This bug was fixed in the package gnome-photos - 3.24.2-0ubuntu1
--------------- gnome-photos (3.24.2-0ubuntu1) artful; urgency=medium
* New upstream release (LP: #1690500) - Fixes transparency in PNG files
-- Tim Lunn <email address hidden> Sat, 13 May 2017 14:38:07 +1000
This bug was fixed in the package gnome-photos - 3.24.2-0ubuntu1
---------------
gnome-photos (3.24.2-0ubuntu1) artful; urgency=medium
* New upstream release (LP: #1690500)
- Fixes transparency in PNG files
-- Tim Lunn <email address hidden> Sat, 13 May 2017 14:38:07 +1000