Why your Web content will look darker on Snow Leopard

If you’re a Web designer, expect your CSS colors & your untagged/unmanaged images to look darker on Snow Leopard than on previous versions of the Mac OS. You’ll also see less of a visible color shift when going from Photoshop to Flash or other unmanaged environments (e.g. Internet Explorer).

Why is that? Apple has switched to a default gamma of 2.2, which is what Windows has used for years. Colors that aren’t color-managed are going to look darker on the whole. Your whole display will now be closer to what Windows users see*.

Apple’s marketing materials (and reviews of Snow Leopard) say only that the change is “to better serve the needs of consumers and digital content producers.” Not really knowing what that means, and wondering why Apple would change the Mac to match Windows after 25 years of using gamma 1.8, I sought out more info.

Adobe Principal Scientist Lars Borg provided some perspective. Lars has spent the past 20 years at Adobe defining & driving color management solutions, and lately he’s been focused on digital cinema standards. Here’s what he said: