Creating pixels using graphics

Creating pixels using graphics

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  What is apixel?  A pixel is the smallest visual element on a video display screen.  The pixel (a word invented from "picture element") is the basic unit of programmable color on a computer display or in a computer image.
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   The shapeof a pixel is rectangle. .  Think of it as a logical - rather than a physical - unit.  The physical size of a pixel depends on how you've set the resolution for the display screen.  Usually we are using high resolution screen so the pixel size is very very small.  Pixels can be available in different colors.
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  Pixel appears onthe screen..:  The specific color that a pixel describes is some blend of three components of the color spectrum – RGB (Red,Green,Blue). The intensity of each pixel is variable; in color systems, each pixel has typically three or four dimensions of variability such as red, green and blue, or cyan, magenta, yellow and black.
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   Pixel Resolutioncan is set of two positive . integer numbers, where the first number is the number of pixel columns (width) and the second is the number of pixel rows (height), for example as 640 by 480.  At present different types of resolution screens are available in the market.  The highest Resolution is 1360 by 768.
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  Generating of pixels: pixels can be generated by CRT(cathode ray tubes) in two diff techniques:  1. Beam-penetration method  2. Shadow-mask method
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  Beam-penetration method:  Inthis method the red, green and blue phosphorus are coated in layers - one behind the other.  If a low speed beam strikes the CRT, only the red colored phosphorus is activated, a slightly accelerated beam would activate both red and green (because it can penetrate deeper) and a much more activated one would add the blue component also.
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  Shadow mask method: This works, on the principle of combining the basic colors - Red, green and Blue - in suitable proportions to get a combination of different colors.  But it's principle is much more sophisticated and stable than beam penetration method.
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   The shadowmask CRT, instead of using . one electron gun, uses 3 different guns placed one by the side of the other to form a triangle or a "Delta.”
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  Shadow mask CRT:
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  Example :
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  Requirements:  Operating system:windows  Ram: above 512 mb  Software: Turbo c or dosbox  Graphics: C graphics
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  Batch No:14  V.Bala venu 11003235 M.Rahul 11003275 T.Srikanth 11003297 N.Sri ram 11003298