Canon 550D Software Guide (en)

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Dynamic range (width of gradation expression) from dark points to bright 
points in an image can be adjusted.
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The horizontal axis shows the input level and the vertical axis 
shows the output level.
Adjusting Dynamic Range
Move to the left or rignt
Input highlight points
Move to the left or right
Input shadow points
Move downwards
Output highlight points
Move upwards
Output shadow points
You can adjust the brightness of shadows and highlights in an image. 
By adjusting shadows and highlights in an image with a restricted 
brightness, you can reduce the effects of clipping in shadows and 
highlights. 
Adjusting Brightness of Shadows/Highlights
Drag the sliders left or 
right
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