To simplify the work of animating my cartoon about a mouse, a plug-in for the GIMP raster editor has been written to allow the direct exporting of multi-layered images to corresponding layers of the 2D animation package Synfig.
The plug-in registers itself in the GIMP image menu <image>-> File-> Export-> Synfig.
There are export options you can choose. If the field "output path" is empty, the synfig canvas will be kept in the same directory as the initial GIMP document.
Here is the result:
On the left you can see the initial image in Gimp, and on the right the same image imported into Synfig.
After adding a scale layer, the images cannot be distinguished.
For it to work, GIMP must support Python, and the most recent version of Python must be fully installed.
To install it, simply place the file in ~/.gimp-*/plug-ins/ and make it executable (chmod +x synfigexport.py), then restart The GIMP.
This program is licensed under Creative Commons Attribution 3.0 Unported License. Distribution and updating of the code is welcomed.