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Support Horrible blue aliasing/artifacts in black areas during video playback

Discussion in 'Android Devices' started by jkc120, Dec 17, 2011.

  1. EarlZ

    EarlZ Android Enthusiast
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    @All who think this is a file quality issue
    Answer me this, when viewing this said video on another display medium like the following

    Galaxy S
    Galaxy S2
    Galaxy Tab 7.7
    Samsung Wave 1
    Samsung Wave 3
    Samsung 32" LED-TV
    Samsung T220
    Dell U2410
    Apple 30" Monitor

    Does not show any of the horrible quality that is on the screen shot, there are no hints of black clipping on the SuperAMOLED devices even on the list.

    Playing around with VLC and adjusting the gamma/contrast/brightness to show the flaws only shows how ignorant one can really be!

    @Those thinking this is purely a software issue
    You might be right on those since the gamma curve on the Galaxy Note/Nexus is very incorrect as reported by Supercurio

    @Those thinking this is not a hardware issue
    So why did others had this resolved, especially on the Galaxy Note after a few screen replacements?

    Altho this is already a non issue for me since samsung has returned my money and confirmed to me that this is an issue but everyone else is open to speculate on what they think about this issue.
     

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  2. jkc120

    jkc120 Android Expert
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  3. jbdan

    jbdan Extreme Android User
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  4. jkc120

    jkc120 Android Expert
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    Unfortunately my wife has my nice point and shoot camera and is out of town, but I'll see if my good ole trusty dinc can take some close ups and I'll post 'em here :)
     
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  5. jkc120

    jkc120 Android Expert
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    Well, my old point and shoot doesn't have shutter speed control :( So the best I could do was trick it by using the "sunset" scene mode. I have to fiddle with color control now, as the gamma=7 made things a bit purplish. :)

    I zoomed in and cropped the pics so you could see it more clearly what's going on. :)

    Here's how it looks with the default gamma:

    [​IMG]



    And now (notice the black is ALL black as it should be):

    [​IMG]
     
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  6. jkc120

    jkc120 Android Expert
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    Actually, I take it back. It DOES help with black areas of the video, but it's a trade off. In other places where there was no issue before, now there are some color banding effects. With gamma set to 5, the blacks have the issue. But if I go to 10 the lighter colors have issues. 7 seems to be an ok middle ground for video viewing, but it still has its own issues. So this helps quite a bit, but does not remove the video problems entirely I'm afraid. :(
     
  7. Demache

    Demache Android Expert
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    I just want to get this straight, if the artifacts are like the ones in the screenshot I took.

    [​IMG]

    I guess drop box doesn't want to cooperate so here's a URL instead. http://db.tt/5cz1Zdmx

    Then they don't seem to be much different than regular compression artifacts. They are just becoming more pronounced. You can see it pretty easily along the dark side of Neo's face and neck.
     
  8. jbdan

    jbdan Extreme Android User
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    An excellent comparison wow it is clearly different and better from those 2 pics. Thanks!
     
  9. TH3ORY

    TH3ORY Newbie
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    Hi it worked flawlessly on Galaxy Note i had no back blocky clipping issues ??
     
  10. jkc120

    jkc120 Android Expert
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    Posted this in a thread on XDA as well, but figured I'd share here.

    My friend got an AT&T SGS3 and we were comparing the screens to see if any of the issues with the Nexus screen were still present. All I have to say is the SGS3 screen is night and day better than the Nexus:

    - practically ZERO banding, even at lowest possible brightness
    - color remains much more true even at lowest brightness
    - no tinting I could detect at all, even at lowest brightness
    - played back some videos and it's flawless. No artifacts, no color banding/gradients, no splotches.

    The screen is practically indistinguishable from an LCD, except it maintains the deeper blacks.

    Looks like Samsung really did tweak the hd samoled process technology for the SGS3 screen. I think I'm going to pick one up, once the dev community situation shakes down and I know if I'll have good dev/ROM support.

    Kind of sad looking at the Nexus display now. :(
     
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  11. dhworph

    dhworph Android Enthusiast
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    very cool find jkc! thanks for the note on leankernel..

    This makes sense though... the OEM peeps have it set so that the colors dont get the issue, but blacks do... they probably picked what they thought was the less noticable setting, which was to make the colors better and the arifacts visible in blacks.

    I think they made the best decision, as most people are used to crappy video, and the artifacts are much less noticable on high quality video... but I would love to be able to have freedom to set it (gamma, color balance, etc).

    I wonder cranking the gamma in the opposite direction would help some of those people with color banding issues ???
     
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