Grain at low ISO on 20D

Discussion in 'Beyond the Basics' started by Azuth, Mar 10, 2007.

  1. Azuth

    Azuth TPF Noob!

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    I've noticed that even in low ISO (100) that the image quality seems a little off to me from my 20D. I'd like to hear from others whether I'm nuts, or they also think it seems off.

    I've attached a small part of an image to hopefully illustrate what I mean. This was shot RAW and opened with Adobe bridge at 300DPI. The exposure was pushed up by 0.30, but that's not a controlling factor. Particularly noticeable if you look at the material and the shadow, I don't think it's just the weave of the material I'm seeing.

    This image is just a crop, not enlarged.

    Shot at 1/60 f7.1 under strobes.

    [​IMG]

    Could I get the thoughts of some others, particularly Canon users.
     
  2. darich

    darich TPF Noob!

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    I had a 20D for around 18months and never noiticed it to be this bad.
    I'm surprised it's like this if the settings are as you say they are.
    Pushing the exposure will increase it a bit but i doubt to the level that's shown.

    What are other images like?
    What about natural light?
    You don't say what lens you used - this can sometimes have an adverse affect on quality.

    I've never used Adobe bridge before either - i opened my RAW images directly in photoshop and save them as TIFFs.
     
  3. Alex_B

    Alex_B No longer a newbie, moving up!

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    pushing exposure always has som effect like this. However it is quite pronounced in your example, I agree.

    Do you brighten up the shadows in your images in the raw conversion process? Then you locally can get a much stronger push in exposure. To me it looks a bit like this.
     
  4. Azuth

    Azuth TPF Noob!

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    The general consensus (I posted the same thing elsewhere) is that my image was under exposed, and that even the small bump in exposure had this effect on shadow detail.

    I did a quick comparison and this seems like a strong possibility. I intend to pay close attention to the histogram on my next shoot and see if I can do better.
     
  5. Garbz

    Garbz No longer a newbie, moving up!

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    You mentioned you shoot in RAW. Did you apply noise reduction as part of your post processing? RAW images are less sharp, and noisier than saving as JPEGs as noise reduction and sharpening form a big part of post processing of sensor data.
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I have found that with some RAW software, the default noise reduction is zero. Turn that up and it should help.
     
  7. Azuth

    Azuth TPF Noob!

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    Yeah. As I posted in another thread. I bought a book that was recommended to me called Real World Camera Raw with Photoshop CS by Bruce Fraser. It's already showing results.
     
  8. Mohain

    Mohain TPF Noob!

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    Expose right and you should get no noise. Allways keep an eye on your histogram and turn off any sharpening in your RAW converters software.
     

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