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cvFlip function

I found this in some code that I am adjusting for my needs:

 cvFlip ( img, NULL, 1 );

I don't see any logic behind it. Am I missing something?

cvFlip function

I found this in some code that I am adjusting for my needs:

 cvFlip ( img, NULL, 1 );

I don't see any logic behind it. Am I missing something?

EDIT: NULL confused me.