I'm implementing the affine2d class, and I can't understand what the outputLimits function does

[motherboard]

Can anyone have a look  here
<http://nl.mathworks.com/help/images/ref/affine2d.outputlimits.html>   and
see if they can understand it?
My initial impression was that it is equivalent to 

          [transformedXMinMax transformedYMinMax] =
transformPointsForward(tform,[xMin xMax], [yMin yMax]);

But this does not result in the correct values as per the example on the
page...



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