Metadata change warning...

Similar Questions

• Selection of photos by smart status overview, metadata changed, etc.

  I want to be able to select the photos inside Lightroom based on criteria including the debt program but don't let not select you, for instance without previews images, smart shots that have had their metadata changed outwardly, etc..  The system knows what images they are but don't let not consider you a set or act upon them as a whole (building previews smart, AFAIK requires a manual selection in a universal operation or a set catalogue up-to-date, you cannot select only those without intelligent insights).  Because the system keeps track of the State, it would be nice if you could choose this status to view or act upon them as a set.  If anyone knows how to do this, I would appreciate it.

  David

  You must look smart Collections. Two of these examples are available in the smart collection criteria.

• Relocation of Lightroom: metadata changed / conflict

  I recently had to restore the factory settings on my computer.  It was uninstall and reinstall Lightroom.  After this painful process, my images now have one of the two alarming icons in the upper right corner.

  I understand that these indicate:

  • pointing arrow up: metadata was changed externally
  • exclamation point: metadata a conflict

  Which ever I press, I get the same error message.  Please see the image below:

  

  Some images I edited in Lightroom only and others I exported to Nik or Photoshop to change.

  Whatever it is, I want my images to keep the changes that I made.  And I would do a lot to change so that I don't have these arrows upward and the exclamation marks on any of my images in the catalog.

  FYI - my Lightroom Catalog is on an external drive.

  I do not understand what is meant by "Lightroom should import the settings of disc or replace drive with the catalog settings"?

  Would be happy to help with this.

  As a general rule, all of your changes to the image and changes to metadata are stored in the Lightroom Catalog.  Depending on the options that you have defined, and if you have invoked some orders, changes and metadata can also be stored in files or in sidecar .xmp (for the raws).  So when you have restored your computer, as long as you used the latest version of your catalog folder, you have all of your changes and metadata.

  The icon 'Metadata has changed outside' means that LR think an external application changed the metadata from the image file after the last time that a change has been made in LR.

  The icon 'Metadata a conflict' mean that LR thinks that, since the last time RL read the metadata of the file, the changes to the metadata of the image has been made within the LR and by an external application.

  I think what happens is that the process of restoring your computer has changed the date of last modification of most of your files (this is the date maintained by OS X and Windows, whenever a file of any type is changed).  This change dates of confuses LR.

  Assuming that this is what happened, it is relatively harmless.  To get rid of the warning icons, select all images and make the metadata > save metadata to file.  If you have a very large catalog, this could take a long time to complete, and it may cause your program to backup re - backup images. However, to be on the safe side, I recommend making sure that you have a backup of the two catalog folder itself and your image of all files before you do.

• How the metadata change by Lightroom and another application?

  I often get the message "the metadata for this photo has been changed by Lightroom and another application. Lightroom import settings from disk or replace drive with the catalog settings? "on the images in my catalog. I only use Lightroom to organize, add keywords, basic settings, etc.. On occasions, I take a picture in Photoshop to work more, it is exported in a TIFF or PSD file and the original stays in the catalog LR blank any other thing I could do to the image.

  I have two choices with this message: settings to use Lightroom, OR crush them to disk. The first time it has scared me, as I had no idea where these changes were and why the disk file was something different that lightroom catalog. I have all my metadata stored in XMP files. But I took the chance and said: replace the LR settings and didn't change anything on the sliders or the displayed image. I then tried a little saying 'Keep the LR settings', and again, I didn't see any visible signs of changes. This leads me to believe that they are NOT changed but things LR, they are somehow. But I do not see it, I want it to go away unless there really changes happening outside of LR (as if I went to the bridge or something...)

  Any ideas why this message? I just discovered approximately 100 images in a collection of images, I sent to the Agency in stock three years ago and have not done something with them outside LR since.

  Thanks for any help you can give.

