Gamma Differences
Windows has used a gamma of 2.2 since its introduction. Mac OS X has
used a gamma of 1.8 for all versions except Snow Leopard (the latest
release), which uses 2.2. What does this mean? Prior to Snow Leopard, Web
pages looked darker on Windows. Thankfully, both operating systems are
now in sync, so a Web page should look very similar on a Mac and PC that
use the same monitor.