Computer graphics(CS-604B)
Aspect ratio is the ratio of the width of an image to the height of the image. This ratio is expressed as x:y, and differs in case of different images used in photography, television, computer applications and so on. Changing this ratio may distort the images. The resolution of an image is the total number of pixels displayed on your computer or television screen. Generally, the higher the resolution, the higher is the quality of the image.
Comparison chart
 | Aspect Ratio | Resolution |
|---|---|---|
| Definition | Aspect ratio is the ratio of the width of an image to the height of the image (x:y). | The resolution of an image is the total number of pixels displayed on your computer or television screen. |
| About | Original aspect ratio (OAR) and Modified aspect ratio (MAR) are the dimensions in which the film is originally produced, or altered to fit a particular screen, respectively. | The resolution of digital images can be described as pixel resolution, spatial resolution, spectral resolution, temporal and radiometric resolution. |
| Commonly used | The common aspect ratios used are 1.33:1, 1.37:1, 1.43:1, 1.50:1, 1.56:1, 1.66:1, 1.75:1, 1.78:1, 1.85:1, 2.00:1, 2.20:1, 2.35:1, 2.39:1, 2.55:1 and other ratios. | The common monitor resolutions are 640x480, 800x600 and 1024x768. |
Difference between Vector scan or Random scan and Raster scan display.
| S. No. | Vector scan or Random scan display | Raster scan display |
| 1 | It can only draw lines and characters | It can draw areas filled with colors. |
| 2 | Scanning is done between the end points | Scanning is done one line at a time from top to bottom and left to right. |
| 3 | For a complex image a vector scan display may flicker | Even for a complex image a raster scan display does not flicker |
| 4 | Scan is not converted to pixels | Scan is converted to pixels. |
| 5 | Video Controller is not required. | Video Controller is required. |
| 6 | Is costlier | Is cheaper |
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