Set compression to 50 is the format is png
This reverts commit 0f259d9be2bd6be8e8e28b46f22e5ba7d5720273.
If no value for compression is set the png handler will fallback to using quality to determine compression resulting in huge files. See also the Discussion in D19591.
Save png with quality configured to 100.
The picture file should have a reasonable size.
Reviewers: Spectacle, cfeck, ngraham
Reviewed By: Spectacle, ngraham
Subscribers: shubham, Spectacle
Differential Revision: https://phabricator.kde.org/D20985