Once you finish your image, it is saved as mathematical formulas that describe precisely each object, its colors and placement. The drawing is now scalable. When you zoom out or in, the same formulas are used to produce a bigger or smaller version of the drawing by filling in the spaces, and the curves do not appear ragged. The two most common examples of scalable fonts are PostScript and TrueType. A bitmap must describe the color and placement of every dot used in the entire image and its background at a fixed size.
Bitmap files are typically very large.
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