What Are Bitmap Images?

A bitmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits. Now, along with pixmap, it commonly has a similar concept to that of a spatially mapped array of pixels. Raster images in general may be referred to as bitmaps or pixmaps, whether synthetic or photographic, in files or memory.
Bitmap images refer to those described by pixels - squares of color arranged in a grid.

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What Are Vector Graphics?

Vector graphics is the use of polygons to represent images in computer graphics. Vector graphics are based on vectors, which lead through locations called control points or nodes. Each of these points has a definite position on the x and y axes of the work plane and determines the direction of the path; further, each path may be assigned various attributes, including such values as stroke color, shape, curve, thickness, and fill.

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Why Use Vector Images?

An image does not have any structure: it is just a collection of marks on paper, grains in film, or pixels in a bitmap. While such an image has its way, it has some limits. If the image is magnified to an extent, its artifacts will appear. The halftone dots, film grains and pixels become apparent. Images of sharp edges become fuzzy or jagged. See, for example, pixelation.
To the contrary, a vector image does not have the same problem. Edges are represented as a mathematical lines or curves, and they can be magnified thousands of times — until the precision of the numbers becomes an issue.

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What Is Tracing? Vectorization?

In computer graphics, image tracing, raster-to-vector conversion or vectorization is the conversion of raster graphics into vector graphics.
Vectorization starts with an image which can be vectorized manually by hand or be done automatically by various computer pograms.

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