Hi!
It seems like no information on the settings of image-based coloring is saved within the .bkd files.
I think this is important because it would greatly improves the usability.
The image location should be saved, along with the adjustments by the user (stretching and centering).
That way, you wouldn't have to readjust the image again after taking a break.
(I was lucky, because I used an image of a panda and could align one eye, then adjust the width so the second eye matched, and then took the nose as a reference for the height adjustments made.
However with more complicated images this might take a couple of minutes.)
lmnd