ACBF Viewer 2.00 is out

Written for Advanced Comic Book Format by Robert Kubík (Pastierovič) on 2018-11-04

ACBF Viewer 2.00 is out. Changes are:
- code has been ported to Python 3 and GTK 3 (PyGObject)
- frame animation has been added (animations including fade in/out effect can be turned on/off in preferences)
- installer for Windows is now created
- next image is loaded during fade out animation, which improves loading speed
- several minor fixes