Uneven Blacks

Discussion in 'MacBook Pro' started by Helfeather, Aug 28, 2007.

  1. Helfeather macrumors member

    Joined:
    Aug 20, 2007
    #1
    Er, does anyone know why my 2.4 Ghz Macbook Pro displays uneven black when watching video clips? Like, the black isn't uniformed, I see patches/squares/blocks of lighter black all over the place. But when I watched the video clip on my home PC or work PC, the black is completely uniformed and I see no lighter black patches/squares/blocks.

    For example, here's a print screen I took of my laptop display playing a video clip:

    [​IMG]

    However, when I play the EXACT same clip on my home PC (LCD) or my work PC (crappy display, like not even LCD), I don't see ANY patches/squares/block of lighter black that stand out.

    Could anyone please help me w/ a solution? T_T
     
  2. dpaanlka macrumors 601

    dpaanlka

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    Nov 16, 2004
    Location:
    Illinois
    #2
    Umm... what about if you play a movie in Mac OS X?
     
  3. 1319987654321 macrumors newbie

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    Aug 28, 2007
    #3
    I think thats normal , how about a black pic?
     
  4. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #4
    Oh, for a black pic, it looks uniformly black, it's fine.

    The problem is when watching video clips.

    I'm at work right now, and that screenshot up there looks perfectly uniformed black to me, no blocks/patches/squares.
     
  5. Knolly macrumors 6502a

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    Jul 22, 2007
    #5
    It probably is just the video and your work computer has different screen settings, or it's the windows media player renderer that's doing it...
     
  6. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #6
    But that doesn't explain why the screenshot up their looks patchy/blocky/squarish on my Macbook Pro display and not on my work's display or home's display -_-;;

    Er, is anyone on their Macbook Pro right now?

    Does anyone seen uneven black on that screenshot up there? ex: blocks of lighter black
     
  7. LinuXtreme macrumors regular

    LinuXtreme

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    Jul 15, 2007
    Location:
    Near Aspen
    #7
    It has to do with the way that LCD screens display black. IIRC, in order to display back, those pixels in the display turn off. I think that its light leaking in from the other pixels around the lightless (black) area that causes black colors to be off-black and blotchy.

    A new type of LCD is in the works that will solve the problem. I read it in Popular Science, but can't remember the details of how.

    Edit: I just read the second part of OP's post and saw that one of their other monitors (LCD) didn't have the problem so I might be wrong about their specific problem.
     
  8. 1319987654321 macrumors newbie

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    Aug 28, 2007
  9. dpaanlka macrumors 601

    dpaanlka

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    Nov 16, 2004
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    Illinois
    #9
    What about when you play videos in Mac OS X... ;)
     
  10. rychencop macrumors 65816

    rychencop

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    http://www.northaugusta.net/
    #10
    I would not worry about it. I doubt it has anything to do with the screen.
     
  11. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #11
    Hm, let's hope so.

    Anyone on their Macbook Pro right now?

    Is the black uniformed or are there blocks of lighter black?
     
  12. suneohair macrumors 68020

    suneohair

    Joined:
    Aug 27, 2006
    #12
    Your problem is a likely a calibration problem. Compressed video cuts out color and detail where it can. Your MBP screen is calibrated in a way that shows the non-uniformity of compressed video.

    The rest of the black in that windows is uniform. Suggesting the problem is inherent in the video itself, as it is in most compressed video. The fact that the screenshot includes the patches you see further suggests that the problem is inherent in the video and not the panel. It is most likely not a screen problem.

    Hope that helps.

    Experiment: Up the brightness on the other displays you have and see if you can see the squares.
     
  13. GimmeSlack12 macrumors 603

    GimmeSlack12

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    Apr 29, 2005
    Location:
    San Francisco
    #13
    What about when you play videos in Mac OS X???
    This looks like a decoding issue, and you are seeing a bit of artifacts like in a highly compressed JPEG picture. Absolutely nothing to worry about. I promise.
     
  14. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #14
    That can actually be true.

    When I play MKV files, the black is uniformed and transition between frames is smooth.

    I think the file I am watching was originally saved as MKV (50% larger file size) and coverted to AVI.

    However, is there an option to calibrate the display in a way so that it doesn't show the non-uniformity of compressed video?
     
  15. elcid macrumors 6502

    Joined:
    May 5, 2007
    #15
    I get that all the time on video that is any part of compressed. If it only happens in WMP then I would say its a rendering or video problem.
     
  16. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #16
    I tried the same clip on Media Player Classic as well.

    Same result, the same frame had blocks of lighter black/blotches as well.
     
  17. Helfeather thread starter macrumors member

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    Aug 20, 2007
    #17
    Hm, interesting.

    I am on my PC right now and when I upped the brightness of my display (LCD) from 50 to 60-65 (the range being 1-100), and the contrast from 70 to 100, I can definitely see blotches of lighter black up in that screenshot I posted.

    What does this mean?
     
  18. Blacky macrumors member

    Joined:
    Jun 27, 2007
    #18
    This means:
    1) your screens outside of your mbp were not correctly calibrated
    2) older TN displays that suck
    3) just very cheap

    But trust me, this is normal for most xvid/divx/mpeg4 video, almost always visible in darker parts, now that you have a mbp with a decent screen you just notice those things harder, I can also see them perfectly on my dell 2407 wich is connected to my mbp, nothing to worry about.
     
  19. GimmeSlack12 macrumors 603

    GimmeSlack12

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    Apr 29, 2005
    Location:
    San Francisco
    #19
    I am a bit dumbfounded by posts on here sometimes.

    Quick, look at the black border around the WMV player window. No black splotches there. Thats because that is part of the program and not some compressed video. Does that make sense?
     
  20. klymr macrumors 65816

    Joined:
    May 16, 2007
    Location:
    Utah
    #20
    I agree!!! No worries. Don't you also notice those bog blotches when watching videos on youtube? I'm not talking just black. It's a compressed video. It's going to happen! Nothing wrong with your display.
     
  21. Helfeather thread starter macrumors member

    Joined:
    Aug 20, 2007
    #21
    Ah, I understand now.

    I want to thank everyone for their great help and input on this issue.

    Thanks!!! ^_^
     

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