17. The computer program product of claim 16 , wherein computing the color transfer function further comprises collecting the sample colors from the region of interest determined for the cropped image and the region of interest determined for the indexed image.
18. The computer program product of claim 17 , wherein computing the color transfer function further comprises: applying the color transfer function to the cropped image to generate a transformed cropped image; applying the color transfer function to the indexed image to generate a transformed indexed image; computing a first distance measure between the cropped image and the transformed indexed image; and computing a second distance measure between the indexed image and the transformed cropped image.