There is no standard for "skin tone." The color of human skin varies from one person to the next and even on the same person. Emotional states affect the color of the complexion. So do physical exercise, general state of health, diet, sun exposure, wind exposure, external temperature, etc., etc.
How human complexion appears in video programs is a constantly moving target. Variables include the above, and also technical issues, such as: set lighting, wardrobe, makeup, scene changes, reflections from nearby colored surfaces, final tweaks in mastering by the colorist, etc., etc.
The control on Samsung's TVs is not a universally used feature across the industry. This control should be adjusted for least effect possible, ideally zero, and left there. The color performance of any video display should simply be aligned with general video standards. That is the only way to insure the faithful reproduction of a program. Fiddling with color controls by eye to achieve a more individually "pleasing" result is simply guessing and personal preference. Individual viewer preference has no common place in display calibration discussions. We calibrate to standards, not every audience member's whim, fancy, mood, or notion. The fundamental principles of imaging science are universally based upon human visual perception, physics, and electrical theory. Forum members frequently go astray in their presumptions about video and display devices due to an insufficient understanding of these fundamentals. Forming a logical construction, launched from a faulty premise, inevitably ends in unnecessary complexity, confusion, and failure.
Best regards and beautiful pictures,
G. Alan Brown, President
A Lion AV Consultants affiliate
"Advancing the art and science of electronic imaging"