Hum... I only used digikam and darktable...
Maybe they came with the caption already there from the phone (Samsung Android).
I will try to figure out where it came from.
Exiftool showed that the comment was written to the whole bunch of different metadata fields but simple emptying of the Caption field on the right panel in digikam deleted them all. :-)
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
Date: 2017-09-12 3:08 PM (GMT-07:00)
To: digiKam - Home Manage your photographs as a professional with the power of open source <
[hidden email]>
Subject: Re: processed by AtomJPEG 1.5.0n
No. It's a closed source JPEG codec :
probably the images have been processed outside Linux (:=)))....
Gilles Caulier