so that Synfig renders the tweening of these images by itself...
...So that Synfig renders the tweening of those two blines values
Synfig tweens vector values (bline definitions) and achieve raster images from it (image output) but cannot tween images based on any bline movement rules.
In Synfig you can distort images but not in a tweening way between two different images.
You can twirl, spherize, warp, curve warp, rotate, scale, translate, noise distort, inside out, etc. one image
but not tween between two of them
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