Last week, we took a look at the compression being employed by Apple with its new 1080p content on the iTunes Store, a feature that has allowed Apple to increase file sizes by only 15-25% compared to 720p even as the number of pixels have more than doubled. A number of commenters were interested in seeing how 1080p iTunes content compares to Blu-ray, and Ars Technica has now returned with a new analysis looking at the relative quality of those two sources.
Comparison of color and detail in iTunes 1080p (left) and Blu-ray (right) formats
I was surprised to see how close the iTunes 1080p download comes to Blu-ray, considering that it's only a fraction of the file size. And let's be honest: there are lots of Blu-ray titles that look much worse than this iTunes download. But despite an impressive effort by Apple, Blu-ray still reigns king when it comes to image quality. And unlike iTunes titles, BRDs can have uncompressed multi-channel audio, multiple audio language options, and special features.
Comparison of dark gradient handling in iTunes 1080p (top) and Blu-ray (bottom)
(Brightness enhanced for clearer demonstration)
Article Link: iTunes 1080p Content Comes Close to Blu-ray Quality, But Can't Quite Match