The Gamma Correction command is used to adjust the intensity of colors in a picture to compensate for any differences between your computer's monitor and the original equipment used to create the image. Gamma is the value that is used to calculate this adjustment.


Use the slider control to select the desired Gamma value. A value of 1.00 represents no change, while lower values will darken the picture and higher values will lighten the picture.


Select the color channel you wish to adjust. For the majority of images, the RGB channel (a composite of all three RGB channels) will produce the best results. However, it can sometimes be helpful to make adjustments to an individual color channel.


The Reset button can be used to quickly restore the gamma slider to the default 1.00 value.


The original picture and the effects of your changes are shown in the Before and After preview windows. Drag the vertical slider to adjust the magnification level of the preview images. Click the button to shrink the preview images so that they fit completely within the preview window, or click the button to display the preview image actual size (1:1). If needed, you may move the preview to display a different portion of the picture using the scroll bars or by dragging its center with the mouse. The button can be used to quickly zero in on a specific area of the picture.


When you are satisfied with your settings, click the Apply button to modify your picture.