How and to what extent the increase of Cab * affects on various subjective evaluations for congenital red-green color deficiency (CVD) and normal color vision (NCV) observers was investigated using scenery, food, and graph images. Results of "Pale vs Deep" evaluation indicate similar tendency for all color vision types in all test images, indicating that CVDs recognize the saturation change of images similar to NCVs using some kind of strategy. Individual differences of the CVDs in the results of other adjective pairs such as "Unnatural vs Natural" are generally larger than those of NCVs. Some color combinations in the graph images are indiscriminable for either protan or deutan, and thus are not recommended to be used.
Miyoshi Ayama, Minoru Ohkoba, Kahori Tanaka, Tomoharu Ishikawa, "Color image evaluation of congenital red-green color deficient and normal color vision observers" in Proc. IS&T London Imaging Meeting 2020: Future Colour Imaging, 2020, pp 15 - 18, https://doi.org/10.2352/issn.2694-118X.2020.LIM-30