P: Recalculate Face region(s) when source image has been cropped or rotated/mirrored (Web Module)

@johnrellis  I have placed it as the team requested. A ticket is created and tracked. If the team requests to move it to bugs, I will do so. 

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@Rikk Flohr: Photography, if the Web module isn't adjusting XMP face regions for cropped or rotated exported photos, that is a "bug" according to Adobe's definition -- LR isn't obeying the designed behavior publicly announced for Camera Raw 6.4 and LR 3.4. 

In March 2011, Adobe employee David Franzen announced that Camera Raw 6.4 and LR 3.4 would be obeying the Metadata Working Group Guidance:

https://www.lightroomqueen.com/community/threads/camera-raw-6-4-and-lightroom-3-4-public-betas-add-metadata-working-group-support.11522/ 

(See also his post below.)

The MWG spec defines how face regions are recorded in XMP metadata, and the spec requires that the regions should be adjusted when photos are cropped or rotated:

https://web.archive.org/web/20180919181934/http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf 

@MarkCulp  says the Web module adjusting face regions in exported photos, though the Export module does. Thus, the Web module wouldn't be obeying the MWG spec. By declaring the Web module's behavior "as designed" and not a bug, are the developers now withdrawing the public commitment to the MWG spec made in 2011, to keep their bug counts low?

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@Rikk Flohr: Photography: If the Web module isn't adjusting the face regions in the exported photos' metadata, that is a clear bug according to Adobe's definition of "bug" -- LR isn't obeying the as-designed behavior publicly announced years ago.

Adobe employee David Franzen announced in March 2011 that Camera Raw 6.4 and Lightroom 3.4 now followed the Metadata Working Group Guidelines:

https://www.lightroomqueen.com/community/threads/camera-raw-6-4-and-lightroom-3-4-public-betas-add-metadata-working-group-support.11522/ 

The MWG spec defines the XMP metadata fields for face regions and requires that the regions be adjusted when the image is cropped or rotated:

https://web.archive.org/web/20180919181934/http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf

The Web module isn't obeying the MWG spec to which Adobe committed, though the Export module does obey it. Has the LR team withdrawn their announced commitment to that spec?

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From: Photoshop Family <noreply.photoshop_family@getsatisfaction.com>
Sent: Wednesday, April 27, 2011 12:50 PM
To: Photoshop Family <noreply.photoshop_family@getsatisfaction.com>
Subject: New reply: "Lightroom 3.4RC not exporting XMP EXIF schema properties?"

David Franzen replied to Lightroom 3.4RC not exporting XMP EXIF schema properties?, a problem about Photoshop Family.

Lightroom 3.4 and Camera Raw 6.4 now follow the guidance provided by the Metadata Working Group for recording metadata in files that contain both native Exif and XMP packets. Photoshop CS5 was the first Adobe app to ship with MWG support, so Camera Raw and Lightroom are just catching up in this respect.

A specific example germaiin to this thread is that most Exif properties are now only written once, in the native Exif block, and not duplicated as XMP tags in the exif: and tiff: namespaces.

Where Exif properties are mapped to XMP properties outside the tiff: and exif: nameapsaces--for example the TIFF Artist tag is mapped to the dc:creator XMP property--the property values are kept in sync in both the native Exif and XMP (and native IPTC IIM for that matter).

You can find the complete MWG specifications here:
http://www.metadataworkinggroup.org/

WRT some of the other topics in this thread (like multi-byte text, and date-time handling)... well, the MWG specification really describes these issues better than I can, so I refer the technically curious to start there.

A good, Adobe-hosted, place to ask follow-up questions WRT the MWG and metadata handling might be the Adobe XMP developers forum: http://forums.adobe.com/community/des.... There may be other relevant, non-Adobe forums as well.

Go look at this reply

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Hmm, I'm not seeing that incorrect behavior. I took this photo with an identified face:

and cropped it:

and exported it with all metadata and then imported it back into the catalog. That newly imported photo shows the same location of the face rectangle.  Exiftool shows that the XMP description of the region in the original photo:

[XMP]           Region Rotation                 : 0.00000
[XMP]           Region Name                     : Jamie
[XMP]           Region Type                     : Face
[XMP]           Region Area H                   : 0.16211
[XMP]           Region Area W                   : 0.24340
[XMP]           Region Area X                   : 0.52639
[XMP]           Region Area Y                   : 0.21680

has been adjusted in the exported photo:

[XMP]           Region Rotation                 : 0.00000
[XMP]           Region Name                     : Jamie
[XMP]           Region Type                     : Face
[XMP]           Region Area H                   : 0.31174
[XMP]           Region Area W                   : 0.35340
[XMP]           Region Area X                   : 0.31236
[XMP]           Region Area Y                   : 0.41690

To make progress on understanding what you're seeing, select the original, cropped photo and do Metadata > Save Metadata To File, and then export it. Upload the original photo (and it's .xmp sidecar if it's raw) and the exported photo to Wetransfer, Dropbox, Google Drive or similar free service and post the sharing links here.