1. A processor-implemented system for determining coating thicknesses, the system comprising: one or more processors configured to: acquire original image data from a coating material applied to a substrate surface; enhance a color differentiation in the original image data to generate enhanced image data; acquire spectral response data associated with one or more light sources based at least in part on the enhanced image data; acquire coating thickness data of the coating material; and determine an interrelationship between the spectral response data associated with the one or more light sources and the coating thickness data of the coating material; one or more non-transitory machine-readable storage media for storing the original image data, the enhanced image data, the spectral response data, the coating thickness data, and a data structure for the interrelationship between the spectral response data associated with the one or more light sources and the coating thickness data of the coating material.