Flat Field Correction not working after update

It would be great if we could populate our own libraries based on camera orientation and F-Stops which we can later apply to photos. This would be very helpful in being able to apply FCC to older photos we’ve shot.

@Pavan Kumar T S I just used FFC on a batch of images I had issues with previously.

What I found is it does work as intended now, but requires the calibration frame to be the first in the series, not the last.  Using it as the last caused Lightroom to choose the first image as the calibration file, resulting in calibration errors.

But FFC was correctly applied when the calibration frame was placed first, and it even corrected my low contrast images that it used to skip.

So thank you for working on this issue.  But wanted to point out that the position of the calibration frame as the first file still seems to be critical, not sure if that is something that still needs to be looked at.

@17529453 

Is there any update here?  This is a problem I'm still experiencing.  I took the time to provide examples, but haven't gotten a response since.

As you can see @Pavan Kumar T S , this is an issue a large number of LR users are experiencing, and this is only a fraction of the number I have come across on various photography forums.  Have you been able to review my examples?  Is this something Adobe will work to fix?  With film photography and at-home digital scanning become more and more popular, I think this is a feature that many users will be utilizing going forward and some optimization would be appreciated.

In my experience, what you are experiencing has always been the case. I used to assume that once it finishes without any error dialogs appearing, it was done with all of them. One day I happened to look at the folder where the images are and to my horror, only about half of the frames were corrected. Not a single error message about missed frames.

And frankly, that's one of my smaller issues with it. It will randomly start using a non-flat-field frame during a batch operation and then I end up with a lot of frames that have ghosts of the image LR used as flat-field frame. You want to undo the operation? No, you can't, for whatever reason this operation is not undoable. You can delete the files in the filesystem and force a re-sync to get the originals back but that's not how it's supposed to be. 

Another issue I've been having is a dramatic lightening of all my frames after the "correction". I have not verified whether this stems from the wrong flat-field frame described above but if not it's it should also be fixed. 

And as a general question that I'm fairly certain won't be answered: How does the flat-field correction work exactly? I spent quite a bit of time trying to learn how it's done so I could write my own and the way flat-field correction is supposed to work needs a dark frame to be used along with the flat-field frame. LR can only work with a flat-field image so I'm assuming it's doing something with masking? In any case, this is not an issue in and of itself. 

Hi! I tried Flat field correction with one image, and one calibration file and it worked fine. Please share a set of images on which this isn't working, along with a screen recording. Thanks!

I am experiencing a similar problem, although I didn't put 2+2 together that it occurred after the update.  Previously, I was able to easily apply FFC to a large number of negatives with a single calibration frame.  Now, if I try to do a large group, Lightroom will grab other non calibration frames and use them for calibration, creating ghost images in the .dng files.  Another issue seems to be that trying to do a FFC on negative that even slightly resemebles a calibration frame (e.g., an open landscape), Lightroom seemingly does not know which one is the calibration frame, so does nothing.  This is a major issue as FFC is essentially unusable right now and is important for the workflow of many people doing film scanning.  The FFC needs to be able to do the following:

1) the user should be able to tell Lightroom which frame is the calibration frame rather than the program making a guess and frequently getting it wrong.

2) the user should be able to force a FFC for any frame, rather than Lightroom mistaking a photo needing correction for another calibraiton frame and doing nothing

3) the user should be able to apply FFC to a large number of frames without it resulting in ghost images as Lightroom uses the wrong frame for calibration