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Image representation

I have an NSImageView displaying an image and I want to check the pixel color at specified point with [representation colorAtX:pt.x y:pt.y].
For special purposes I get the representation with initWithFocusedViewRect:;
now: the resulted representation seems to have the image upside down, I mean the top of the image seems to be at the bottom in the representation and so to get the color for point (0, 0) I must check point (0, height). Is this normal? How can I rotate the representation?

Thanks in advance.
livio
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