The same goes for audio, with Blu-rays offering near-lossless audio quality and a far wider dynamic range than what you get with iTunes. This is most obvious in darker images and color gradients, where compression results in flat textures or banding. While Apple's compression is pretty good-you still get 4K definition and high-quality audio-you do lose some detail compared to a 4K Blu-ray. This is far too much data for most people to stream or download using iTunes, so Apple compresses movies to about a tenth of that size. Typically, a Blu-ray movie takes up about 25GB to 35GB of storage. Movies from iTunes, and other digital stores, still fail to match the quality you get with a 4K Blu-ray. But you'd be mistaken if you thought that meant the video and audio quality was exactly the same across both formats. Most movies are available in 4K video with some form of Dolby surround sound for both physical Blu-ray purchases and digital iTunes purchases.
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