Raster scan and Random Scan are the popular approaches used to demonstrate the picture of an object on the screen. Let’s find out some important differences between a raster scan and a random scan.
What is Random Scan?
The random scan is a technique in which the display is constructed through an electron beam, which is directed only to the specific areas of the screen where the image is to be sketched or drawn. The resolution of the random scan display is high, and thus it delivers smooth image drawing. One of the most attractive pointers about the random scan is that it requires less memory. However, the colour range is minimal here.
What is Raster Scan?
A rectangular pattern of image capture in television is known as a raster scan. It is one of the most popular and standard types of graphics monitors which operates CRT. Through the raster scan, we can display real-life images with a variety of shades. Also, it comprises a massive colour range.
Difference between Random Scan and Raster Scan
| S.No | Random Scan | Raster Scan |
| 1. | The resolution is higher than raster scan. | The resolution of raster scan is lower than random scan. |
| 2. | It is more expensive. | It is affordable as compared to the random scan. |
| 3. | In a random scan, it is easy to proceed with modifications. | In raster scan, it is difficult to do any modifications. |
| 4. | In random scans, we don’t prefer interlacing. | In raster scan, we prefer interlacing. |
| 5. | When it comes to image rendering, we prefer mathematical functions. | When it comes to image rendering, we prefer pixels here. It is good for constructing lifelike scenes. |
| 6. | In a random scan, only an area of the screen with a picture is displayed. | In a raster scan, the entire screen is scanned. |
| 7. | In a random scan, it is difficult to fill the solid pattern. | In a raster scan, it is easy to fill the solid pattern. |
| 8. | Example of random scan is Pen Plotter | Example of raster scan is TV Sets. |
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