in a web browser. 

In Photoshop, you use the Save For Web dialog box to select optimization options and preview optimized artwork. 
To open the Save For Web dialog box. choose, File > Save For Web.