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Adobe illustrator - an introduction
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Adobe® Illustrator® is a professional quality graphic art program. Its applications are diverse, from creating print to web graphics and, for our purposes, posters. Although the program is complex and requires a significant amount of time to truly master, it is quite easy to learn the basics and create work with a professional appearance.

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Vector art is key for printing. Since the art is made from a series of mathematical curves it will print very crisply even when resized. For instance, one can print a vector logo on a small sheet of copy paper, and then enlarge the same vector logo to billboard size and keep the same crisp quality. A low-resolution raster graphic would blur or pixelate excessively if it were enlarged from business card size to billboard size.

The logo on the left created in illustrator could be enlarged to 30 meters and remain crisp!!!.

   
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About bitmap images and vector graphics


Before working with vector shapes and vector paths, it's important to understand the basic differences between the two main categories of computer graphics: bitmap images and vector graphics. You can use Photoshop to work with either type of graphic; in fact, you can combine both bitmap and vector data in an individual Photoshop image file.
Bitmap images, technically called raster images, are based on a grid of colors known as pixels. Each pixel is assigned a specific location and color value. In working with bitmap images, you edit groups of pixels rather than objects or shapes. Because bitmap graphics can represent subtle gradations of shade and color, they are appropriate for continuous-tone images such as photographs or artwork created in painting programs. A disadvantage of bitmap graphics is that they contain a fixed number of pixels. As a result, they can lose detail and appear jagged when scaled up onscreen or printed at a lower resolution than they were created for.
Vector graphics are made up of lines and curves defined by mathematical objects called vectors. These graphics retain their crispness whether they are moved, resized, or have their color changed. Vector graphics are appropriate for illustrations, type, and graphics such as logos that may be scaled to different sizes. The major disadvantage of using a vector image is the amount of effort required to produce a highly detailed image.

   
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