Flatfield correction behavior

New Here ,
May 17, 2022 May 17, 2022

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Windows 10 64 with all updates, LrC 11.2

 

Long story short: Lr's FFC works not as described. Description tells that only first or last file in sequence is treated as the reference flat field frame, but actually every file is checked for uniformity, and if Lr decides that it is uniform enough to be treated as the reference - it is treated, and the next file treated as photo is corrected using this "new reference" file that actually is a real photo, just not-so-contrasty.

 

It leads to two issues:

- not all files are corrected

- if there is a file in the middle of the sequence that is not corrected, then files after (in the direction from real reference file) that file are corrupted.

 

Steps to reproduce:

- do as described in the guide: place a real reference file first or last in the sequence

- have one or more files with low contrast in the sequense

- perform FFC

 

ER: all files are processed using first or last file as reference.

AR: every file is checked for having low contrast enough to be treated as reference, and in case it is treated - all consequent files are processed using this file as reference, not the first\last.

 

Attached screenshots: with issue, and with hints where to look at. Take into account that LR processed files from the last to the first, as the reference is the last file in the sequence.

I can not attach photo file that is erroneously treated as reference because it exceeds allowed file size, but I can provide any files in some other ways if needed.

 

Just illustration

orig.png

 

The same with hints

hints.png

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Adobe Employee ,
May 17, 2022 May 17, 2022

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The team has looked at your post and asks if it would be possible for you to provide us the set of files. You can share them from Creative Cloud/Dropbox or similar. 

Rikk Flohr - Customer Advocacy: Adobe Photography Products

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New Here ,
May 17, 2022 May 17, 2022

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Sure, here it is (I hope it was shared correctly):

https://www.dropbox.com/sh/5k8too3h7rzhpxm/AACwF_3ltS51zWsPgbhkvdv7a?dl=0

 

CF028267 - correctable

CF028284, CF028301 - treated as the reference

CF028302 - correctable

CF028303, CF028304 - treated as the reference

CF028334 - correctable

PhaseOne IQ180 Mamiya 210 inf @ 11 - reference

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New Here ,
May 17, 2022 May 17, 2022

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Well, somebody downloaded it so many times that it caused my Dropbox limits to be exceeded. So let's try Google Drive.

For all who do not REALLY need these samples - please do not download it!

 

https://drive.google.com/drive/folders/1Yh-XCKtGHGdFGwfwzyoBGl4tDYk2yaQr?usp=sharing

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