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rqfugate
Participant
May 18, 2019
질문

Anyone get Flat-Field Correction to work? - LR Classic 8.3

  • May 18, 2019
  • 5 답변들
  • 4213 조회

What am I doing wrong? Position Calibration file and RAW file next to one another in the Library Grid view. Select both files. Library ->  Flat-Field Correction -> default boxes checked. No DNG file produced. Progress bar runs in a few seconds. Nothing comes out. No error messages. No DNG file anywhere on the computer. Tried checking other boxes in the dialog - no change. Same on both Desktop and Laptop same behavior. Mac OS 10.13.6. Stumped.

이 주제는 답변이 닫혔습니다.

5 답변

GoldingD
GoldingD
Legend
May 26, 2019

Ahh a much much better discussion on how:

Adobe Flat Field

    Todd Shaner
    Todd Shaner
    Legend
    May 26, 2019

    I already posted that link in my reply #8 above. As I suggested let's continue the discussion at the above mentioned Photoshop Family post. This is the best way to get Adobe's attention and have them address the current usability issues with the Flat Field correction tool in LR Classic.

    GoldingD
    GoldingD
    Legend
    May 25, 2019

    Having looked at:

    https://laurashoe.com/2019/05/14/whats-new-in-lightroom-classic-8-3-may-2019-release-new-features-and-more/#flat

    Are you sure that the DNG file was not created and the original RAW file removed from the catalog, and you are looking at the new DNG?

    Todd Shaner
    Todd Shaner
    Legend
    May 26, 2019

    davidg36166309  wrote

    Having looked at:

    https://laurashoe.com/2019/05/14/whats-new-in-lightroom-classic-8-3-may-2019-release-new-f eatures-and-more/#flat

    Are you sure that the DNG file was not created and the original RAW file removed from the catalog, and you are looking at the new DNG?

    A request to retain the original raw file in the catalog along side the Flat Field DNG file has been made at the below Problem report. I also added the issue of astrophotography images being detected as calibration frames. Please add all further comments at the below link along with your 'Me To' vote and 'Follow.' Thank you.

    New Flat-Field Correction DNG should not remove/replace the original RAW in the catalogue | Photoshop Family Customer Co…

    GoldingD
    GoldingD
    Legend
    May 25, 2019

    Looks like part of the issue is the clear as mud instructions at Adobe,at least the following one:

    Flat-Field Correction

    First or last image included in a selection of images to be corrected must be the calibration frame. Lightroom attempts to if determine first or last is it, chooses one, and treats either those following it as normal, Just how does LR determine that, and what if it gets it wrong. And does our sort order effect what lightroom thinks is first or last. And just how to create the calibration frame.

    So, on to searching for better info?

    Here is one, hmm, this is where I noticed an expo-disk mentioned;;

    https://lightroomkillertips.com/may-2019-update-for-lightroom-classic-lightroom-and-adobe-camera-raw/

    That page seems to treat this a a one image correction.

    Oh and:

    https://laurashoe.com/2019/05/14/whats-new-in-lightroom-classic-8-3-may-2019-release-new-features-and-more/#flat

    GoldingD
    GoldingD
    Legend
    May 18, 2019

    I see that some of the Adobe online directions were calling for or perhaps. recommending using a plastic diffuser card, an an example of that would be a Expo-Disk (and now I cannot provide a reference on that).

    One source talks about using a flat white wall.

    Adobe Flat Field

    R
    rqfugate작성자
    Participant
    May 18, 2019

    New information.

    On my computer:

    Flat-Field Correction works on .RAF Fuji files and Nikon D810 .NEF files but NOT D850 .NEF files.

    GoldingD
    GoldingD
    Legend
    May 18, 2019

    To ask a dumb question, And, no, I have not used this yet, so perhaps very dumb.

    For the D850, you used a calibration image specific to that camera and the lens in question? Not using one shot in the D810.

    Different metadata for camera.

    Todd Shaner
    Todd Shaner
    Legend
    May 19, 2019

    Thanks, everyone for the suggestions. Todd put me onto the following.

    As an astrophotographer I make lots of FLATS to calibrate my astro shots. Usually use the evening or morning twilight sky as a flat source. When I am in a bind and use the computer screen I also use a diffuser or fine vellum paper. The lens or telescope is focused at infinity so I get no artifacts at all - the file is very, very smooth. The computer file I have been using is like that. I have also made some flats with an expo disk on another lens (it is only 77 mm and doesn't fit the 105mm aperture) and as long as I am not trying to correct a nighttime sky image or daytime cloudless sky it works. It works on landscape images just fine. So the process does seem not to work on nighttime astro raw images, which is the only application I really have for Flat-Field Correction. A disappointment.

    However, I have discovered that if I convert the RAW astro to a TIF, it works on astro images. Now that is not an extra step I want to make since I usually stack 30 or more sky images. It seems Adobe needs to make this simpler. Don't know what they are doing behind the scenes but whatever it is it is not allowing the process to work on night sky shots.

    I will contact Adobe and put this info into their hopper and hope that someday something will come out the other end.

    Thanks, everyone for your suggestions.


    rqfugate  wrote

    I will contact Adobe and put this info into their hopper and hope that someday something will come out the other end.

    rqfugate please post this as a 'Problem' in the Photoshop Family forum at the below link. Paste the link to that report in a reply here so others can add their comments and 'Me To' vote. Thank you!

    Post a Conversation | Photoshop Family Customer Community

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