1. A non-transitory computer-readable storage medium including instructions that, when executed by a processor, cause the processor to perform the steps of: downsampling first color space values to generate downsampled color space values; upsampling the downsampled color space values to generate second color space values; and modifying at least one component value included in the downsampled color space values based on a first component value included in the first color space values, a second component value included in the second color space values, and an approximation of a nonlinear transfer function.