You could do something like:
sz = size(bg_img)
x, y = LinRange(-1, 2, sz[1]), LinRange(-3, 4, sz[2])
plot(x, y, bg_img)
You could do something like:
sz = size(bg_img)
x, y = LinRange(-1, 2, sz[1]), LinRange(-3, 4, sz[2])
plot(x, y, bg_img)