Currently Being ModeratedJan 31, 2013 4:49 AM (in response to Taro-71)
The differences in the three dark images are more visibile on a calibrated screen or if printed, if you don't see any differences try to rise the brightness of the screen.
Currently Being ModeratedFeb 2, 2013 10:27 PM (in response to Taro-71)
I've done another test:
I've created a sample image with 4 colour faded bars with values from 0 to 128 for RGB and gray then I've putted on a page in Aperture book and iPhoto book then I've printed on PDF.
Below you can see the results: iPhoto is good whereas Aperture is ruined.
I've also noticed the Aperture results is influenced by the color profile chosed on the selector in the box, but no profile at all gives a good job , every profile returns a weird custom defect, also with "no profile" choice.