Textures.com offers leaf textures in a multiple-leaf-per file format. There are also six files for all the maps.
Is the expectation that I open these in gimp and make them into separate images (somehow keeping the edits identical across all six images/maps), or is there a way to use a file like this directly in Blender where you draw bounds around the individual leaves and it assigns one of the groups randomly to each leaf instance? This is for a sapling generated tree in 2.81a.