rgb & cmy(k) color model

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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 ???