  Users have complained for years about the fake notifications of metadata has changed.  If you are convinced that you do not change the file itself outside LR, then choosing settings Overwrite will rewrite the metadata in the file with the metadata for catalogue and (usually) to make the fake notification disappear.

  Unfortunately, LR does not tell you the metadata fields have been changed, so that users are left flying blind.  In my opinion, Rob Cole had a plugin that will tell you the metadata for the differences between the catalog and the disk file, but its Web site has been down for a couple of weeks now.

  ManiacJoe: My guess is that Photoshop updates some fields of EXIF data in the raw, for example the "edited with the software" file field. Given that Lightroom has probably already established in this field, it gives you a warning that something has changed.

  Interesting hypothesis.  I just tested with LR 5.7.1, Photoshop CC 2014, OS X 10.10 and could not reproduce the problem.  I have exported a TIFF file to a raw file that is catalogued in the same folder as the raw, TIFF edition and changed some of its metadata in Photoshop, and saved.  LR didn't report a notification of change-a metadata.

  In general, I'd be surprised if you changed x.tif in PS, it would change all the metadata in x.cr2 or x.xmp (moderately).

• The songs that have had their metadata changed in iTunes have disappeared from my iPhone

  I'm a music Apple and iTunes game iCloud user of the music library. Suffice it to say that aloud, it occurs to me that this stuff is a mess and may expect that this works correctly are just wishful thinking.

  I use Apple's music since the day wherever she launched. Recently, as in the last two weeks, I noticed that some albums on my iPhone was missing songs. In any case, I think that the missing songs are the ones where I edited the title of the song and possibly other metadata in iTunes. It is difficult for me to check if ALL the Apple music songs where I edited the title are messed up now, but it goes back far enough, certainly before I began to experience songs that disappears.

  To give you a concrete example, some time ago, I added the 2pac album "2pacalypse Now." In the Apple's music, this album lacks all the features of the song of songs, so I added back in. For a while things were fine, but recently the songs where I added the functionality for the title of the song disappeared from my iPhone. Now, all I see are five titles that do not have features and a link to "Show full Album" down.

  I spoke with @applemusichelp on Twitter last night and they asked me to turn off music Apple and iCloud music library on my iPhone, reboot the phone, identify new in music Apple and reactivate iCloud music library. Did not work. Their recommendation then was, "Don't change the metadata for the Apple music titles in iTunes." To which my answer was: "so why iTunes allows you to edit metadata for pieces of Apple's music in the first place?"

  Anyone else having this problem? Someone at - it a solution?

  As I said in my recently published issue, the songs have not disappeared. They are still there, but they appear as "Unknown artist" and "Unknown Album" (you can search for them browse by 'Songs' rather than the 'artists' or 'Albums'). This is an extremely annoying bug that I wish that they difficulty - I loved the Apple music was the fact that I could edit the tags...

• Why metadata changed?

  Suddenly, my library catalog of ~ 50 000 images indicated that almost every picture requires update metadata. Only a few jpg files does not show this.

  So, what has changed the metadata in Lightroom? Any suggestions?

  

  I've included the complete difference in lists of the 'exiftool - a - G' output below (personal information that have been omitted).  Observed Trshaner .jpg has changes to the root of the hierarchy of keywords, so the .dng has new keywords and copyright info added.  You did recently these changes?

