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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Fixing Exposures with Histograms

While you can often recover poorly exposed photos in your image editor, your best bet is to arrive at the correct exposure in the camera, minimizing the tweaks that you have to make in post-processing. However, you can’t always judge exposure just by viewing the image on your XSi’s LCD after the shot is made. Nor can you get a 100 percent accurately exposed picture by using the XSi’s Live View feature. Ambient light may make the LCD difficult to see, and the brightness level you’ve set can affect the appearance of the playback image.

Instead, you can use a histogram, which is a chart displayed on the Rebel XSi’s LCD that shows the number of tones being captured at each brightness level. You can use the information ...

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