by Dinesh Thakur Category: Basic of Computer Graphics

The positively charged ELECTRODE that attracts ELECTRONS within a current-consuming device such as an electrolytic cell, discharge tube or valve. In a current-producing BATTERY, the anode is the electrode that receives electrons internally and hence is connected to the external negative terminal.

 
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: Basic of Computer Graphics

Aspect ratiois a fancy term for "proportion," or the ratio of width to height. for example 4:3 for a computer screen. For instance, if a direction in a software manual tells you to "hold down the Shift key while you resize a graphic in order to maintain the aspect ratio," it simply means that if youdon'thold down the Shift key you will stretch the image out of proportion.



 
by Dinesh Thakur Category: Basic of Computer Graphics

Aliasing

Aliasing has two definitions, depending on whether you're talking about pictures or sounds.

When a diagonal line or a curved arc drawn on the screen looks as if it was made out of bricks, when it looks like stair steps instead of a slide, the effect is technically called aliasing. Most of us would say it had the jaggies. It can be ameliorated by the technique of ANTIALIASING.

 
by Dinesh Thakur Category: Basic of Computer Graphics

On a color monitor, each pixel has three dots arranged in a triad-red, green, and one blue dot. Each dot can deal with a maximum of 8 bits, which makes a total of 24 bits per pixel. With the possibility of combining the 256 levels of color in each of the three color dots, 24-bit color gives you the awesome potential of 16.7 million colors on your screen (256 times 3). Many of these colors differ so slightly that even the most acute observer couldn't tell the difference between them. Simply stated: 16 million colors is more than enough. (How do you get black and white if there are three colored dots? If all dots are on, the pixel is white; if all dots are off, the pixel is black.)

 
by Dinesh Thakur Category: Basic of Computer Graphics

On a grayscale monitor, each pixel can accept from 1 to 8 bits of data, which will show from 1 to 256 shades of gray.

If there are 2 bits per pixel, there are four possible combinations of on and off: on/on, off/off, on/off, and off/on. Each of these combinations displays a different shade of gray (including black and white).

 
by Dinesh Thakur Category: Basic of Computer Graphics

If an item is monochrome, that means it uses only one color on a differently colored background. In a monochrome monitor, these pixels have only one color phosphor. The picture is created with, say, black dots (or lines) against a white background. A monochrome image pixel can have two values, on (white) or off (black), and this can be represented by 1-bit as either 0 or 1. Most printers are monochrome, meaning they only print black toner on white paper.



 
by Dinesh Thakur Category: Basic of Computer Graphics

Data compression is the function of presentation layer in OSI reference model. Compression is often used to maximize the use of bandwidth across a network or to optimize disk space when saving data.

 
by Dinesh Thakur Category: Basic of Computer Graphics

All operations on computers are in terms of 0’s and 1’s and hence figures are also to be stored in terms of 0’s and 1’s. Thus a picture file, when viewed inside the memory, can be no different from other files – a string of Os and 1s. However, their treatment when they are to be displayed makes the difference. Pictures are actually formed with the help of frame-buffer display as follows

 
by Dinesh Thakur Category: Basic of Computer Graphics

Interactive graphics display consists of three components

 

a) A display controller

b) A digital memory or frame buffer

c) A television monitor

d) A video controller

 
by Dinesh Thakur Category: Basic of Computer Graphics

Unfortunately, the concept of graphics of displaying pictures is lot more complicated than what has been described so far - evaluate the points using the equations, store them in a file and use raster graphics methods or use simple line drawing algorithms.

 
by Dinesh Thakur Category: Basic of Computer Graphics

The following are also considered graphics applications

Paint programs: Allow you to create rough freehand drawings. The images are stored as bit maps and can easily be edited. It is a graphics program that enables you to draw pictures on the display screen which is represented as bit maps (bit-mapped graphics). In contrast, draw programs use vector graphics (object-oriented images), which scale better.

 
by Dinesh Thakur Category: Basic of Computer Graphics

The primary output device in a graphics system is a video monitor. The operation of most video monitors is based on the standard cathode ray tube (CRT) design.



 
by Dinesh Thakur Category: Basic of Computer Graphics

A frame buffer is a large, contiguous piece of computer memory. At a minimum  there is one memory bit for each pixel in the rater; this amount of memory is called a bit  plane. The picture is built up in the frame buffer one bit at a time.



 
by Dinesh Thakur Category: Basic of Computer Graphics

Image resolution describes the detail an image holds. The term applies equally to digital images, film images, and other types of images. Higher resolution means more image detail. Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved.

 
by Dinesh Thakur Category: Basic of Computer Graphics

A pixel (short for picture element, using the common abbreviation "pix" for "picture") is one of the many tiny dots that make up the representation of a picture in a computer's memory. Each such information element is not really a dot, nor a square, but an abstract sample.



 
by Dinesh Thakur Category: Basic of Computer Graphics

When choosing a monitor, one of the factors that the customer usually considers is the refresh rate. A high refresh rate is important in providing a clear picture and avoiding eye fatigue.

 
by Dinesh Thakur Category: Basic of Computer Graphics

Today there are very few aspects of our lives not affected by computers. Practically every cash or monetary transaction that takes place daily involves a computer. In many cases, the same is true of computer graphics. Whether you see them on television, in newspapers, in weather reports or while at the doctor’s surgery, computer images are all around you.



 
by Dinesh Thakur Category: Basic of Computer Graphics

The refresh rate is the number of times in a second that display the data it’s being given. This is distinct from the measure of from rate in that the refresh rate includes the repeated drawing of identical while trans rate measures how a video source can lead an entire frame of new data to a display.

 
by Dinesh Thakur Category: Basic of Computer Graphics

In Shadow Mask CRT tiny holes in a metal plate separate the colored phosphors in the layer behind the front glass of the screen. The holes are placed in a manner ensuring that electrons from each of the tube's three cathode guns reach only the appropriately-colored phosphors on the display.

 

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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 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.