  $ diff IM000014.txt IM000014-copy.txt
  3c3
  < [File]          File Name                      : IM000014.jpg
  ---
  > [File]          File Name                      : IM000014-copy.jpg
  6,7c6,7
  < [File]          File Modification Date/Time    : 2016:07:17 08:42:56-07:00
  < [File]          File Access Date/Time          : 2016:07:17 08:42:56-07:00
  ---
  > [File]          File Modification Date/Time    : 2013:08:18 02:21:44-07:00
  > [File]          File Access Date/Time          : 2013:08:18 02:21:44-07:00
  14c14
  < [File]          Current IPTC Digest            : 74bc1ff637ad44013af214864bddd502
  ---
  > [File]          Current IPTC Digest            : f4bd09897c7dfa3dc151b48cc8b05e0f
  74c74
  < [XMP]          XMP Toolkit                    : Adobe XMP Core 5.6-c011 79.156380, 2014/05/21-23:38:37
  ---
  > [XMP]          XMP Toolkit                    : Adobe XMP Core 5.5-c002 1.148022, 2012/07/15-18:06:45
  78c78
  < [XMP]          Metadata Date                  : 2016:07:17 18:42:57+10:00
  ---
  > [XMP]          Metadata Date                  : 2013:08:18 12:21:45+10:00
  81,83c81,83
  < [XMP]          Instance ID                    : xmp.iid:d09152ec-5ab4-f949-8b09-9fc5a7599dbf
  < [XMP]          Document ID                    : xmp.did:d09152ec-5ab4-f949-8b09-9fc5a7599dbf
  < [XMP]          Original Document ID            : xmp.did:d09152ec-5ab4-f949-8b09-9fc5a7599dbf
  ---
  > [XMP]          Instance ID                    : xmp.iid:d863108d-e3f6-9347-9492-9f68c5ef2715
  > [XMP]          Document ID                    : xmp.did:d863108d-e3f6-9347-9492-9f68c5ef2715
  > [XMP]          Original Document ID            : xmp.did:d863108d-e3f6-9347-9492-9f68c5ef2715
  85,86c85,86
  < [XMP]          Hierarchical Subject            : WHAT #|TRANSPORTATION|Motoring|Sports Cars
  < [XMP]          Subject                        : Motoring, Sports Cars, TRANSPORTATION, WHAT #
  ---
  > [XMP]          Hierarchical Subject            : TRANSPORTATION|Motoring|Sports Cars
  > [XMP]          Subject                        : Motoring, Sports Cars, TRANSPORTATION
  88,90c88,90
  < [XMP]          History Instance ID            : xmp.iid:d09152ec-5ab4-f949-8b09-9fc5a7599dbf
  < [XMP]          History When                    : 2016:07:17 18:42:57+10:00
  < [XMP]          History Software Agent          : Adobe Photoshop Lightroom 6.6 (Windows)
  ---
  > [XMP]          History Instance ID            : xmp.iid:d863108d-e3f6-9347-9492-9f68c5ef2715
  > [XMP]          History When                    : 2013:08:18 12:21:45+10:00
  > [XMP]          History Software Agent          : Adobe Photoshop Lightroom 5.0 (Windows)
  94c94
  < [IPTC]          Keywords                        : Motoring, Sports Cars, TRANSPORTATION, WHAT #
  ---
  > [IPTC]          Keywords                        : Motoring, Sports Cars, TRANSPORTATION
  97c97
  < [Photoshop]    IPTC Digest                    : 74bc1ff637ad44013af214864bddd502
  ---
  > [Photoshop]    IPTC Digest                    : f4bd09897c7dfa3dc151b48cc8b05e0f
  

