I have printed my edible images for a wedding cake. It is dark colored and perfect. Now what are the secrets of getting it off the backing.
The old ones you needed to put into the freezer for 15 seconds. For me the newer ones have peeled off nicely from the backing without putting it into the freezer.
As the other CCer said, just leave the frosting sheet in the freezer for a few minutes. When you take it out the picture will peel away from the backing easily.
Just remember to precut any shape before putting in freezer (if you have to). Because if you try to cut the cold frosting sheet some pieces will break. In case if you forget to precut, let the frosting sheet come to room temp. cut your shape and refreeze it again.