Recently I noticed many of my images seem to have changed vs. my memory of them when viewing in Preview or other OS X applications (Aperture, etc). These images appear to have blacks that have been "crushed" and I am particularly sensitive to avoiding this when processing my photos.
I'm wondering if there isn't some change/defect in El Capitan responsible for this. I processed an old photo the other day and had to reduce black point to bring up the black levels...I've literally never had to do this before.
Maybe I'll recalibrate (nee, profile) my iMac with DisplayCal to see if there has been any change since the last time I profiled several months ago.
PP