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Huh, a question I can't answer... No, I have pretty much no idea how VX works or the size or texture sections of imported pictures. Sorry.
Looks to me like it would be a center tile, as in the tile that would show if no edges were present.
I'm not sure. Why don't you try importing a random image that is not formatted to 256 colors and see if that works first.My guess is that there is not color limit, but I'm not positive.