  $ diff 20151201-RHC-D750-7461.txt 20151201-RHC-D750-7461-copy.txt
  2c2
  < [File]          File Name                       : 20151201-RHC-D750-7461.dng
  ---
  > [File]          File Name                       : 20151201-RHC-D750-7461-copy.dng
  5,6c5,6
  < [File]          File Modification Date/Time     : 2016:07:17 08:46:22-07:00
  < [File]          File Access Date/Time           : 2016:07:17 08:46:22-07:00
  ---
  > [File]          File Modification Date/Time     : 2016:01:25 01:59:42-08:00
  > [File]          File Access Date/Time           : 2016:01:25 01:59:42-08:00
  29d28
  < [EXIF]          Artist                          : Robert Cullen
  106d104
  < [EXIF]          Copyright                       : © 2015 Robert Cullen
  191c189
  < [XMP]           Metadata Date                   : 2016:07:17 18:46:23+10:00
  ---
  > [XMP]           Metadata Date                   : 2016:01:25 12:59:42+10:00
  201c199
  < [XMP]           Instance ID                     : xmp.iid:63e10763-4031-e147-a9b8-385b11ed7efa
  ---
  > [XMP]           Instance ID                     : xmp.iid:49c73e7b-e9dc-0445-aca9-1cf8faf7fb36
  203d200
  < [XMP]           Marked                          : True
  207,209c204,206
  < [XMP]           History Instance ID             : xmp.iid:94fa275c-82cd-8c40-98c4-6117d63708e3, xmp.iid:63e10763-4031-e147-a9b8-385b11ed7efa
  < [XMP]           History When                    : 2016:01:25 12:48:25+10:00, 2016:07:17 18:46:23+10:00
  < [XMP]           History Software Agent          : Adobe Photoshop Lightroom 6.3 (Windows), Adobe Photoshop Lightroom 6.6 (Windows)
  ---
  > [XMP]           History Instance ID             : xmp.iid:94fa275c-82cd-8c40-98c4-6117d63708e3, xmp.iid:49c73e7b-e9dc-0445-aca9-1cf8faf7fb36
  > [XMP]           History When                    : 2016:01:25 12:48:25+10:00, 2016:01:25 12:59:42+10:00
  > [XMP]           History Software Agent          : Adobe Photoshop Lightroom 6.3 (Windows), Adobe Photoshop Lightroom 6.3 (Windows)
  213,222c210,211
  < [XMP]           Creator                         : Robert Cullen
  < [XMP]           Rights                          : © 2015 Robert Cullen
  < [XMP]           Usage Terms                     : All Rights Reserved
  < [XMP]           Creator Postal Code             : ...
  < [XMP]           Creator Work Telephone          : ...
  < [XMP]           Creator Region                  : ...
  < [XMP]           Creator Country                 : ...
  < [XMP]           Creator City                    : ...
  < [XMP]           Creator Work Email              : ...
  < [XMP]           Creator Address                 : ...
  ---
  > [XMP]           Subject                         : Decoration, LECTURES, LIGHT, NATURE, Night, PLANTS, Trees
  > [XMP]           Hierarchical Subject            : Decoration, LECTURES|LIGHT, NATURE|PLANTS|Trees, Night
  

• Metadata changes

  I created a Smart Collection in LR 5.2 with the following criteria, using ALL the rules: status of metadata is conflict detected + metadata status is changed on disk. The goal is to catch all the photos that have been processed by other applications. This works well up to a point. He pointed out all the videos as being changed - where I've added keywords later. As I could not fix with indicator videos, removed all of LR and re-imported, assuming that the flags would be fixed. However, they still appear as changed externally. How can I fix?

  LR does not support metadata correctly status for video files, as you have discovered.  I just filed a bug report:

  http://feedback.Photoshop.com/photoshop_family/topics/bugs_with_video_metadata_status?RFM= 1

  Please add your vote and opinion.  If you don't have an account with the official forum of your comments, see this FAQ:

  http://feedback.Photoshop.com/photoshop_family/topics/how_do_i_register_a_new_account_for _ this_photoshop_com_forum

  You can work around the bug by improving your smart collection:

  

  To add the nested "All" the rules, hold ALT / Option and click on the '+' to the right.

• How to Bridge and Lightroom to respect - read - metadata changes?

  I have my images of marriage in bridge (6 CS) of the reform and then export them into LR 4.  I usually rate the images I started to reform, but when I import these images in LR, the sides are not.  Similarly, when I tag the images in LR and export, bridge shows all white color labels - no matter what the label was actually awarded.

  LR saves all changes and other changes to metadata in its database (= catalog).

  In addition to the catalog, you can , namely a xmp (in the case of a Raw photo) file, or in the header (but not in the pixels of the image!) of a JPG, TIFF or PSD.

