Agreed with gwpriester.

96dpi is standard size for all web pages.

Quote Originally Posted by gwpriester View Post
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96dpi is pretty standard for web images. If you increase the resolution it will not change the image on the web. It will just make the file size larger for the image and the image will take longer to load.

For flat graphics, or even photos, PNG 24-bit or 256 colors (8-bit) is good, though for photos the file size will be larger than JPEG. JPEG is better for photographs, but keep the compression to about 10-20 percent if you want to hold detail. JPEG is not good for flat graphics and areas of solid color as the colors tend to get soft and bleed.