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Welcome everyone
Presentation On
RGB &CMY Color Model
Presented By……..Name ID
Md.Delwar Hossain 131-15-2352Md.Naimur Rahman 131-15-2375Prodip Sarker 131-15-2416Md. Al Jobaed 131-15-2540Fatema Tuz Zohora 131-15-2417
Contents……
Color Color Model RGB Representation CMY Representation Properties of RGB Model Properties of CMY Model Applications RGB Vs CMY
Color is a sensation produced by the human eye and nervous system.
What is Color ?
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.
Color Models
Types of Color model
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
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
RGB Color Model……..
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.
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 .
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……..
Numeric Representations
Notation RGB triplet
Arithmetic (1.0, 0.0, 0.0)
Percentage (100%, 0%, 0%)
Integer number (255, 0, 0)
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.
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
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
Applications of rgb color model……
It is used—For sensory representationDisplay of text images in electronic
system,For example-Computer, T.V., Camera
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……
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.
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.
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…….
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.)
Applications of CMY color model…….
Used for hardcopy devices
Used to describe the printing process
Used in color printing
Pros & Cons of CMY color model…….
Pros:Each color can be matched using exactly oneCMY combination.
Cons:unwanted stimulationsprinting black text or line art using CMYunwanted absorptionspoor color constancy
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.
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
HSV:
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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/
Any Question ???