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  Video Graphics Array

Introduction to Video Graphics Array (VGA)

A computer display standard firs marketed in 1987 by IBM is termed as VGA (video graphics array). VGA can be observed as an improvement of and successor to the preceding EGA and CGA graphics adapters. MCGA, also generated through IBM, was supposing that it was a simple version of the VGA hardware.

The VGA maintains both all points' addressable graphics modes and alphanumeric text modes. Standard graphic modes are as follows:

i. 640 x 480 in 16 colours

ii. 640 x 400 in 16 colours

iii. 320 x 200 in 16 colours

iv. 320 x 200 in 256 colours (Mode 13h)

Also the standard modes. The VGA supports several of the modes of its predecessors the EGA, CGA and because of its configurable nature, un-documented modes.

PROGRAMMING TRICKS

A not documented, but well-liked 256colour mode called mode X was employed to create presented programming techniques and graphics resolutions not feasible in the standard Mode 13h. This was a trade off for additional complexity and performance loss in a few types of graphics operations.

TEXT MODES

Standard alphanumeric text modes for the VGA are 80x25 and 40x25 text cells. Each cell may choose from on 16 available colours for its foreground and 8 colours for the background. The character might also be created to blink, or a expense of the blinking option, the background might be chosen from 16 colours.

VGA adapters generally support both a color text mode and a monochrome, although the monochrome mode approximately never used. Black and white text on almost all modern VGA adapters is drawn through gray colored text on black background in color mode.

HARDWARE DETAILS

In color mode, every screen character is in fact represented through two bytes. The lower, or character byte is the general character for the current character set, and the higher, or attribute byte is a bit field that is employed to select several vide attributes like character set, color, blinking, and so forth.

 VGA CAMERA

When most digital cameras and other electronic devices that consist of cameras no longer make use of the outdated VGA standard there were still some applications in which it remains helpful.

FUNCTION

VGA (video graphics array) cameras are digital cameras which store their images directly inside the memory of camera or onto an attached memory card. The images can then be transmitted to a computer for printing or delivered to a TV screen for public viewing through connecting a cable among the camera.

FEATURES

Cameras which contain the VGA designation take pictures which contain a resolution of 640 X 480 that means that a picture will be 640 *480 pixels. Images that have has that size do not take up much space so most VGA cameras comprise small amount of internal memory.

There Are 4 TYPES OF VGA CAMERA USE

i. Cellular phones

ii. Toy cameras

iii. Megapixel rating cameras

iv. Binoculars

MISCONCEPTIONS

The VGA rating considers only to size and not to clarity. 640 x 480 pixels is regarding to the equal of a 0.3 megapixel image. The issues of clarity loss and distortion only take place while the image is either enlarged beyond the original parameters of it for printing or viewed on a screen which uses a larger resolution. Because of the several modern monitors and TV screens make use of a 1280 x 1024 resolution.

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