A user on an Italian photo forum was wondering why he was getting significantly different clipping point and histogram between Aperture and Lightroom. He posted screen shots where one can see the difference as well as the camera histogram and color space. No need to translate as the screenshots says it all:
http://www.juzaphoto.com/topic2.php?l=it&f=23&t=309613&titolo=Grossi_problemi_di_istogramma_H_E_L_P_I don't know much about Aperture, but I was surprised by how much the highlights were clipped in Aperture. I am curious to understand what is the cause of the difference. It almost looks like Aperture is building the histogram from an sRGB
Or could it be different default settings and no highlight recovery?