Canon PIXMA MG2440 - Manual (Page 186)

The (Center) mark for setting the center position appears in the Preview area.
Note
If the (Center) mark does not appear, move the cursor over the Preview area.
The effect level can be changed by moving the slider displayed below Fish-eye
Effect.
5. Drag the (Center) mark to set the center position, then click OK.
The edges of the image are distorted, focusing on the specified area, and the
(Enhancement) mark appears on the upper left of the image.
Note
Click (Display Comparison Screen) to display the images before and after the
enhancement side by side in a separate window so that you can compare and
check the result.
Click Cancel to undo the enhancement. Enhancements made with other
functions are retained.
6. Click Save Selected Image or Save All Filtered Images.
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