So I have been using an internet search engine and I found this VERY interesting article about how controls like Contrast, Brightness, Tint and Sharpness shouldn't even be there in the first place on modern HDTVs.
They are a thing of the past according to the author:
Controls of a Bygone Era
Even more shocking, today’s digital monitors and HDTVs still have the same basic user controls that were found in the original analog NTSC color TVs from 1953: brightness, contrast, tint, and sharpness. These controls only made sense for analog signals on the old NTSC television system. Brightness controlled the CRT direct-current bias, contrast controlled the video amplifier gain, tint controlled the phase of the color subcarrier, and sharpness performed analog high-frequency peaking to compensate for the limited video bandwidth of the old vacuum tube amplifiers. Today, none of these controls are necessary for digital signals.
Brightness and contrast controls shouldn’t be there because, for digital video, the black level is fixed at level 16, reference white at 235, and peak white at 255. Similarly, tint and phase have no real meaning for digital signals. Finally, the sharpness control isn’t appropriate for digital displays because in a digital image there’s no transmission degradation—the image is received exactly as it appeared at the source. Sharpening the image involves digitally processing the pixels, which leads to artifacts and noise unless it’s done at resolutions much higher than the final displayed resolution, which, of course, isn’t the case inside your monitor or HDTV.
Controls that Do Worse Than Nothing
Most monitor and HDTV user-menu options are actually unnecessary features added for marketing purposes—gimmicks to suggest the display has unique features that other models lack. Even worse, most of these options actually decrease image and picture quality.
In many cases, it’s not even clear what these sham controls really do. The documentation seldom explains them, and I even know engineers from high-level manufacturers who don’t know what the controls do, either. When I test TVs, I spend an inordinate amount of time using test patterns to figure out what the options and selections really do, and in most cases, turning off the fancy options leads to the best picture quality and accuracy.
The following is a list of useless (or near-useless) menu options and selections from three HDTVs sold by major brands: Black Corrector, Advanced CE, Clear White, Color Space, Live Color, DRC Mode, DRC Palette, Dynamic Contrast, xvYCC, Color Matrix, RGB Dynamic Range, Black Level, Gamma, White Balance, HDMI Black Level, Fresh Contrast, Fresh Color, Flesh Tone, Eye Care, Digital NR, DNIe, Detail Enhancer, Edge Enhancer, Real Cinema, Cine Motion, Film Mode, Blue Only Mode.
Some of the terms sound impressive, but almost all of this is unnecessary puffery and jargon that confuses not only consumers but the pros, as well.
Anything below 50 starts a softening, blurring process that makes the image quality suffer.