Brightness  
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Raising the brightness increases the amount of white in an image, making it appear more washed out. Lowering the brightness may help you read light or faint text.  
 
You may adjust the brightness either way:  
·Slide the thumb of the scroll bar to the right or left, which adds lightness or darkness to all colors in your image.  
·Click the arrow signs on the right and left ends.  
The current value is shown to right of each scroll bar.