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Q1:How do I save a graphic for the Web?

A1: Your best bet is to use File>Save for Web. This command opens an incredibly powerful dialog with options for tweaking the image's size and quality. In particular, you have the option of viewing the original graphic and several optimized versions (by clicking on the appropriate tab), allowing you to compare GIF versus JPEG for quality, file size, and approx-imate download times. From this dialog you can also change the dimensions of the image by going under the Image Size tab and choosing your settings. Preview the image in a Web browser by clicking on the Preview in Default Browser icon at the bottom of the dialog (it looks like a small globe). Note: You can also save the settings as a preset by clicking on the Preset flyout menu and choosing Save Settings.
Q2:Why is one GIF file bigger than another? I made two buttons that are basically the same (size, shape, color) except for the shading on the buttons. When I check the final size, one is bigger than the other. Why would that happen?
A2: That happens when you use a gradient fill that is horizontal or diagonal. When GIF files are saved, they are compressed by reading across the document one “row” at a time. A horizontal or diagonal gradient would contain lots of different colors in the same row, and that cannot be compressed as much. A vertical gradient changes color one row at a time, making for a more efficient compression. Bottom line: For smaller GIF files, use only vertical (top-to-bottom or bottom-to-top) gradients.
Q3:I am trying to save in JPEG format, but I can't. Why?
A3: The most common cause is that you have layers in your document and JPEG format does not allow layers. Use File>Save As and Photoshop will automatically uncheck the Layers option and save the file as a copy. Or simply flatten (Layer>Flatten Image) the layers (if you're sure you won't be editing them later) before you save.
Q4:When should I use JPEG versus GIF?


A4: In general JPEG is used for photographic images, whereas GIF is used for “flat” graphics with fewer colors. However, depending on the size of the image, you may make the opposite choice. Remember, the most important goal of a Web graphic is to look good at as small a size as possible. Use File>Save for Web, click on the 2-Up tab, and select JPEG for one preview and GIF for the other. This way, you'll be able to compare the two formats side-by-side. Note: JPEG does not allow transparency.



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