COMPUTER GRAPHICS- Computer Science Notes – For W.B.C.S. Examination.

কম্পিউটার গ্রাফিক্স – কম্পিউটার সায়েন্স নোট – WBCS পরীক্ষা।

Computer Graphics

Computer graphics tells us that what are the actual working of graphics. Computer Graphics remains one of the most existing and repladly growing computer feild. Computer Graphics as the pictorial representation or graphical representation of a computer.Continue Reading COMPUTER GRAPHICS- Computer Science Notes – For W.B.C.S. Examination.

Persistance

It is define as the time taken by the emitted light from the screen to decay to 1/10 of its orignal intensity is called persistance. High persistance requierd low refresh rate, and low persistance required high refresh rate. Low persistance screen are used for animation and the high persistance screen are used of static images.

Resolution

The no of pixels or points that can be displayed on the screen without overlap is called resolution. It can also be defined as no of pixel per square inch. For Example 800*600, 1024*768, 1900*1080.

Aspect Ratio

Its give the ratio of vertical points to horizontal points(pixel). Necessary to produce equal length line in both of direction. For Example 3:4 aspect ratio may mean 3 pixel vertical and 4 pixel horizontal are required to draw equal length line.

Direct View Storage Tubes

Its store the picture information as charge distribution just behind the phosphor.Its using two types of guns

Primary Guns : – Its Used To Store The Picture Panel.

Secndary Guns : – Its Maintain The Picture Display.

Advantages And Disadvantages Of DVST

Advantages : – The Major Advantages Of This, No Refreshing Is Required And Complex Picture Can be Displayed Flicker.

Disadvantages : – The Disadvantage Of This type Of Moniter Is Selected Part Of The Picture Cannot be Erased. The Whole Picture has to be Redrawn Which Generally Takes A Lot Of Time Thats Is The Biggest Reasons Of Non Popularity Of These Types Of Devices.

Flat Pannel Display

Flat pannel display are two types

(1) Emissive (2) Non Emissive

Emissive : – Emissive display are those which convert electrical energy to light. For example 1. Plasma Pannel Display 2. LED (Light Emitting Dioade) 3. Thin Electroluminicent Devices.

Non Emissive : – Non Emissive use optional effects to convert sun light or light from any other sources to graphical pattern for example LCD(Liquid Crystal Display).