Canon EOS-1D X Manual (en)

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Dynamic range (width of gradation expression) from dark points to bright 
points in an image can be adjusted.
The horizontal axis shows the input level and the vertical axis shows 
the output level.
Adjusting Dynamic Range
Advanced
Move to the 
left
Input white 
points
Reverts the 
image to the 
original 
settings
Move to the 
right
Input black 
points
Output 
white point 
numerical 
value
Move downwards
Output white points
Output black 
point numerical 
value
Move upwards 
Output black points
Input black 
point numerical 
value
Input white 
point numerical 
value
For information on using the Auto Lighting Optimizer, see “Using the 
Auto Lighting Optimizer” 
 in “Editing with the Basic Adjustment 
Tool Palette”.
The setting range of black points is 0 to 247 (in 1-stop increments 
when entering a value).
The setting range of white points is 8 to 255 (in 1-stop increments 
when entering a value).
You can display pre- and post-editing histograms 
.
Using the Auto Lighting Optimizer
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