  Backup to the folder is

  _ either check the box > Edit > catalog settings > metadata tab, or manually

  _ by going > metadata > save metadata to file (in the Lr library Module), or

  _ by going > Photo > save metadata to file (in the develop Module.

  When you manually save the file, you can select several photos in the grid view and .

  This saving to the file is necessary so that bridge can read and display changes to Lr, because the bridge is unable to read the Lr catalog.

  Bridge of saved file automatically (there no option of deselection of her) and Lr will read the bridge metadata when you import the image in Lr.

  In the case of an image that is already in Lr, you must select > metadata > read metadata from file (in Lr library Module), or

  going > Photo > read metadata from file (in the develop Module). Without this , Lr displays all changes made to the bridge after importation in Lr. Since this would replace all the different changes that you made in Lr, it is best to do this before you more editing in Lr.

  The rating stars would transfer of bridge to Lr and vice versa without problems.

  For color labels to properly transfer you must make textual descriptions for individual colors identical to Lr and bridge - to upper/lower case, commas, and hyphens, underscores, traits, etc..

  That being said:

  I would recommend that you use no bridge for the slaughter of your images. You can make easy logging to Lr. When you manage photos in Bridge and in Lr, you will always have the problem of synchronization of metadata. This can be done, but it needs a flow of meticulous work that is strictly adhered to.

  There is nothing in the deck than Lr only *). Simplify your life, choose Lr as your only management and image editing tool, with the exception of CS6 itself (I want to say Photoshop itself, not the ACR).

  *) Well there is one thing: since Lr is not a program based on a browser, it does not automatically "see" what's on a hard drive. Photos must be imported so that Lr will 'see' them.

  Bridge is browser-based. Which photo is saved on a hard drive - regardless of what program to put there - it will be "seen" by bridge.

  Bridge is a valuable tool if a photo is not displayed in Lr and want to check if it is in a particular folder.

• Not applied to all the selected images metadata changes

  I have 2 problems.

  When I'm in the lightroom library (3.5), I want to change the time of the capture of several photos, apply keywords.

  However, when I perform one of these actions, the changes are only applied to the image displayed in the image "brighter highlighted", not all that are selected.

  Is there a setting I'm missing?  I can't understand why it does not work.

  Also, I aplogize if my search skills are weak, and this has been covered already.  I tried to see if this question has been answered before posting.

  Thank you.

  You must be using grid to apply metadata to all of the selected images, otherwise LR only apply it to the image displayed in the main area. You can also on AutoSync swith in the library.

  Also, I aplogize if my search skills are weak, and this has been covered already.  I tried to see if this question has been answered before posting.

  I don't think it's your skills that are weak, but the search function of this forum...

  Beat

• Lightroom 2.  Main catalog on the road metadata changes

  I tried to find the answer to this in the forums, but cannot, so forgive me if this question was asked a million times.

  I'm going on the road with my laptop and will not take along my hard drives.  I want to copy my main catalog on my laptop, take it with me and add metadata (especially keywording and captioning) to files on a trip.  I won't have the DNG, JPEG, PSD, files etc. with me - only catalog.  I want then to come home and incorporate these changes in the catalogue on my desk when I get back home.

  Is this possible?  It must be.

  Thank you.

  If you not add pictures to the catalog if it is on the laptop and it will not work with the catalogue on the main computer, even if you have a version of the catalog on your laptop, then the easiest way is to copy the catalog (lrcat on PC or Mac file) and the directory previews (a single file on Mac) on your laptop. Your laptop, you will see your photos in the preview files and will not be able to use the slideshow, print, and web modules or develop. You will be able to apply keywords and metadata and build regular and smart collections in the library module, but you will not be able to move a file from one folder to another. Once you have finished, copy the catalog (lrcat) to your main computer file; to be on the safe side, make a backup of the file lrcat on your computer before transferring of your laptop.

