Color model is a standard way to specify a particular color, by defining a 3D coordinate system, and a subspace which contains all colors that can be formed into a specific model. A color can be specified using a model will relate to a single point in space sautu section defines. Each color is directed to one particular standard hardware (RGB, CMY, YIQ), or image processing applications (HSI).
RGB Color Model
An image in RGB model consists of three areas of the image are independent of each other, each consisting of primary colors: red, green and blue. A color is specified as a mixture of a number of primary color components. The figure below shows the geometry of the RGB color model to specify color using the Cartesian coordinate system. Greyscale spectrum (gray level) is the color that is formed from the combination of three primary colors by the same amount, are on the line connecting black and white dots.
RGB Color Coordinates images
Colors presented in an additional beam to form a new color, and interconnected to form a mixture of light. Image in the image below left shows the mixture by adding primary colors red, green, and blue to form secondary colors yellow (red + green), cyan (blue + green), magenta (red + blue) and white (red + green + blue ). RGB color model used for computer monitors and video cameras.
Model CMY Color
Model CMY (Cyan, Magenta and Yellow) is a substractive models associated with the absorption of color, for example pigment paint color (as shown above right). A cyan painted surfaces then illuminated white light, then there is no red light is reflected, and Similar to the color magenta to green, and yellow with blue. Relationships CMY models are as follows:
Color Model HSI
As already described, the color can also be specified by three quantization hue, saturation, intensity (called the model HSI) as shown diabawah. In the picture to the left is a solid form of HSI and the right is the HSI triangle model which is a flat field of solid models HSI cuts horizontally at a certain level of intensity. Hue is determined from the red color, saturation is determined based on the distance from the axis. Colors on the surface of the solid model created from full saturation, ie pure color and gray level spectrum,
Value conversion between RGB and HSI models are as follows:
wherein the quantity of R, G, and B is the number of color components of red, green, blue and dinormilisasi to [0.1]. Intensity is the average value of the components red, green and blue. Saturation value is determined as:
RGB Color filters
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