A sharpness control often emphasises edges rather than recovering missing source detail. Too much can create bright outlines, ringing or unstable texture. Start from a restrained setting and compare faces, text and fine lines in motion instead of judging only a paused logo.
Understand the apparent improvement
An enhanced edge can look crisper at first because the difference between neighbouring tones is exaggerated. That is not the same as resolving more real texture. Strong processing can make skin look artificial and turn small lettering into thick outlines, especially when the source already contains compression artefacts.
Use a repeatable scene
Choose a close-up, a fence or a scoreboard with small text. Reduce sharpness gradually and watch whether halos disappear while genuine detail remains. Menu labels and neutral values differ between televisions, so do not assume that zero or the midpoint has the same meaning on every model.
Separate scaling from enhancement
A low-resolution picture still needs scaling to fill the panel. Disabling excessive edge enhancement does not stop that necessary step. If the source remains soft, compare a better-quality programme before adding processing back. Record a useful baseline for each input because a built-in app and an external box may remember different picture settings.
