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efterbilder
efterbilder
Participating Frequently
October 5, 2023
Question

Purple tint when using AI Denoise on underexposed Fujifilm raw/raf (X-H2) files

  • October 5, 2023
  • 2 replies
  • 655 views

Hiho,

 

I was playing around with raw files from DPReviews exposure latitude tool (link) and noticed that when correcting for the - 5EV underexposure by pushing the same amount in Lightroom and then running AI denoise on the file the resulting DNG has a purple tint not seen in the original file. Settings for AI denoise doesnt matter, I tried 5, 10 and 20.

 

As I can't seem to attach the raw file it can be obtained by selecting the Fujifilm X-H2 as camera in the link and then changing the exposure to -5EV.

 

Is this expected behavior consider the circumstances with the raw file being severly underexposed or is it something that might need looking into?

 

For reference doing the same thing with a -5EV file from the Panasonic S1 doesn't result in any tint.

    This topic has been closed for replies.

    2 replies

    GoldingD
    GoldingD
    Legend
    October 6, 2023
    by pushing the same amount in Lightroom and then running AI denoise

    One thing to keep in mind. Many edits you might make prior to using AI Denoise might be ignored, or might require a new edit. Try running AI Denise before any Develop edits.

     

    GoldingD
    GoldingD
    Legend
    October 5, 2023

    On my ipad, I see no difference.

    Do you have a monitor profile issue?

     

    P.S. it would be helpful if you use the Insert Photo button instead of the Attachment button. That way the two images would be visible without having to open them separately, and would be visible side by side .

     

     

    efterbilder
    efterbilderAuthor
    Participating Frequently
    October 6, 2023

    Hi,

    I can't find a way to update my original post but here's the before superimposed on the after.

     

    The difference in tone is only there because I ran denoise, I've made no other adjustments.

     

    //Regards

    GoldingD
    GoldingD
    Legend
    October 6, 2023

    Better.

     

    Not seeing the purple.

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