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Activity Forums Adobe Premiere Pro Contrast Problem

  • Contrast Problem

    Posted by Guy Kingston on February 12, 2008 at 9:28 pm

    Recently we shot a load of interior footage that looked perfectly lit through the camera’s inbuilt monitor (we’re using a Sony V1). Having captured the footage though it appears far too dark.

    When we apply an auto-contrast filter it does make it all much brighter and much closer to what we saw through the viewfinder when we filmed and what we were expecting to see in the edit suite.

    However, this makes the image look grainy and when viewed at 100% there is a loss of resolution when compared with the original. I know auto-contrast is not the answer (not least because the contrast varies during the shot), but before I spend the next few weeks or months of my life fiddling with different settings (I can be obsessive about these things 🙂 ) I thought I would first ask you experts for any tips or suggestions.

    Does anyone know why the viewfinder would have lied to us like this? The exposure was set manually and the gain was set to zero on the camera.

    Are there any brainy ideas for making the image brighter without losing much, if any, of the picture quality? We get the best result when the whites are clipped at 0.10 in the auto-contrast filter but we can’t find a filter that will let us clip the whites at 0.10 but does nothing else. Is there one in Ppro, or is there a third party filter that might work?

    Should we reconsider recapturing using a different program and hence different codec? I have heard that different codecs interpret the footage in different ways. We captured originally in Sony Vegas, any suggestions for an alternative capture codec? (BTW, this is our least preferred option as it would mean replacing a lot of footage that is already part edited.)

    As ever, many thanks for your helpful suggestions,

    Guy

    Eran Hayden replied 18 years ago 5 Members · 7 Replies
  • 7 Replies
  • Jon Barrie

    February 13, 2008 at 12:02 am

    I would definately try to eliminate the possibility that its not the camera’s LCD that was set incorrectly and therefore ruined your perception of what was being recorded.
    Playback the camera through a TV monitor. I’m guessing this is going to show the problem is the camera monitoring is set higher than it actually is.
    Field monitors are a must for a paid job, unless you have a camera owner operator that knows their equipment inside and out and always checks the camera Monitor and Zebra Settings.
    I’d then try to recapture with PPro. The clips you’ve cut should simply be replaced if you offline them (project panel) and then batch capture them…provided they’ve been captured with proper TC and Tape names in Vegas. They’ll update, no replacing necessary!
    Another thing you could try is to use the compound arithmetic effect on the clips that are dark and get them to add or screen or even copy themselves. (like compositing a duplicated clip over itself – without having to make a duplicate). Then play with the amount of the desired ‘brightening’ effect.
    – Jon 😉

    How many editors does it take to change a light bulb?

  • Guy Kingston

    February 13, 2008 at 11:10 am

    Jon,

    You are a genius and surely sit at the right hand of God!

    The compound arithmetic filter has worked brilliantly (though I did have to lay a second copy of the clip on an additional video track and get the filter to add the original to that – it didn’t seem to want to work adding the clip to itself).

    As you suggested, I played back the tape from the camera in a TV monitor. The clip looked fine, just as it does on the camera monitor. So, I am assuming the camera settings were/are OK.

    I also captured a sample clip into PPro and this looked identical (far too dark) to the original captured in Vegas.

    I still don’t understand the cause and how to avoid this happening again, but at least I have a wonderful fix!

    Very many thanks indeed,

    Guy

  • Guy Kingston

    February 13, 2008 at 1:42 pm

    Looking at the shot close up (100% of original size) there is still a little grainy-ness with the compound arithmetic filter. Not really a problem but I wonder why – if I’ve understood properly it is just adding two shots together, not boosting the gain or anything.

  • Jeff Brown

    February 13, 2008 at 4:18 pm

    [Guy Kingston] “I also captured a sample clip into PPro and this looked identical (far too dark) to the original captured in Vegas.

    I still don’t understand the cause and how to avoid this happening again…”

    Guy, I implore you to FIND OUT IMMEDIATELY why this is happening. Something in your production chain is wrong! It might be your editing monitor. You did not mention what that was. It might be your viewfinder and playback monitors.

    Learn how to calibrate a monitor. Learn how to calibrate your viewfinder. Calibrate ALL your playback monitors; without also having ‘scopes, it is your only chance of producing video with correct levels.

    Here’s how to set upwith PAL bars.
    And, with NTSC bars.

    Apologies if you’re already aware of this, but it is essential.
    Hope it helps,
    Jeff

  • Zach Cobb

    February 13, 2008 at 6:25 pm

    It seems, from his description “when viewed at 100%…” and “As you suggested, I played back the tape from the camera in a TV monitor. The clip looked fine, just as it does on the camera monitor. So, I am assuming the camera settings were/are OK.” that he is using the in-program software overlay monitors in both Vegas and PPro.

    If you build it, then perhaps you will shut up!

  • Guy Kingston

    March 5, 2008 at 9:35 pm

    Thanks for the advice.

    My PC monitor is calibrated properly but I can’t tell how to check the camera’s viewfinder (I’m the producer not the camera operator – he’s away at the moment). We’ve got a V1 but a search of the manual for ‘calibrate’ and ‘calibration’ returns no matches.

    I get the same (good) quality picture on the V1 viewfinder as I do on a TV. I haven’t calibrated the TV but it strikes me as an odd co-incidence if they were both mis-calibrated equally.

    I use Spyder2express to calibrate the PC monitor and have always had great results with that in the past. It seems more foolproof than a manual calibration.

    And, other stuff looks fine on the PC monitor. The problem seems to be specific to this particular footage. Or, at least footage filmed in similar settings (indoor, looks well lit through viewfinder).

    Guy

  • Eran Hayden

    April 30, 2008 at 4:28 pm

    @Jon Barrie

    thanks for the tip on using the compound aritimetic filter. i had a similar
    problem and that filter works way better than everything else i tried. most
    other filters added an unacceptable amount of grain.

    i’m using final cut pro, by the way, so it’s not just premiere users who are
    finding your information helpful!

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