Please run with QT_DEVICE_PIXEL_RATIO=2 and fix See fixes in ksnapshot repo
Changed assignee to David Edmundson, who's working on a fix. Track on the ReviewBoard at: https://git.reviewboard.kde.org/r/124770/
Hello! Sorry to be the bearer of bad news, but this project has been unmaintained for many years and I will be closing this bug. Spectacle is the replacement for ksnapshot now. Please test again and file a new bug for Spectacle if you still have issues. Thank you!