MWG::Regions\RegionInfo being set as pending writeback after a new or re-scan

[mlavicka]

     I'm not sure if this is a bug or feature request.  But I can't figure out how to scan (or re-scan) in photos without getting a pending writeback for MWG::Regions\RegionInfo.  I created all face regions with iMatch and write back all metadata to the file.  Then if I scan it in again, I get the pen icon for this RegionInfo.  This happens if I just rescan in the metadata, but also if scan for first time following a new database creation. I use Metadata Analysts to compare the metadata before and after the rescan, and it shows no difference in the "XMP-mwg-rs" metadata.
     This may or may not be related to a comment Mario made in a different post:
This behavior is by design. When it imports face regions, IMatch no longer "knows" that the file on disk may have XMP face regions. When XMP face regions are found, the existing PersonInImage data is dropped and, at some later time, recreated. Changing this behavior would be quite complex and "expensive".

My settings are:
  Metadata Working Group Compliance = Yes
  Automatic Face Recognition        = Yes        Automatically assign persons to faces = Yes
  Automatically confirm faces       = Never      Keep existing XMP                     = Yes
  Protect unwritten metadata        = No         Protect existing XMP                  = No
  Import XMP Face Regions           = Yes        Import XMP Face Regions in reverse order = No
  Export Face Annotations to XMP    = Yes        Export only confirmed person tags     = Yes

 

[Mario]

Why do you have a need to rescan files manually? Or need to create new databases?
IMatch databases usually last decades (my personal one was created in 2004)?

You have also modified several of the default metadata settings. Why?

[mlavicka]

Four main reasons for rescanning:

1) iMatch detects a folder change - I tend to move groups of files and folders around a lot, from within iMatch.  Occasionally, iMatch thinks the folder has a change by showing the "Folder needs refresh" icon.  I assume that this is just a timing mismatch of how long it takes to do the operation vs iMatch background checking of a folder change outside of iMatch.  So I just rescan the folder to fix it.

2) Undoing Metadata Changes - Sometimes I mess up the changes I wanted to make and just need a reset by rescanning in the previous state of the file from last write.

3) Not being dependent on centralized iMatch database - I store all of my photos in files that are automatically synced to the cloud (OneDrive).  I want to make sure that all data I care about is stored in the photo files, and that I am not dependent on an iMatch database to view it.  So I only use metadata that can be written back to the file and can be read by most software.  This is why I have changed the default settings to make sure the Metadata in the file is the "golden copy".

4) Changes made outside of iMatch - I try to minimize this, but if I make a change or just need to ingest new files with RegionInfo, then I will need to scan them in.

Regarding creating a new iMatch database.  This comes into play when I change platforms.  While my photos are stored locally and synced to the cloud, my iMatch database is exclusively on my local device.  So when I am home, this is my Desktop.  But when I travel, this is my Laptop.  So I don't deal with all the files involved with the "Pack & Go" option.  I just recreate the database on my laptop, and it reads in all the data fresh from the files.  When I return home after a long trip, I just recreate the database on my Desktop.  I never use my Laptop and Desktop at the same time.

The only other data that I need to properly recreate the database is the People data.  For that I export the JSON file and import it before scanning all the files.  As long as the Person Tag matches up, then everything works beautifully.

As a side note, I do a lot of work in photo genealogy where thousands of my photos are early 1900s that have been scanned from old photos or negatives.  I use the face recognition to help identify people in the photos.  I have a complex family tree that I try to keep in sync with iMatch People data.  It would be great if there was a way to maintain the people data in a genealogy program and then read it into iMatch, instead of having to manually maintain it in two places.