When you properly expose an image, everything is balanced. Shadows are dark but still retain detail. Highlights are bright but not blown out. Skin looks normal, colors are saturated and contrast isn't too strong.
When you over or underexpose an image and try to fix it after the fact, shadows can start to show noise and run to deep black with no detail. Highlights can be completely blown out with no recoverable detail. Contrast gets much stronger than normal.
Of course, there's always a little wiggle room. You can be off by 1/2-stop without any real issues. In a scene without a huge dynamic range you can probably even be off by around 1-stop and get a great looking image. Any more than 1-stop and your results may or may not be acceptable.
There are always going to be photos that are under or overexposed. Maybe a moment caught you off guard and your settings weren't perfect. Maybe you just metered incorrectly and didn't nail the exposure. It happens. The less often it happens, though, the better your overall images will be.
Here are a few quick examples from a recent wedding that illustrate the importance of getting the exposure correct in-camera.
Here's a photo that was incorrectly exposed. |
While it's possible to recover lots of the information, the highlights are blown out beyond recovery and the image doesn't look very good. |
Here's an image captured under the same conditions that was properly exposed in-camera. Much better... |
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