Movies look bad

Discussion in 'iMac' started by TyWahn, Apr 18, 2018.

  1. TyWahn macrumors 6502

    TyWahn

    Joined:
    Oct 25, 2003
    #1
    Why do my purchased iTunes "HD" movies look so terrible on my 2017 4K iMac? They are streaming, but I have plenty of bandwidth. They are "noisy" with movement and look SD at best.
    Does anybody have any ideas? I'm definitely not expecting 4K but I am expecting HD at least.
    Thanks
    Ty
     
  2. Lunder89 macrumors 6502

    Lunder89

    Joined:
    Oct 16, 2014
    Location:
    Denmark
    #2
    I just fired up a movie from 2011, one of the few I have in my movie library. I am using a 5K iMac. There is a little noise in some places and the edges are a little undefined on close-ups. But I wouldn't say SD quality.

    But if the movie is on full HD (1920 x 1080) which is what I was playing, it still has a way to scale. The 4K resolution is 3840 x 2160. Everything needs to be scaled up 2x, that can easily compromise quality. If you are watching 720p content (1280 x 720) the scale is 3x, and I can see if things start to look grim. But I don't have any 720p stuff.
     
  3. Michael Scrip macrumors 603

    Joined:
    Mar 4, 2011
    Location:
    NC
    #3
    iTunes offers "HD" and "Full HD" resolutions.

    I wonder if you're seeing the 720p version instead of the 1080p version?
     
  4. fathergll macrumors 65816

    Joined:
    Sep 3, 2014
    #4
    Can you give some specific examples of movies?
     
  5. Moonjumper macrumors 68000

    Moonjumper

    Joined:
    Jun 20, 2009
    Location:
    Lincoln, UK
    #5
    In iTunes, go to the preferences and check the following: Under Playback, make sure the Video Playback Quality is set to Best Available. Under Downloads, make sure Download full-size HD videos is checked. It shouldn't make a difference for streaming, but worth checking. On a related point, do you have the same image problems if you download a movie?

    Something to bear in mind, the iMac 4K is a true 4K screen at 4096 pixels (cinematic 4K), but UHD is 3840 (consumer 4K), a pixel doubled Full HD. As the scaling is not doing a perfect pixel doubling, extra work is needed to upscale, potentially creating issues.
     
  6. TyWahn thread starter macrumors 6502

    TyWahn

    Joined:
    Oct 25, 2003
    #6
    Force Awakens, Finding Dory, Hugo
    Those are just a few.
    --- Post Merged, Apr 19, 2018 ---
    I will check that. Thanks for your reply. And I haven’t tried downloading but I’ll try.
    --- Post Merged, Apr 19, 2018 ---
    How do I tell?
    Funny thing is, if I stream to my Apple TV from my iPhone they look great.
     
  7. Lunder89 macrumors 6502

    Lunder89

    Joined:
    Oct 16, 2014
    Location:
    Denmark
    #7
    Unless you have the 4K Apple TV, the explanation is that the Apple TV doesn't have to do any upscaling of the content.
    Also, I am betting you are sitting further from your TV, than your iMac. (I know I do )
     

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