This document introduces color models and discusses RGB and CMY color models. It provides an overview of the primary colors and color mixing properties of each model. RGB is an additive model that uses red, green, and blue light to create colors and is used for displays. CMY is a subtractive model that uses cyan, magenta, and yellow inks to create colors by absorbing light and is used for printing. Each model has different applications and advantages for displays versus printed materials.

1. Welcome
everyone

3. Name ID
Md.Delwar Hossain 131-15-2352
Md.Naimur Rahman 131-15-2375
Prodip Sarker 131-15-2416
Md. Al Jobaed 131-15-2540
Fatema Tuz Zohora 131-15-2417

4. Contents……
 Color
 Color Model
 RGB Representation
 CMY Representation
 Properties of RGB Model
 Properties of CMY Model
 Applications
 RGB Vs CMY

5.  Color is a sensation produced by the human eye
and nervous system.
What is Color ?

6. Color Models
Color model is an orderly system for creating
a whole ranges of color from a small set of
primary color.
A color model is also a way to turn colors
into numbers with a mathematical formula.

7. Color Models

8. Types of Color model

9. Additive Color Model……..
Additive color is color created by mixing a number of
different light colors, with shades of red, green, and blue.
Example of additive color model is RGB Model
RGB model contains primary colors.
primary colors are:
 Red
 Green
 Blue

10. Subtractive Color Model……..
A subtractive color model explains the mixing of a limited set
of paint pigments to create a wider range of colors.
Example of subtractive color model is CMY Model.
CMY model contain secondary color.
Secondary colors are:
 Red + Blue =Magenta
 Green +Blue = Cyan
 Red + Green = Yellow

11. RGB Color Model……..

12. Properties of RGB Color System……
* Additive color model.
* For computer displays.
* Uses light to display color.
* Colors result from transmitted light.
* Red + Green + Blue = White.

13. RGB Representation……
 We can imagine the RGB as a 3-dimensions .
 RGB is our Goal from
 Now to the end.
 Actually RGB is three
 layers behind each
 other but just for
 imagining .

14.  The RGB Color Model
 If R,G, and B are represented with 8 bits (24-bit RGB
 image), the total number of colors is (28 )3=16,777,216
RGB Color Model……..

15. Numeric Representations
Notation RGB triplet
Arithmetic (1.0, 0.0, 0.0)
Percentage (100%, 0%, 0%)
Integer number (255, 0, 0)

18. Numeric Description……….
 A typical RGB color ranges from 0 to 255.
 A color in the RGB color model is described by indicating how
much of each of the red, green, and blue is included.
 The color is expressed as an RGB triplet (r,g,b), each component of
which can vary from zero to a defined maximum value. If all the
components are at zero the result is black; if all are at maximum,
the result is the brightest representable white.

19. Physiological Functions of RGB…………….
 Within the human eye are two elements which are responsible for
the perception of light: rods and cones.
 The rods contain the elements that are sensitive to light intensities.
They are used almost exclusively at night for humans night vision.
 The cones provide humans with vision during the daylight and
are separated into three types, where each type is more sensitive to a
particular wavelength

20. Importance of rgb color model……
 The color model RGB is used in hardware
applications like PC monitors, cameras and
scanners,
 It is used for Web graphics, but it cannot be used
for print production.
 It directly reflects the physical properties of
"True-color" displays

21. Applications of rgb color model……
 It is used—
For sensory representation
Display of text images in electronic system,
 For example-Computer, T.V., Camera

22.  Pros:
 Cartesian coordinate system
 linear
 hardware-based
 Cons:
 hard to use to pick and name colors
 Highly redundant
 non-uniform
Pros & cones of rgb color model……

24. Properties of Cmy(K) COLOR model…….
* Subtractive color model.
* For printed material.
* Uses ink to display color.
* Colors result from reflected light.
* Cyan + Magenta + Yellow = Black.

25. CMY(K) Model…….
•Unit Cube defined on C, M & Y axes.
•A printed color that looks red absorbs the
other two components G and B and
reflects R.
•Thus the C-M-Y coordinates are just the
complements of the R-G-B coordinates.

26. In additive color models such as RGB,
white is the “additive” combination of
all primary colored lights, while black
is the absence of light.
In the CMYK model, it is the opposite:
white is the natural color of the paper
or other background, while black
results from a full combination of
colored inks.
RGB To CMY CMY To RGB
CMY(K) Model…….

29. Importance of cmy color model…….
 the CMY color model is used in color
printers.
 It is created by the subtractive mode
 Used in most commercial color printing
(books, magazines, etc.)

30. Applications of CMY color model…….
 Used for hardcopy devices
 Used to describe the printing process
 Used in color printing

31. Pros & Cons of CMY color model…….
Pros:
Each color can be matched using exactly one
CMY combination.
Cons:
unwanted stimulations
printing black text or line art using CMY
unwanted absorptions
poor color constancy

32. Rgb vs. cmy model…….
RGB is based on projecting but CMY is based on ink.
RGB is used for projecting light but CMY is used for
reflecting light
RGB offers a much wider range of colors than CMY
RGB scheme can produce colors that are more vivid
and vibrant.

33. Some examples of 24-bit representation of colors:
 (255, 255, 255) represents white
 (0, 0, 0) represents black
 (255, 0, 0) represents red
 (0, 0, 255) represents blue
 (0, 255, 0) represents green
 (255, 255, 0) represents yellow
 (255, 0, 255) represents magenta
 (0, 255, 255) represents cyan

34. HSV:

35. Continue:

37. References:
 https://en.wikibooks.org/
 https://en.wikipedia.org/wiki/RGB_color_model
 http://www.colormatters.com/
 http://www.slideshare.net/
 http://thevisualcommunicationguy.com
 http://www.graphpad.com/support/faqid/1282/

38. Any Question
???