Taking pictures with inaccurate exposure can result in pictures that are too bright or too dark. Often, you can dramatically improve a digital picture by correcting the brightness and contrast. You can use the automatic correction tool in Photo Gallery or adjust the exposure yourself.
Open Windows Photo Gallery by clicking the Start button , clicking All Programs, and then clicking Windows Photo Gallery.
Click the picture you want to correct, and then click Fix.
Click Auto Adjust.
Wait a few moments while Windows automatically corrects your picture's brightness, contrast, and colors.
Click Back to Gallery to automatically save the changes to your picture.
If you don't like the Auto Adjust results, click Adjust Exposure, and then use the Brightness and Contrast sliders to make the changes yourself. You can also click Undo to remove changes made by Auto Adjust.
If you increase or decrease the brightness, you will also usually need to increase or decrease the contrast by a smaller amount to make the picture look properly exposed.