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Q&A

Q1:Which kinds of files compress better as GIF than JPEG or PNG?
A1: Since GIF uses a limited palette, any picture that has only a few colors will give you a smaller file as a GIF than in the other formats. Such graphic items as titles in flat colors, logos, posterized photos, or line art will make very small GIFs. Full-color photos will not.
Q2:When should I use Save a Copy instead of Save As?
A2: Use Save a Copy when you want to make a copy of the picture you are working on and then continue to work on the original instead of the copy. Suppose I have a picture called "Roses," which I have worked on and saved. If I save a copy as "Roses copy," and then keep working, I will still be working on the original "Roses" but will also have a copy of the picture in a closed file as it was before I did the additional work.
Q3:What file formats should I use for images I'll be putting in my Web page?
A3: You should try to stick with .psd files when creating your images. This allows you to use all the powerful Photoshop 5.5 editing features, such as layers. Once you've finished your image, save it as a .gif, .jpg, or .png for use on the Web.
Q4:How does color depth affect image file size?
A4: Simply put, the more colors that are in your image, the larger the file size, because it takes more bits to encode more colors.


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