The concept of pixel map. Pixels are units for calculating digital images. Pixel is the smallest graphic unit, and usually only one color point is displayed on the screen. After the pixel map is enlarged by software, you will see pixels like mosaics, and the edges are jagged and blurred.

For a typical example, look at the word "He" formed when many square columns were turned upside down at the opening ceremony of the 2008 Beijing Olympic Games. We can imagine everyone as a pixel, and the word "he" is like a picture composed of multiple pixels. Digital images in our lives are made up of thousands of pixels.

The concept of vector graph. Vector diagram has no concept of pixel, it is an object-oriented image or drawing image, mathematically defined as a series of points connected by lines. Vector uses a mathematical algorithm, and any enlargement or reduction will not change its clarity!

Extended data:

definition

Vector diagram uses straight lines and curves to describe graphics. The elements of these graphs are points, lines, rectangles, polygons, circles and arcs. , are calculated by mathematical formulas. For example, the vector diagram of flowers is actually the outline of the outer frame formed by line segments. The color of the outer frame and the color surrounded by the outer frame determine the color displayed by the flowers.

Vector diagram is also called object-oriented image or drawing image, and the traditional version is called vector diagram. In computer graphics, images are represented by geometric primitives based on mathematical equations, such as points, lines or polygons. The greatest advantage of vector graphics is that it will not be distorted regardless of enlargement, reduction and rotation; The biggest drawback is that it is difficult to express realistic image effects with rich color levels.

Because each object is an independent entity, it can maintain its original clarity and curvature. This means that they can be displayed on the output device at the highest resolution.

Vector diagrams are mostly geometric figures, which can be infinitely enlarged, not discolored or blurred. Commonly used in the design of patterns, signs, VI, words and so on. Commonly used softwares include CorelDraw, Illustrator, Freehand, XARA, CAD, etc.

merits and demerits

1, the file is small, and the information of lines and blocks is stored in the image, so the vector graphics file has nothing to do with the resolution and image size, but only with the complexity of the image, and the image file occupies less storage space.

2. The image can be scaled infinitely. When you scale, rotate, or deform a graph, the graph does not have a jagged effect.

3. High-resolution printing can be adopted, and vector graphics files can be printed and output on any output device printer with the highest printing or printing resolution.

4. The biggest drawback is that it is difficult to express realistic image effects with rich color levels.

5. The effect of vector diagram and bitmap is very different. The vector diagram is infinitely magnified and not blurred. Most bitmaps are derived from vectors. It can also be said that vector diagram is the source code of bitmap, and the source code can be edited.

Baidu Encyclopedia-Vector Diagram