@Andrius In terms of savings, it would depend on the raw file. One from my aging low end camera would have 1-2 MB in embedded images. Online, I found one with 6 MB. Multiply that by the thousands…
It is possible to delete embedded images with
exiftool -list FILENAME | grep Binary
exiftool -PreviewImage= -P *.EXTENSION
In Windows, use
find instead of
exiftool -list FILENAME | find "Binary"
find to discover the tag names of the embedded images.
-tag= to remove the tag or data. There may be multiple removals per raw.
- There is a restriction on
-ThumbnailImage; it cannot be removed.
- The default behavior of
exiftool is to append a suffix to the originals.
-P means “preserve file modification date/time”.
I agree that it is something that should not be done unless the user knows what he or she is doing. Some apps have specific uses for the embedded images and metadata attached to them.