For the imported images (inside the nodes) the image is drawn with the background colour. It would be desirable to draw the image with a transparent background in order to create beautiful graphs.
I've applied a little algorithm to recognize the first pixel of the image as the transparent colour. You can see it in the last released version v1.1
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I've applied a little algorithm to recognize the first pixel of the image as the transparent colour. You can see it in the last released version v1.1