  The strategy above could also be used if new photos are added on the laptop, but in this case you would need to make sure that you use the same structure of folders on the main computer and the laptop and you must manually copy the photos newly imported on the laptop to the exact same directory structure on the main computer when the work is done. It implies, there is no simultaneous work on the two catalogs because this would require a completely different strategy.

  Finally, if you have keyword presets and other presets for metadata that you want to use, you need to transfer these institutions. The presets will be either stored in a folder with your catalog or in a record established by Lightroom. You can determine the location by choosing preferences from the Edit menu and select the Presets tab. Tab preset button "Show Lightroom Presets folder...". "will show you the location of the presets and the"store pre-configured with catalog"allows you to change the location of the folder of presets to be alongside your catalog. Note that having the folder predefined alongside your catalog is the best choice if you are using a single catalog that it facilitates backup and restore operations. Note also that the change of the location of the predefined folder does not move files preset to the new location; This is a manual operation.

  I hope this helps. Let me know if something remains unclear.

• I moved the files in Lightroom 5 from one drive to another (created the new folder and dragged).  Now I see warning of metadata.  What has caused this?  Can I import or rewrite the difficulty catalogue?

  I am reorganizing lots of photos in Lightroom 5.  Some who were on my hard drive, I moved to an external drive.  I did all this in Lightroom.  I created a new folder on the hard drive, external, selected all the images in the folder on the hard disk, trained to the new folder.  Made sure they were there.  Then deleted the folder on the hard drive.  When I looked in Windows Explorer, the (empty) folder was still on the hard drive, so I deleted it there too.  Now, I get the warning on the images in the new folder metadata were changed in Lightroom and an external program.  The options are to import from disk or rewrite from the catalog.  I would like to know what caused this and how to fix it.

  Thanks for the clarification of Nancy.

  The warning of "metadata conflicts" is an indication that Lightroom "sees" a discrepancy between the data in its catalog and the data in the image file (or in the xmp file) on the real situation which could be due to permissions at the new location.

  You should choose the option to replace the parameters, that is, rewrite in the Lightroom Catalog can write changes to metadata of the catalog itself.

  (Import of the disc would cancel the metadata changes that you did until now)

• How to trace changes in Dimension Metadata

  Hi all

  I wonder what the best approach is to check the dimension metadata changes,

  I need to run the update on very large dimensions of planning, and I want to trace about the change

  After I have update the cube and see which members have been added/moved etc.

  I know that I can use smart view quries but I'm little tworrie miss this way changes

  I think to export pattern dim in a table before the update

  and then run the update and export the new Sun update again to another table

  ultimately, I have two tables before and after, and I will be able to run a query to trigger the differences

  What do you think it'll work?

  Thank you

  Messi

  If means just restart the planning service.

  Audit information will be written to the relational database HSP_AUDIT_RECORDS table.

  You will need some kind of tool to see for example SQL Developer, SQL Server Management Studio, Excel using ODBC connection.

  See you soon

  John

• Change dFormat, metadata using RIDC dConversion

  Hello world

  I try to change the metadata dFormat and dConversion using RIDC...

  I invoke CHECKIN_NEW service like that...

  .....

  Customer IdcClient = getIdcClient (username);

  DataBinder dataBinderReq = client.createBinder ();

  dataBinderReq.putLocal ("IdcService", "CHECKIN_NEW");

  dataBinderReq.putLocal ("dDocTitle", doc.getTitle ());

  dataBinderReq.putLocal ("dDocName", doc.getDocumentId ());

  dataBinderReq.putLocal ("dDocAuthor", username);

  dataBinderReq.putLocal ("dDocType", doc.getDocType ());

  dataBinderReq.putLocal ("dRevLabel", "1");

  dataBinderReq.putLocal ("dSecurityGroup", doc.getSecurityGroup ());

  dataBinderReq.putLocal ("doFileCopy", "0");

  dataBinderReq.putLocal ("dCollectionID", doc.getContentId ());

  dataBinderReq.putLocal ("dFormat", "application/pdf");

  dataBinderReq.putLocal ("dConversion", "xxx");
  

  dataBinderReq.addFile ("primaryFile", dPrimaryFile);

  severiceResponse = client.sendRequest (new IdcContext ("username"), dataBinderReq);

  DataBinder dataBinderResp = severiceResponse.getResponseAsBinder ();

  .....

