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PhotogCda
Inspiring
July 13, 2018
Question

Noise in shadows - Not visible in Pr, but visible in rendered video

  • July 13, 2018
  • 2 replies
  • 2586 views

Have got a few clips that I had to shoot at higher ISO settings.  I'm assuming it's the higher ISO that's causing the problems.

In deep shadows, in the rendered clip, there's some blue/purple noise in some of the shadows.  I've tried crushing the shadows more and lifting the shadows with no effect on the end result.

It's not visible when I preview the footage in Pr.  It only shows up when the clip is rendered out.  I've tried both high and low bitrates, no difference.  Have tried both AVI and H.264, no difference.

Render at Maximum Depth/Use Maximum Render Quality on/off, no difference.

Useful thoughts appreciated.

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    2 replies

    Jeff Bugbee
    Community Expert
    Jeff BugbeeCommunity Expert
    Community Expert
    July 13, 2018

    Are you rendering out in Premiere or queueing in Media Encoder and rendering there?

    P
    PhotogCdaAuthor
    Inspiring
    July 13, 2018

    Rendering straight out of Pr.  Should that make a difference?

    Jeff Bugbee
    Community Expert
    Jeff BugbeeCommunity Expert
    Community Expert
    July 13, 2018

    It can, though I usually notice issues (especially when lumetri is involved) when files are exported out of AME instead of Premiere.

    A few more questions:

    • Are you rendering previews before you export?
    • Do the previews exhibit the issue?
    • Do you have "Use Previews" checked when you do your final export?
    M
    Meg The Dog
    Inspiring
    July 13, 2018

    As a test, if you go to File > Project Settings > General and set the Renderer to Software Only, does the problem persist?

    MtD

    P
    PhotogCdaAuthor
    Inspiring
    July 13, 2018

    Yes.  No difference.

    If I turn off the grading in the Effects Controls, the problem goes away.  The grading that is applied is, essentially, an overall darkening with the shadows pulled down quite a bit.  Typically, this would reduce the evidence of noise, but here it seems to be exacerbating it.

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