Skip to main content
R
rqfugate
Participant
May 18, 2019
Question

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

  • May 18, 2019
  • 5 replies
  • 4213 views

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.

This topic has been closed for replies.

5 replies

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
    rqfugateAuthor
    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.

    Ian Lyons
    Community Expert
    Ian LyonsCommunity Expert
    Community Expert
    May 19, 2019

    The ExpoDisc is designed for white balance and has a non-flat knobby diffuser that may cause uneven illumination across the image frame. I'm sure it works fine for white balancing, but is pricey and really not designed for creating "flat field" image files. A simple lens a cap with a flat diffuser used with a neutral target such as a white balance card, a piece of white copier paper, or even a white wall should work better and is much lower cost. Make sure there are no shadows on the target and get close enough so that the camera's frame is inside the neutral target.


    https://forums.adobe.com/people/Todd+Shaner  wrote

    The ExpoDisc is designed for white balance and has a non-flat knobby diffuser that may cause uneven illumination across the image frame. I'm sure it works fine for white balancing, but is pricey and really not designed for creating "flat field" image files.

    Your description of the ExpoDisc and its intended use is fine. However, your other points are at odds with those who have some experience of using it with Flat Field. Put another way, had the info not come from the source that it did, then I would not have mentioned it.

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices