The main drawback of the bitmap that the pixel size is fixed. Because of this, in case of resizing the image is greatly distorted picture.
With a decrease in the bitmap , with the existing size of the pixels, some pixels are simply discarded, which leads to the disappearance of a quantity of information. Will not help reduce the size of the pixel, as the output device information, do not take too small pixels and image details coalesce with each other. raster image can be increased only by a multiple number, in two or three times and then only at preserving the original pixel size
The third disadvantage of raster images – a large amount of storage space on your computer. There is also such that, when working with raster images of high definition could not handle users’ computers, and the size of such masterpieces of the hundreds of megabytes.
The second drawback of bitmap – no internal structure. Try to understand the example. For example, we have a drawing machine, and we need to “tear” at the car door. As a result of erasing the door, formed a “hole”.
When working with vector images , most problems disappear. In order to reduce vector image , you need to change only one control parameter is the size of the image. After zooming in, the file size does not increase at all. vector image , has an internal structure, so we are erasing the car door, do not get a hole, and the Vice-then this will be visible to the machine shop.
Below I give you a sign for comparison of computer graphics that vividly reflect the essence of this article.
Types of Computer Graphics
| Characterization | Vector | Raster |
|---|---|---|
| Minimal element of representation. | Primitives: points, lines | Pixel point. |
| The principle of imaging. | With the help of the primitive.Each entity has a formula. | Constructed by means of an aggregate of pixels. |
| Storing information in memory. | Formula, the coordinates of the location, specification, color and shading. | Coordinates, color and options for each pixel: the tone, brightness, saturation. |
| Image sizes. | Relatively small. | Relatively large. |
| Quality when zooming. | Does not lose quality. | A loss of quality, and a partial distortion. |
| Transformations, povoroty skosy. | Does not lose quality. | A loss of quality. |
| The possibility of photo-quality images. | Expressed to a lesser degree. | It is possible to obtain high image (photo) quality. |
| Additional features. | Expressed to a lesser degree. | Very good possibilities. |
| Examples of file formats. | wmf, cdx, fla, swf. | bmp, gif, jpeg, jpg, tif. |
| Graphical editors. | Corel Draw, Flash. | Paint, Photoshop. |
In addition to these kinds of computer graphics , are:
- Fractal – Fractal minimal element.
- Engineering Graphics – Graphic editor Auto CAD.
- 3D graphics.
- Interior design.
On this I finish this article, I hope you are completely finished with raster and vector images.
