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  Colour Television

Introduction to Colour Television

It is extremely pleasant when thinking about color television. Since, it depicts the real and precise colors of the picture. Before you have studied about the monochrome TV receiver. After that let we introduce the fundamentals of color television to you.

The picture tube is the basic variation between monochrome and color televisions. There are three electron guns in color television picture tube. However, lots of colors, all the other colors are generated. On the base of three colors, three electron guns are employed.

Magenta, Cyan and yellow are corresponding colors.

MIXING OF COLORS

Mixing of colors is carried out in two methods.

1) Additive mixing

2) Subtractive mixing

ADDITIVE MIXING

30% Red + 59% Green

=

Yellow (89%)

30% Red + 11% Blue

=

Magenta (41%)

11% Blue + 59% Green

=

Cyan (70%)

30% R + 59% G + 11% B

=

White (100%)

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SUBTRACTIVE MIXING

White - Blue - Green   =          Red

White - Green            =          Magenta

White - Green - Red   =          Blue

 White - Blue             =          Yellow

White - Blue - Red     =          Green

White - Red              =          Cyan

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Color matrix and color burst circuits are employed for the mixing of colors.

Germany, America, and France use dissimilar methods in developing an image. They are

a. American method - NTSC (National Television Systems Committee)

b. Germany method - PAL (Phase Alternation by Line)

c. French method - SECAM, (Sequential Color and Memory In Our country, PAL - B method is employed.

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