Why do I have heavy noise from underexposure?

Discussion in 'Photographic Discussions' started by eravedesigns, Jun 30, 2008.

  1. eravedesigns

    eravedesigns TPF Noob!

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    I have noticed recently that when I was shooting some city shots at dusk that the blacks and dark sky would get some heavy noise. I was exposing for the street lights and buildings but all my shots in the dark areas started to look weird. I also just tried shooting a black board with a glass and the black starts to get the same look. How do I stop this or is this just what a digital sensor does. I was shooting at iso 100 for the photos. In other words how do I expose so that by black stays completely black without noise going nuts.

    You can kind of see it in this example but its weird in lightroom its very obvious but when i export into jpg it looks much better.

    [​IMG]
     
  2. It's what happens in digital photography. The sensors will create noise when you underexpose, even at lowest ISO. If you need a darker image, nail the exposure and then darken when you process.
     
  3. nynfortoo

    nynfortoo TPF Noob!

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    Push your exposure as far to the right of the histogram as you can without blowing the highlights, then darken in post if need be. I'm not sure there's really anything else you can do.
     
  4. eravedesigns

    eravedesigns TPF Noob!

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    Thanks for the response you confirmed what I was half thinking hah.
     
  5. Rhys

    Rhys TPF Noob!

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    Don't forget also that over-sharpening adds noise too.

    This is why you can't just get a crap lens and sharpen the hell out of your images.
     
  6. Battou

    Battou No longer a newbie, moving up!

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    :lmao: that and the halos
     
  7. amarques

    amarques TPF Noob!

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    If you still have some problems with noise, I've found that Noise Ninja does a nice job, but has nynfortoo mentioned, try to minimize on capture and darken on post.
     

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