Vector versus bitmap graphics

Adobe Illustrator creates vector graphics, also called draw graphics, which are made up of shapes based on mathematical expressions. These graphics consist of clear, smooth lines that retain their crispness when scaled. They are appropriate for illustrations, type, and graphics, such as logos, that may be scaled to different sizes.

Bitmap images, also called raster images, are based on a grid of pixels and are created by image-editing applications such as Adobe Photoshop. 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 lose definition and appear jagged when scaled up.

Logo drawn as vector art






Logo rasterized as bitmap art





In deciding whether to use Illustrator or a bitmap image program such as Photoshop for creating and combining graphics, consider both the elements of the image and how the image will be used. In general, use Illustrator if you need to create art or type with clean lines that will look good at any magnification. In most cases, you will also want to use Illustrator for laying out a design, because Illustrator offers more flexibility in working with type and with reselecting, moving, and altering images. You can create raster images in Illustrator but its pixel-editing tools are limited. Use Photoshop for images that need pixel-editing, color correcting, painting, and other special effects