Weird Image Color Differences.
I've notice this before in photos, and chalked it up changes I was making with revised upload files, but on this occasion I didn't change anything. In this case, for whatever reason the 900px preview is darker than both the image that appears on my images page, and images that show for all the different products. Is this something like SRGB vs CMYK thing going on, or something else.
Since this image isn't nearly as big as the one I uploaded, you can see the problem by going here: