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Rendering Problem: Chroma bleeds on shadows through solid matte

Feb 15, 2014 5:23 PM

Tags: #color #export #h.264 #render #chroma #bleeding #chromakey

Hello. I am having issue with a simple project. It's a simple green chroma keying project which looks ok inside Premiere, but once exported it turns into a nightmare. I will post screens instead of writing the details. I am not using any external plugins. The output is rendered with tweaked settings for H.264 Vimeo 720p 29.97 fps MP4 format. Sorry for blurring, but I'm working with an NDA, but the problem is only in the shadows as far as I can tell.


This is how it looks inside premiere (both reference and program look the same)

Screen Shot 2014-02-16 at 3.08.08 AM.JPG

This is how the matte looks:

Screen Shot 2014-02-16 at 3.08.35 AM.JPG

And this is the final render (checked in Quick Time and VLC):

Screen Shot 2014-02-16 at 3.10.20 AM.JPG

Never in my life of editing in Pr, FCPX or Smoke have I enountered this issue before. Any help/suggestions please?

  • Currently Being Moderated
    Feb 15, 2014 6:59 PM   in reply to Victor Stan

    That is certainly odd.


    And it looks OK in the Program Monitor?


    Your alpha channel looks great, although you didn't use the same exact frame, so the white showing through on his left side threw me for a moment until I looked at the position of his head and hands.


    Just out of curiosity, if you used the alpha channel matte as a track matte over a copy of unkeyed video, does it work properly?

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  • Currently Being Moderated
    Feb 16, 2014 4:37 AM   in reply to Victor Stan

    Certain effects take president over other effects.

    Sometimes you even need to nest before adding an effect.

    That is how it works.

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  • Currently Being Moderated
    Feb 16, 2014 6:00 AM   in reply to Victor Stan

    Maybe its wise to file a bugreport anyway.

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  • Currently Being Moderated
    Feb 16, 2014 6:27 AM   in reply to Victor Stan

    I think we all will agree, if it looks good in the Program Monitor and not in the export, then it is a bug. Regardless of the order of the effects. Obviously the order that the effects are processed should and does make a difference. But it should not show up only upon export. The preview files created by rendering should make it visible to you.

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    Feb 16, 2014 7:51 AM   in reply to Victor Stan
    I mean isn't that why the reference and program monitors are made for?

    You didn't show how it looks in Waveform Monitor. Any chance those areas have underdark values?

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  • Currently Being Moderated
    Feb 16, 2014 9:25 AM   in reply to Victor Stan

    Well, I can see some overbrights, but none underdarks.

    Another things to check are if media players' built-in colour management is disabled and whether your 'corrupted' exporting looks correct if you reimport it into PrPro.

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