<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>I might be wrong but I think BQM always produces a new file and the operation is not lossless.</div><div><br></div><div>You might want to use exiftool / exiv2 to shift date/time of multiple pictures.</div><div><br></div><div>Here is an example from exiftool website:</div><div><br></div><div>Common metadata date/time tags are incremented by -6 hours, while<br>FileModifyDate is not changed:<br><br>exiftool -alldates-=6 -P FILE(FOLDER)</div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Samsung Galaxy smartphone.</div></div><div><br></div><div style="font-size:100%;color:#000000"><!-- originalMessage --><div>-------- Original message --------</div><div>From: woenx <marcpalaus@hotmail.com> </div><div>Date: 2018-03-07 7:30 AM (GMT-07:00) </div><div>To: digikam-users@kde.org </div><div>Subject: [digiKam-users] Is changing the date of a photo a destructive process? </div><div><br></div></div>So I want to correct the date to a bunch of pictures. If use the metadata<br>editor on the tools panel, I can just change it one by one. If I want to<br>process several at a time, I use the Batch Queue Manager.<br><br>By default, the Batch Queue Manager does not overwrite pictures, you have to<br>actively check that option, and there's also a whole "Saving images" tab<br>dealing with JPG quality and that kind of stuff. <br><br>My question is: If I am just changing the date of a group of JPG pictures,<br>do they lose quality every time a change is made, or the batch queue manager<br>just changes the metadata and leaves the picture intact? <br><br><br><br>--<br>Sent from: http://digikam.1695700.n4.nabble.com/digikam-users-f1735189.html<br></body></html>