1. A method of transforming a stereoscopic image, comprising: extracting a depth map from red, green, and blue (RGB) images of a left-eye image and a right-eye image of the stereoscopic image as the left-eye image and the right-eye image are input; obtaining transformation information from the depth map; and transforming RGB values of the RGB images of a left-eye image and a right-eye image of the stereoscopic image using a contrast transformation scheme or a background darkening scheme, wherein the method is performed using one or more processors.