I want to know how to add scale bar to a histopathological image using ImageJ whose image scale was not recorded at the time of taking the image.I got to know from the technicians that 1micron is equal to 0.0465 pixel for the microscope and images were taken using 40X magnification. At the top left corner of ImageJ software I am getting a value 4.64 X 4.61 (1392 X 1040).Kindly help urgently.