1. Principles of Color Television

2. Three Basic Colors of Television Blue Red Green 11 % 30% 59 %

3. Three Color Characteristics Hue – adjusted color sometime called tint control (from green to red) Brightness – illumination of the picture that includes sharpness of edges including the contrast control Saturation -

4. Lights 430 Terahertz (430 X 10 Hz) to 750 Terahertz (750 X 10 Hz) 430 Terahertz is considered as a wavelength 750 Terahertz correspond to the color red and the higher frequency 400 nm seen deep blue Some colors do not correspond to any one given wavelength of light (example brown and purple) 12

5. Electromagnetic Spectrum

6. Color Mixing When sunlight passes through a glass prism will separate into multitude of color components. The display is called saturation

7. Subtractive color mixing Subtractive mixing – make use of filtering action that dyes pigments and inks. Ex: pictures, photographs, color movies. Additive mixing – superior to subtractive mixing. Using the primary colors as the base.

8. Spectrum of White light

9. Additive Mixing

10. Result of Additive Mixing

11. Result of 3 color additive mixing White Pale yellow Graypink Pale green Bluish Green 100% White 50% White 50 % Saturated red 50% Saturated Yellow

12. Luminance Level Dark yellow producing a shade of gray approaching black Y= 0.59G + 0.39R + 0.11B For equal Energy Y = 0.59(1) + 0.30(1) + 0.11(1) »=1.00 For 50 % red 100% blue 100% green Y = 0.59G + 0.30R + 0.11B »= 0.59(1) + 0.30(1) + 0.11(1) »= 0.59 + 0.15 + 0.11 »=0.85

13. Object size and color A 23 in television picture tube can show a video signal of 0.5 MHz or less correspond to horizontal picture tube object sizer ranging from 0.34 in or more. Object sizes ranging from 0.34 in to a minimum of 0.12 in corresponding to the half cycle of video frequency of 1.5 MHz. Only two colors orange and cyan can provide complete color reprodution

14. continuation Luminance signal information has required bandpass from 0 to 4.2 MHZ The narrower the bandwidth of the color information the less complex the color tv system need be.

15. Color Television Transmission

16. Matrix Y Color Transmitter

17. G-Y Matrix (R –Y) + Y = R (B – Y) +Y = B (G – Y) + Y = G

18. Y color Receiver

19. Balance Modulator

20. Color Burst color synchronizing

21. Phase relationship The amplitude of the composite chrominance signal represents the color Saturation information and its phase corresponds to the actual color of hue information of the picture being transmitted Phasor – a sine and cosine waves can be represented by a straight line.

22. Three phasors properties Length Speed of counter clockwise rotation Relative angular position

23. Performance of the chrominance signal Y =0.59G + 0.30R + 0.11B =0.599(0) +0.30(0) + 0.11(0) = 0.41 R –Y = 0.70R – 0.11B– 0.59G =0.70(1) – 0.11(1) – 0.59(1) = 0.59 B – Y 0.89B – 0.30R – 0.59G =0.89(1) – 0.30(1) – 0.59(0) = 0.59

24. COLOR PHASE ANGLE

26. Misconvergence

28. Low green adjustment

29. High adjustment of blue

30. Dominant Red missing green

31. Dominant Blue Missing Green

32. Missing Red

33. Too much Blue adjustment

34. Low red adjustment

35. Low green and blue adjustment

36. Low red and green color adjustment