How is C2 managing tilemap images?

Hi,

i would like to know, how C2 is organizing the images for the integrated tilemap plugin.

Because, if i use one image for different tilemaps in different levels, and later i see that i must

resize the image to add some more tiles in a level, do i have to reload the image for every other tilemap?

I want to know, if C2 makes its own atlas of the tilemap image. If i change the image and

don't reload it for every tilemap object, do i end up with an amount of separate images?