Canon 10D User Guide (en)

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Dynamic range (width of gradation expression) from dark points to bright 
points in an image can be adjusted.
O
The horizontal axis shows the input level and the vertical axis shows 
the output level.
Adjusting Dynamic Range
Move to the 
left
Input highlight 
points
Reverts the 
image to the 
original 
settings
Move to the 
right
Input shadow 
points
Output 
highlight point 
numerical 
value
Move downwards
Output highlight points
Output shadow 
point numerical 
value
Move upwards
Output shadow points
Input shadow 
point numerical 
value
Input highlight 
point numerical 
value
O
The setting range of shadow points is 0 to 247 (in 1-stop 
increments when entering a value).
O
The setting range of highlight points is 8 to 255 (in 1-stop 
increments when entering a value).
O
The histogram display changes according to adjustment. You can 
also fix the histogram display to the display before any 
adjustment