Canon EOS-1D X Manual (en)

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Adjusting by Comparing Multiple Images
You can synchronize the areas in different images to be displayed 
among multiple preview windows, and adjust images while comparing 
them.
1
In the preview window, display the multiple images 
to be compared.
2
Align the images.
Select the [Window] menu  [Arrange horizontally] or [Arrange 
vertically].
The preview windows are aligned.
3
Select the [Preview] menu  [Sync preview position] 
and [Sync preview display size].
4
Enlarge the image.
Enlarge and display any of the preview windows.
Other preview windows will also be displayed in the same 
position/enlargement ratio.
5
Move the area to be displayed.
If you move the enlargement display area in one of the preview 
windows, the enlargement display area will also change in all 
other preview windows.
To cancel synchronization, select the [Preview] menu  [Sync 
preview position] and [Sync preview display size] again.
Synchronization only applies to the enlargement display position 
and the enlargement ratio. Adjustments to the images are not 
synchronized.
JPEG/TIFF