Digital Design for Print and Web by John DiMarco

Author:John DiMarco
Language: eng
Format: epub
Publisher: Wiley
Published: 2010-05-28T04:00:00+00:00

Vector Graphics for Print and Web

Vector graphics have built-in transparency. Instead of importing into a page layout program like InDesign or a digital imaging program like Photoshop, with a white bounding box, vector images (CMYK .eps files) have a transparent background.

The file format used for printing vector files is .eps. Vector graphics can be rasterized to convert them from points and paths to pixels. You must rasterize vector images before you can use them in a Web page. Exporting an image as a .jpg or .gif in a vector program, or opening the vector image in a digital imaging application such as Adobe Photoshop or Adobe Fireworks, will automatically rasterize the image and turn it into a bitmap graphic. However, vector formats are native to Adobe Flash, a vector-based motion graphics program; therefore, the same paths and points that exist in Illustrator are also utilized in Flash.

The most common graphical objects that are created in vector-based programs such as Adobe Illustrator are logos, line art graphics (buttons and icons), and illustrations. Text-based designs are also created using vector programs.

Vector graphics are high resolution and 300 ppi at any size. That is why they are the format used for logos, which usually have to be printed at many different sizes—on banners (big) and business cards (small), for example. Vectorgraphics also provide smooth, clean, sharp lines when printed on a PostScript printing device such as a laser printer or a wide-format poster printer.

FIGURE 6-1 Vector graphics are made up of anchor points and line segments. Graphics created in vector programs can be scaled without losing quality.

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