How to show image as map in mapbox and use custom scale for it -

How to show image as map in mapbox and use custom scale for it -

i trying utilize image map in mapbox. have upload image of floor. shown floor map own custom scale.

for showing image have used next code:

var map = l.mapbox.map('map', '',) .fitbounds(imagebounds); l.imageoverlay(imageurl, imagebounds).addto(map);

it showing image want alter scale. how can l.control.scale api not provide alter measurements ?

map mapbox