NTSC

A television video format used in the United States and elsewhere. Displayed 525 lines of resolution at 60 fields per second, 30 frames per second (actually a fractional value near 29.97). Named for the National Television Standards Committee. 

Developed by RCA and NBC companies, many different versions of the format were developed later on. The NTSC system was later revamped in 1950 to determine the colors to be used in the USA. This color system sends the information of all three prime colors (red, green and blue) together.

The use of parts related to red, green and blue colors ensures that when another color is required, these primary colors are mixed in the required ratio.

In this system, color information is sent as a difference signal (I and Q) between two colors. Color signals superimposed on the black and white signal are used to modulate the high frequency secondary color carrier. In the NTSC system, the hue of the color is determined by the phase of the color carrier.

In this case, an error that may occur in the phase causes the color to change. The phase that determines the color is determined according to the color synchronization signal sent during erasing.

This mark is always kept at a certain level. The color mark is sent at varying levels according to the brightness of the color. Thus, the phase of the color mark can vary from the encoder in the transmitter to the decoder in the receiver. Reflections during transmission can also cause this change.

As a result, the color of the image obtained on the receiver will differ from the original, and NTSC receivers require color adjustment with a color slider.