  I want an image file archiving and I want to convert PDF file by dFormat metadata change. This invoke does not work, because the University Complutense of MADRID made a conversion in the form of image/jpeg file.

  Any idea?

  Kind regards.

  Carlos

  Hello

  I found a solution!

  I changed the format of metadata to CRMI. You must set the following property:

  dataBinderReq.putLocal ("primaryOverrideFormat",")<>

  
  

  Thanks for all!
  

  Carlos
  

  
  

• Import of catalogue - metadata

  Hello

  I exported a bunch of images in the catalog on my desktop PC. On my laptop, I import that catalog into an existing catalog.

  So far, as expected. However, on all images I added in this way, I get a warning from metadata. I did not write metadata in xmp on my laptop or desktop. If I told you to fix the problem, she writes a xmp.

  To my knowledge he must simply store the metadata for the catalog and do not ask to write an xmp otherwise defined in preferences.

  What did I miss?

  Thank you

  McL

  BTW: I'm on 5.4 on Win7

  If the metadata warning badge, the arrow is pointing down, then it isn't really a problem to fix. Because you write automatically XMP, as soon as a metadata change is made to an image metadata status would then become "metadata catalog Lightroom are more recent than the original file, which is just what you said a badge.

  For users who have the autowrite to XMP option enabled in the settings of the catalogue, this warning should not be considered as the catalog and metadata of the file must always be in harmony. For users who do NOT have autowrite to XMP enabled. but who do not like to manually save metadata via the command Ctrl + S, this indicator of status of metadata is a useful way for them to determine that the metadata has been updated and that they should do that Ctrl + S.

  For users like me who never write XMP in their files, or open their files in other programs outside of Lightroom, this warning is redundant. Fortunately Lightroom allows to disable this WARNING badge Display Options menu, which is what I'm doing...

  Then maybe you simply have the Option to display defined differently on two systems?

• Change of date/time...

  I have a question about the change of date and time... Thank you very much in advance.

  I have. CR2 files and I want to edit the news ' date time original "... I want to change this info in the raw file, so I clicked on the checkbox "write date or time changes to in files gross owners ' in the catalog settings window... and then, after the change date and time with the 'edit capture time', Lightroom wants to save the changes, and after clicking the arrow on the thumbnail It creates a file. If date/time change is to write directly to the raw (because of catalog above settings) file, why does the Lightroom create sidecar .xmp file?

  There are two things going on here.

  1. When you change the capture date/time (Date time Original), the change is immediately reflected in part EXIF metadata Panel in the library module. Because it is a modification of metadata, the arrow of the warning appears on the thumbnail (if you have configured to display display options)... and by clicking on this button brings up the dialog box "metadata changed, want to check the disk. Note that this happens when you do any type of metadata change, not simply by changing the date and time. At this point, you can either decide to write the metadata to disk, or not... If you write that replaces your XMP metadata I assume you mean 'Save', but if you don't then just ignore it. Of course if you say 'Save', then Lightroom will do as requested and write metadata, that if it's a DNG, JPEG, TIFF etc., metadata are written in the XMP in the file header section... but if it's a RAW owner then it is written in a sidecar XMP.

  2. the second thing is that if you have the ability to set in the catalog settings to save the changes to the date and time in the raw files owners, then the change you make is reflected in the Raw file... it is a different change to the updated XMP.