When I try to set the white point for an image in Aperture 3 (using the curves tool), the image turns entirely white. When I try to set the white point on the same image in Photoshop CS6 using the same spot, the white point is set and the image looks as it should.
What gives?
Update: Here is a before and after sample of screenshots.
I know the original levels look ridiculously skewed—but they do turn out fine if I edit them in Photoshop, and that's still strange.