A spatial gamut mapping technique is proposed to overcome the shortcomings encountered with standard pointwise gamut mapping algorithms by preserving spatially local luminance variations in the original image. It does so by first processing the image through a standard pointwise gamut-mapping
algorithm. The difference between the original image luminance
Raja Bala, Ricardo deQueiroz, Reiner Eschbach, Wencheng Wu, "Gamut Mapping to Preserve Spatial Luminance Variations" in Journal of Imaging Science and Technology, 2001, pp 436 - 443, https://doi.org/10.2352/J.ImagingSci.Technol.2001.45.5.art00004