Canon EOS 40D High ISO Noise Reduction Test

The 40D has a new custom function that allows you to set noise reduction for high ISO. I have made some test shots comparing shots from ISO 800 to 3200 with noise reduction off and on. The following are 100% crops, the left side crops had noise reduction turned off and right side crops had noise reduction turned on.

ISO 800


ISO 1600


ISO 3200


To see the full 40D review, click here.

4 thoughts on “Canon EOS 40D High ISO Noise Reduction Test

  1. Were these captured in jpg or raw and then converted?
    Perhaps the high ISO noise feature only affects jpgs…
    I shoot in jpg+RAW and can see a difference in my high iso jpgs but not in my raws.

    Perhaps, if you shoot raw+jpeg, you could also post the same crops of your jpegs?

  2. I don’t see any difference… but I do echo Andrew’s question: does the high ISO noise reduction apply only to jpegs, or to jpegs and RAW? I’ve heard conflicting reports, which is kind of wierd. Image processin in-camera typically is only applied to jpeg (then interpreted for RAW by, in Canon’s case, DPP). I get conflicting reports about the “new” High ISO Noise Reduction”. What are the facts? If you take a pic in RAW with this feature off, take one with this feature on, then import them both into, say, Lightroom, will they be the same, or different?

    I have the same question about Highlight Priority: JPEG only, or RAW?


  3. Pingback: EOS TRULY. A CANON SHOWCASE. « A Moment Lived. A Journey Shared.

  4. From Canon’s recent white paper Guide for Custom Functions and Camera Settings for the mark III

    High ISO Noise reduction only Combats chrominance noise (the colored dots/pastel like color deviations) while not affecting luminance noise (dot like noise, ‘salt and pepper’ speckles). It reduces the amount of colored speckles, while leaving luminance noise alone as that must be blurred away, potentially reducing resolution.

    Also High ISO noise reduction only effects JPEG images, as it said, no processing is done whatsoever to RAW images, you’ll need to do your own noise reduction in DPP or photoshop.

    Though even if you set the output to RAW only it still reduces the cameras image buffer as it still processes the image to make the embedded JPEG image for the RAW file, so if you shoot exclusively in RAW it might be best to turn off High ISO noise reduction. (Though I may be incorrect on this last point, its based on whats said in the PDF and experience with the 40d)

    Highlight Tone Priority from my understanding is Both JPEG and RAW as it adjusts the (tone curve? exposure?) bias towards highlights in order to get more detail in the upper end.

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