Why LIGHTROOM changes the DNG files on it s own?

I noticed this quite a while and it s annoying as hell when you have an automated backup process.

LR regularly DNG files... and LR changing again and again DNG files.

This means that files that are modified yesterday are perhaps changed again today.

I've noticed this with all versions of LR4.x and also LR5.

so I just create a catalog from TEST to test.

I Don t change anything on this catalogue of test images.

all I do is open the catalog and browse the files and allow the LR open and idle for some time.

and guess what... my DNG (and only the DNG files) files are constantly changed for no apparent reason.

to check what has changed in the DNG files I use exiftool and this is the result:

new file:

InstanceID xmp.iid:c0474916-c24c-2448-b42c-522076f5a25d

old file:

InstanceID xmp.iid:2e88ce2a-2e5a-b34d-a85b-2af2ab3494da

I also did a comparison hexagonal just now on these modified files:

http://i.imgur.com/FAaZz.jpg

Another example:

http://i.imgur.com/vzMbS.jpg

I have the function "automatically write changes to the XMP" lit.

but when I Don t change anything... There is nothing to write in the files... right?

Once again to do this 100% clear...

DNG files are in the LR catalog for months or years (not in the test catalog but my catalog of actual work).

DNG files are not affected by me (no changes are made in the LR modules, no new keywords or metadata changes etc.).

only what I posted above is changed in DNG files.

Does any other file formats (JPG, PSD, TIFF) in my catalog.

I don't use DNG files with any software then LR. I have not the same seen in another program.

PS: of course, I wrote about it in adobe... but as usual, nothing happens.

even with regard to my graphic problems... I send a sample file of adobe... they write in return that the mistake could be reproduced... and 5 point later the error is always in LR.

I do not use the DNG file format, but tried a test DNG file and could not resume this problem on my 64 bit Windows 7 using LR4.4.1 System. I checked the InstanceID by using EXIFToolGUI and he only changed when you do a CTRL + S save metadata in the file. Simply navigate the image in the library module or develop as well as other images in the same folder has NOT caused the InstanceID to change. I also did a search on 'DNG write metadata' in the Photoshop family forum and only found this post regarding the behavior of CTRL + S with DNG files:

http://feedback.Photoshop.com/photoshop_family/topics/only_write_metadata_if_out_of_date

If what you say is true, I believe there are many posts complaining about the issue. I have no doubt this problem, but logically it should happen only if somehow a CTRL + S or ' save metadata to File command is get called.

Maybe send a file and we can test it on our systems. Please provide some details on the procedures of LR you use that causes the InstanceID to change with this file. Do not assume that we understand what you are doing!

Tags: Photoshop Lightroom

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