How to remove Samsung makernotes data, without removing all metadata

[LaurentG]

Hi,

I have a photo that contains VERY large metadata from Samsung

Code Select Expand

[MakerNotes:Samsung] DepthMapWidth              : 1024
[MakerNotes:Samsung] DepthMapHeight             : 576
[MakerNotes:Samsung] EmbeddedImageName          : DualShot_1
[MakerNotes:Samsung] EmbeddedImage              : (Binary data 3434120 bytes, use -b option to extract)
[MakerNotes:Samsung] DepthMapName               : DualShot_DepthMap_1
[MakerNotes:Samsung] DepthMapData               : (Binary data 589824 bytes, use -b option to extract)
[MakerNotes:Samsung] TimeStamp                  : 2024:11:19 15:11:57.373+01:00
[MakerNotes:Samsung] MCCData                    : Italy (222)
More than 4 Mb for EmbeddedImage + DepthMapData !
After removing all metadata, the image itself is "only" 2.8 Mb !....

I don't know how (and where) these data came, it's the ONLY photo taken with my samsung S23 that includes such data....
And clearly, they are (at least for me) 100% useless !

I tried to remove them with exiftool image.jpg -makernotes=, or -makernotes:all=  but it does not remove anything
I tried also with -samsung:all=   but the answer is "not a deletable group, nothing to do"
I tried also to remove "only" large tags, -EmbeddedImage=  , but the answer is "Sorry, embeddedimage is not writable. Nothing to do".

The only way I've found is to remove all metadata : exiftool image.jpg -all=
But I do not want to remove all ! I'd like to keep all of them, except the one, useless, that are very large. Ideally, I would like to remove not all the samsung group, but keep Timestamp and MCCData and remove the others....

How can I do that ?

[ywzc]

I suspect that the solution would be to delete the trailer Trailer:All=. Many embedded thumbnails referenced in MakerNotes are stored in the trailer of the image.

Also, check out the Samsung Tags page for more details, maybe you will find something useful.

[LaurentG]

Thank you, it worked "almost" fine.
Why "almost" : because with -trailer:all=  it actually deletes all the samsung group, ie. deletes also MCCData and TimeStamp I'd like to keep, but it's a minor drawback vs do nothing.

I apply in a first time... and I hope that Phil a/o StarGeek may have an "even better" solution ?

[LaurentG]

I have had a look to this "EmbeddedImage" with more than 3 Mb....

Actually, it's a JPG image of the same resolution than the "main" image, that has its own Exif and other metadata.
But on the other hand, do not include "level 2 embedded" images in it (not even Exif thumbnail). It's not a russian doll
Actually, the only missing data are the Exif Thumbnail (and other data from [IFD1] group, resolution, compression, width and height), the FlashpixVersion tag, and the Samsung MakerNotes.
According to some of these timestamp data, it has been taken 1/1000 second after the "main" image.

The best, in this story, is that this "embedded" image is even slightly better than the "main" image. Eventually, I kept this one rather than the original "main" image.
I still don't know what I did to have this behavior when taking this photo. It never occurred before (I have my S23 almost 1 year ago), and never since this one....
And I do not really understand the purpose of such a behavior....

[StarGeek]

I apply in a first time... and I hope that Phil a/o StarGeek may have an "even better" solution ?

From a previous post by Phil, emphisis mine

Sorry, but the TimeStamp is stored in the Samsung trailer, which is not currently writable.

If you check the the trailer section under Supported JPEG Meta Information, you will see that the Samsung trailer is still not writable.