Creating pixels using graphics
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A pixel is the smallest controllable element that appears on a display screen. It is a rectangle unit that can be programmed to different colors. The color is a blend of red, green, and blue intensities. Higher resolution screens have smaller pixel sizes. Pixels are generated using either beam penetration or shadow mask methods in CRT displays. Beam penetration directly activates color phosphors, while shadow mask uses 3 electron guns and a mask to combine colors. Resolution is specified as number of pixel columns and rows.
Creating pixels using graphics
- 1. .
- 2. What is a pixel? 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.
- 3. The shape of 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.
- 4. Pixel appears on the 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.
- 5. Pixel Resolution can 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.
- 6. Generating of pixels: pixels can be generated by CRT(cathode ray tubes) in two diff techniques: 1. Beam-penetration method 2. Shadow-mask method
- 7. Beam-penetration method: In this 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.
- 8. 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.
- 9. The shadow mask 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.”
- 10. Shadow mask CRT:
- 11. Example :
- 12. Requirements: Operating system: windows Ram: above 512 mb Software: Turbo c or dosbox Graphics: C graphics
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