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Whether you're designing an image destined for life on the Web or creating an email-friendly version of a digital photo, you need to follow three very specific steps to create a high-quality image that people can download quickly:
Adjust the image's dimensions.
First, you need to decide how big your image should be. In some cases, someone else may give you the size (like when you're hired to make a web banner or ad). Other times, you choose the size (like when you email a digital photo, send a sample design to a client, or post an image in an online discussion forum). And if you're designing graphics for smart phones and other mobile devices, you have some very specific sizes (and even file formats) to consider. All of these situations are discussed in this section.