GamesRadar+ explains that scanlines can make retro games look more authentic by recreating the horizontal lines and softer image characteristics associated with CRT televisions. The effect matters because older consoles were designed for those displays, and modern flat-panel screens can make their graphics appear unusually sharp, harsh or uneven.

The article distinguishes basic scanline filters from more sophisticated CRT effects, which may also emulate screen curvature, phosphor glow, colour bleed and other display traits. It advises that the best approach depends on the console, game and display, as excessive effects can obscure the image rather than improve it.