Changes

Shaders and filters can be applied to video games to achieve some kind of visual effect. These can be from attempting to replicate [[Recommended Displays|aperture grille]] displays, NTSC cablessignals, or something more exotic.

These Most of these replicate aperture grille CRTs, which have sharp images and strong scanlines. They do not Only a few replicate shadowmask CRT displaysshadow mask CRTs, often requiring much higher resolutions. 

These replicate the cables used to connect the system signals that consoles output to the TV. They vary in quality, with the lowest being RF, then composite, then s-video and RGB (scart) being the highest quality. Many systems emulators have NTSC filters built into them. They can also be separately downloaded in .filter plugin format.