| OK these options are very complex and require a bit of knowledge on how a Cathode Ray Tube (CRT) TV works. In the simplest terms, a beam of photons is fired at a phosphorescent screen behind a mesh of red,green and blue colours. Say that the signal wanted a red colour, the beam would miss the green and blue colours and only hit the red one. Using a combination of colours and power, the beam can create almost any colour. The beam travels across the screen hitting the colours it needs. This is called a scanline. To generate a whole screen the beam first travels down every other scanline and then as it switches off those lines it draws the lines in between. This is called interlacing and can happen at different hertz (normally 50hz or 60hz). Interlaced screens were the norm for many years until progressive screens came in. These ran at twice the speed but drew each line in one pass. This gave a more detailed picture and most modern tv's are now progressive scan. What HLSL does is simulate how a CRT TV looks when displaying a game or system through the use of 3D shaders. This is a very efficient way of adding effects as it uses little CPU time as the hard work is done by your graphics card. |