After all, who wants a picture that's dim, colorless and dull, right? In reality, maxing out any of those adjustments can ruin your picture, making it less accurate and limiting the potential of the best TVs. Turning them all up might seem like a great idea. Sharpness is one of the many picture settings on your TV, like brightness, contrast, and color. Sometimes the best setting is actually 0, while on most TVs the setting is best in the bottom 20% or so. That means when your sharpness is set too high, you could lose some of the crisp detail of that fancy 4K TV.
(If you want better TV, take a look at the best picture mode and try changing these settings.) Instead, sharpness control adds something called 'edge enhancement,' which can diminish the fine resolution in the image you're looking at. Despite the name, the sharpness control on your TV doesn't actually 'increase' the sharpness, detail or anything else associated with a good picture.
