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by Dinesh Thakur Category: Basic of Computer Graphics

A class of techniques for shrinking the size of a data file to reduce its storage requirement, by processing the data it contains using some suitably reversible algorithm. Compression methods tend to be more effective for a particular kind of data, so that text files will typically be compressed using a different algorithm from graphics or sound files.

 
by Dinesh Thakur Category: Basic of Computer Graphics

Bump Mapping: An extension of the technique Of TEXTURE MAPPING to create more realistic 3D images, in which an additional BITMAP (the bump map) applied to a surface contains not colour data but small displacements to be applied to the surface normal at each point. After the image is rendered, these displacements alter the angles of reflected rays in such a way as to convey the illusion of surface relief, even though the surface actually remains completely smooth.

 
by Dinesh Thakur Category: Basic of Computer Graphics

Analogue video: A video signal that is captured transmitted and stored as a continuously varying voltage, rather than as a stream of bits as in digital video. Up until the advent of digital TV in the late 1990S, television worked by transmitted analogue video signals, and older video tape recorders such as VHS, PAL, Betamax and Umatic all store analogue signals.

 
by Dinesh Thakur Category: Graphics Devices

Raster Scan methods have increasingly become the dominant technology since about 1975. These methods use the TV type raster scan. The growth in the use of such methods has been dependent on rapidly decreasing memory prices and on the availability of cheap scan generating hardware from the TV industry.



 
by Dinesh Thakur Category: Graphics Devices

Conceptually the Direct View Storage Tube (DVST) behaves like a CRT with highly persistent phosphor. Pictures drawn on there will be seen for several minutes (40-50 minutes) before fading. It is similar to CRT as far as the electronic gun and phosphor-coated mechanisms are concerned. But instead of the electron beam directly writing the pictures on the phosphor coated CRT screen, the writing is done with the help of a fine-mesh wire grid.

 
by Dinesh Thakur Category: Graphics Devices

This was one the earlier CRTs to produce color displays. Coating phosphors of different compounds can produce different colored pictures. But the basic problem of graphics is not to produce a picture of a predetermined color, but to produce color pictures, with the color characteristics chosen at run time.

 
by Dinesh Thakur Category: Graphics Devices

Plasma displays are bright, have a wide color gamut, and can be produced in fairly large sizes, up to 262 cm (103 inches) diagonally. They have a very low-luminance "dark-room" black level, creating a black some find more desirable for watching movies. The display panel is only about 6 cm (2½ inches) thick, while the total thickness, including electronics, is less than 10 cm (4 inches).

 
by Dinesh Thakur Category: Graphics Devices

Factors in determining refresh rates

A refresh rate is dependent upon a monitor's horizontal scanning frequency and the number of horizontal lines displayed.The horizontal scanning frequency is the number of times the electron beam sweeps one line and returns to the beginning of the next in one second. Horizontal scanning frequency is measured in kilohertz (kHz).

 
by Dinesh Thakur Category: Graphics Devices

One of the basic and commonly used display devices is Cathode Ray Tube (CRT). A cathode ray tube is based on the simple concept that an electronic beam, when hits a phosphorescent surface, produces a beam of light (momentarily - though we later describe surfaces that produce light intensities lashing over a period of time).

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to contact us.



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