INTRODUCTION TO CMY COLOR MODELS IN COMPUTER GRAPHICS

Color Models (CMY)

1. CMY COLOR MODELS

2. CMY Color Model The Color model defined with the primary color cyan, magenta and yellow ( CMY ) is useful for describing color output to hard copy devices. The Complements of red, green, and blue respectively. This System is used for primary for printing.

3. CMY Color Model The CMY Color are called the “Subtractive Primaries. Cyan, Magenta, and Yellow are the secondary color of light and the primary color of pigment. The White light is reflected from cyan-colored link. The Reflected light must have no red component.

4. CMY Color Model Diagram :

5. How the CMY model work Cyan (c): Absorb red light and reflects green and blue light producing a Cyan color.

6. How the CMY model work Magenta (M): Absorb green light and reflect red and blue light, producing a magenta color. Yellow (Y): Absorb blue light and reflect red and green light, producing a yellow color.

7. CMY Color Model When these three color are combined in different amount they can created a wide range of color . Cyan + Magenta Magenta + Yellow Cyan + Yellow Cyan + Magenta +Yellow

8. CMY Color Model Theoretically should produce black , but in practice, it produce a muddy brown. This is why the CMYK model ( Where K stands for black) is often used in printing to achieve a true black color. The CMY model is fundamental in color printing because it allow printer to create a full spectrum of color using just three primary color.

9. Printing Process The Printing process often used with CMY model a color point with a collection of four ink dots. Some what an RCB monitor uses a collection of three Phosphor dots. One dot is used for each of the primary color ( Cyan, Magenta and Yellow ) and one dot is black.

10. Printing Process A Black dot is include because the combination of Cyan, Magenta and Yellow ink typically produce dark gray instead of black. Some plotter produce different color combination by spraying the ink for the three primary color over each other and allowing them to mix before they dry .

11. CMY Color Model The CMY color model is primarily applied in the following area. Color Printing Photography Graphic Design

12. CMY Color Model Color printing : Inkjet Printers Offset Printers Inkjet printers : Most Inkjet printers are the CMY model, along with black ( CMY ) to reproduce image or text.

13. CMY Color Model By layering Cyan, Magenta and Yellow inks in varying proportions, a wide range of colors can be created. Offset Printing: In commercial printing such as for magazines, brouchures , and posters, the CMY model is used in a process called four printing.

14. CMY Color Model Photography : Color Film Photo Printers Color Film : Traditional photographic film uses layer sensitive to different colors often aligned with the CMY model.

15. CMY Color Model Photo Printers : High-end photo printers use CMY ( or CMYK ) to produce high-quality photographic prints with accurate color reproduction.

16. CMY Color Model Graphic Design: Design Software Design Software : Many graphic design software application use the CMY or CMYK color model when designing material for print .

17. CMY Color Model Designer choose specific Cyan, Magenta and Yellow value to achieve desired color in printed material . We can express the conversion from an RCB representation to a CMY representation with the matrix transformation.

18. CMY Color Model C 1 R M = 1 _ C Y 1 B Where the white represented in the RCB system as the unit column vector. Similarly, we convert from a CMY color representation to an RCB representation with the matrix transformation .

19. CMY Color Model R 1 C C = 1 _ M B 1 Y Where black is represented in the CMY system as the unit column vector .

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