Resolution doesn't affect the quality of images viewed on a monitor, television, or other screen device as it does printed photos. What resolution does do is determine the size at which the image appears.
This issue is one of the most misunderstood aspects of digital photography, so I explain it thoroughly in Chapter 9. For now, just know that you need way fewer pixels for onscreen photos than you do for printed photos. For example, Figure 3-5 shows a 450-x-300-pixel image that I attached to an e-mail message.
For e-mail images, I usually stick with a maximum horizontal pixel count of 450 and a maximum vertical size of 400 pixels, depending on whether the picture is oriented horizontally, as in the figure, or vertically. If your image is much larger, the recipient can't view the entire picture without scrolling the display.
In short, even if you use one of the Small Quality settings on your Canon, which produce images that contain 1936 x 1288 pixels, you'll have more than enough pixels for most onscreen uses. The only exception might be an image that you want to display via a digital projector that has a very large screen resolution. Again, Chapter 9 details this issue and also shows you how to prepare your pictures for online sharing.
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To begin with your career in photography at the right path, you need to gather more information about it first. Gathering information would provide you guidance on the right steps that you need to take. Researching can be done through the internet, talking to professional photographers, as well as reading some books about the subject. Get all the tips from the pros within this photography ebook.