The histogram of the preview image is updated as the settings on the image are changed. You can right-click on the live histogram to set the curve's size and representation.
There are two modes in which you can control the exposure. Clicking the controls or buttons underneath the live histogram will show you the overexposed and underexposed pixels in the image.
Activate the check boxes by clicking them. The corresponding pixels will light up in the preview. Click each Indicate tab to view the over- or underexposed pixels, respectively. The numerical values next to the controls indicate the amount of overexposure or underexposure per channel in percentages. These options provide you with objective guidelines to correct the exposure, always keeping an eye on the color combination and mood in the picture.
USING GIMP: CORRECTING AND TOUCHING UP YOUR IMAGES
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.