Let’s keep it simple. 1.8 is the standard display set with all Macs using Leopard, 10.5. 2.2 Television Gamma is considered to be a better choice if you are particular about images and color if you are going to display it on TV, or PC-compatible computers, or if you want to mimic the gamma used by new Macs that ship with Snow Leopard.
Snow Leopard is set, by default to the 2.2 gamma.
But if you’re not on Snow Leopard yet, you can calibrate you display to be in 2.2 and see for yourself how images on your screen is deeply enhanced.
Some might ask why there is a need to do this. If you are particular with how the display renders images and color, or simply want a visually deeper and richer screen to look at, you may want to try out 2.2 and experience the vast difference between the two.
The image above shows you how the desktop appears at 1.8. This is not bad. But when you switch on 2.2, you’ll see that your display will show deeper blacks and richer colors - which is important when you are editing photos in iPhoto, or creating your movies with iMovie.
The 2.2 Television gamma allows you to experience a more sophisticated viewing and output from Mac OS X displays, giving you a deeper color range as opposed to the standard 1.8.
