When I do 'exiftool -a -u -G -H' the output contains tag details not only for the main (presumably IFD0) image, but also for an embedded thumbnail (presumably IFD1) image, if such exists within the JPEG file.
Is there a way I can suppress all the tags relating to the thumbnail? Because I'm parsing the output and using it for another purpose, the extra [EXIF] tags for the thumbnail really confuse things.,
Try adding --IFD1:all to the command.
Fantastic. Thankyou kindly.