Hue and saturation, Computer Graphics

Assignment Help:

Hue and Saturation: A light source produced by a sun or electric bulb emits all frequencies within the visible range to give white light. When this light is incident upon an object, some frequencies are absorbed and some are reflected by the object. The combination of reflected frequencies decide the color of the object. If the lower frequencies are predominant in the reflected frequencies, the object color is red. In this case, we can say that the perceived light has a dominant frequency at the red end of the spectrum, therefore, the dominant frequency decides the color of the object. Due to this reason dominant frequency is also called hue or simply the color. Apart from the frequency there are two more properties which describe various characteristics of light. These are brightness and saturation (purity). The saturation describes the purity of the color. Conversion Between HSV And RGB Models It HSV color parameters are made available to a user of a graphics package, these parameter are transformed to the RGB settings needed for the color monitor. To determine the operations needed in this transformation, we first consider how the HSV hex cone can be derived from the RGB cube. The diagonal of this cube from black (the origin) to white corresponds to the v axis of the hex cone. Also, each sub cube of the RGB cube corresponds to a hexagonal cross- sectional area of the hexatone. At any cross section, all sides of the hexagon and all radial lines from the V axis to any vertex have the value V. For any set of RGB values, V is equal to the maximum values in this set. The HSV point corresponding to the set of RGB values lies on the hexagonal cross section at value V. Parameters S is then determined as the relative distance of this point from the V axis. Parameter H is determined by calculating the relative position of the point within each sextant of the hexagon. An algorithm for mapping any set of RGB values into the corresponding HSV values is in the following procedure. We obtain the transformation from HSV parameters to RGB parameters by determining the inverse of the equations in RGB To HSV procedure. These inverse operations are carried out for each sextant of the hex cone. The resulting transformation equations are summarized in the following algorithm. 

 

 


Related Discussions:- Hue and saturation

General perspective transformation, General Perspective transformation w.r....

General Perspective transformation w.r.t. an arbitrary center of projection Suppose here that the COP is at C(a,b,c), as demonstrated in Figure. By Figure, the vectors CP

Morphing - key frame systems, Morphing - Key Frame Systems Transformati...

Morphing - Key Frame Systems Transformation of object shapes from one form to the other is termed as morphing as short form of metamorphism. This method can be applied to any o

Advantages of the z-buffer method, Advantages of the z-buffer method:      ...

Advantages of the z-buffer method:              1) The z-buffer method or algorithm is easy to apply and it needs no sorting of surface in a scene. 2) In z-buffer algorithm

What are the features of inkjet printers, What are the features of Inkjet p...

What are the features of Inkjet printers?  They can print 2 to 4 pages/minutes. Resolution is about 360d.p.i. Thus better print quality is achieved. The operating

Introduction of visible surface detection, Introduction of Visible Surface ...

Introduction of Visible Surface Detection For displaying a realistic presentation of the given 3Dimentional object, hidden surfaces and hidden lines should be identified fo

Relation between polar coordinate and cartesian system, Relation between po...

Relation between polar coordinate system and Cartesian system A frequently utilized non-cartesian system is Polar coordinate system. The subsequent figure A demonstrates a pol

Applications of computer graphics, Applications of Computer Graphics Wh...

Applications of Computer Graphics When you begin using a computer and open an application, you simply click on a graphics object, called icon. When you watch TV, several times

Diffuse reflection - polygon rendering & ray tracing methods, Diffuse Refle...

Diffuse Reflection - Polygon Rendering & Ray Tracing Methods It is characteristic of light reflected from a non-shiny, dull surface. Objects illuminated solely through diff

Multimedia applications, what are activities to be undertaken or executed a...

what are activities to be undertaken or executed and the expected output of each activity for a plan creation of a movie?

Audio and video, AUDIO AND VIDEO: Audio and video are working as eye and e...

AUDIO AND VIDEO: Audio and video are working as eye and ear of multimedia. Both of them are heavily contributing to any type of multimedia application. Here we discuss something r

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd