Re: Adding metadata alters (reduces) image file size.

Posted by AlexC on May 18, 2020; 9:17pm
URL: http://digikam.185.s1.nabble.com/Adding-metadata-alters-reduces-image-file-size-tp4712412p4712512.html

Hi,
I have noticed the same after retagging my photos, and as I was worried there could be jpeg reencoding and therefore quality loss every time a tag is applied, I compared before and after photos: all pixels are the same as mentioned on the link of the previous post.
It might indeed be something like the thumbnails only are reencoded
Or maybe the xmp coding is more efficient (less characters for the same information)
I don't think jpegs would be reencoded in progressive, because it would show in pixel per pixel comparison no?
In my case the loss of size was less though, more like a few kB if I recall correctly