/vr/ - Retro Games

>>3028556
Y is luminance, or how bright the signal; is at any given moment of the horizontal scan.

Pb and Pr are explained in pic related. This is the colour space for this signal. Cb and Cr are digital versions of same.

>>2760750
Composite video encodes a color video signal over a single wire. The video signal consists of a monochrome signal with a slightly varying phase to indicate coloration. It was developed to maintain compatibility with black and white TV's when color was being introduced in consumer televisions.

RGB is another method. because Red/Green/Blue are the primary colors of light that all other visible colors can be made with. Some sets allow you to input red/green/blue signals directly to the tube, which contains three electron guns: a red gun, a green gun, and a blue gun. Those aim at corresponding phosphors on the face of the tube that light in red, green, and blue. These combine when viewed at a distance to form other colors. RGB usually consists of 3 wires for the 3 colors, plus one or two sync lines. Some combine horizontal and vertical sync (for TV's, horizontal is 15.734 kHz in NTSC, 15.625 in PAL, vertical is 60hz in NTSC, 50hz in PAL) into 'cSync' - this is what most game consoles do (such as the SNES). It is typically referred to as Hsync and Vsync when split, as in VGA, which uses RGB.

Component video has a few meanings but usually is equated to 'ypbpr' - where you have a luminance signal (black and white image) Y, a Pb signal (same as Cb in pic), and a Pr signal (same as Cr). All three are on different wires. Y also contains the 'sync' information that tells a CRT where to position the electron guns that paint an image on the face of a tube. Y is essentially composite video without any color. Pb and Pr together act to refer to points on the CbCr color space (see picture). Analog voltages are used to pinpoint a color to be displayed on the screen, on top of the monochrome Y image. As the guns draw Y, a circuit in the TV checks Pb and Pr to determine what color should be given to the monochrome signal, and the Y, Pb, and Pr are converted to the RGB color space so they can be displayed.

Don't feel bad if you have trouble understanding, I did too.