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Mark Zikra
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Noise Reduction output Issue

Mar 28, 2010 12:44 PM

Every time I apply noise reduction in LR3 Beta 2 the adjustments appear in the preview window in LR but as soon as I export as jpeg the processing dissapear.  It only happens with noise reduction - all other processing stays on the image.  Any Help?

  • Currently Being Moderated
    Mar 28, 2010 12:58 PM   in reply to Mark Zikra

    Hi Mark, how are you doing the "export to JPEG" step? Do you use the Export dialog, a custom Export preset, print to jpeg, etc.?



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  • Currently Being Moderated
    Mar 28, 2010 2:06 PM   in reply to Mark Zikra

    Can you please provide the raw file? Please use with a target email address of



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  • Currently Being Moderated
    Mar 28, 2010 8:20 PM   in reply to Mark Zikra

    Mark, just FYI. When you are in Develop, you do not get any preview of the noise reduction (and sharpening) when you are zoomed out as you appear to be here. They are simply not applied at all to make the display faster. This can lead to an image appearing far less (or far more in some cases) noisy than they actually are. You can only get to see noise reduction's effect when you zoom into 1:1 or higher in Develop. To optimize your noise reduction and sharpening, you HAVE to zoom in to 1:1 or higher. You will also see a preview of the noise reduction when you go the Library, but of course you don't get the develop controls there. Library shows the image from a jpeg preview generated using all your Develop settings including noise reduction. So, interestingly, the preview in Library is more accurate than that in Develop in some ways. Check what happens when you zoom in and when you go to Library. My bet is that it looks very similar to your jpeg export.


    Hope this helps.


    P.S. LR 3 beta (2) now shows a preview of the sharpening and noise reduction also in zoomed out views.

    Mark as:
  • Currently Being Moderated
    Mar 28, 2010 8:22 PM   in reply to Mark Zikra

    Also, you probably should be using color noise reduction on an image like that even if you go to black and white.

    Mark as:
  • Currently Being Moderated
    Mar 28, 2010 9:05 PM   in reply to Mark Zikra

    No you cannot trust the effects of sharpening and noise reduction at

    all when zoomed out to fit or fill. You can only trust it at 1:1 or

    higher in LR 2. You should not see any effect at all zoomed out. If

    you do see an effect, it is an artefact and Lightroom is lying to you.

    You should optimize the noise reduction and sharpening at 1:1 and

    ignore the noise and sharpness you see zoomed out in LR 2. This is a

    little silly but the root cause is the fact that your display is a low

    resolution device that simply cannot show you the effects zoomed out.

    So Lightroom doesn't even bother applying the effect in the zoomed-out


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  • Currently Being Moderated
    Mar 28, 2010 10:20 PM   in reply to Mark Zikra

    I understand the confusion. It is a shortcoming of low resolution

    displays which necessitates that a lower resolution image needs to be

    generated to show you a preview. Lightroom 3 tries to give you a

    preview that is quite accurate by using subpixel rendering, but

    Lightroom 2 gives you a particularly wrong preview in Develop which is

    a side effect of how the preview is generated. It uses a much lower

    resolution interpolated to the display resolution version of the image

    for speed reasons in the zoomed-out view. Often this shows you far

    more noise than is actually there because you do not get the averaging

    of pixels that you should get when you zoom out. Sometimes however, as

    in your case, it actually shows you less noise than is really there.

    Both are artefacts of the rendering choices made. Only when you zoom

    1:1 will you actually get a correct rendering of the image taking all

    the develop settings into account.

    Mark as:

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