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Graphics Image Builder.

JPG, GIF, PDF, EPS? Choosing the Proper Graphic File Formats for Web Pages and Print

Using the proper graphic file format and resolution for the job can mean the difference between a professional-looking document and one that looks blurry or is missing graphics. Graphic file formats for the Internet and offset printing are totally different animals. Do not interchange them!

Graphics File Formats for the Internet

Low-resolution raster graphics are used on the Internet. These graphics are made up of thousands of pixels (squares of color). Internet browsers will read JPG and GIF graphics, which are best scanned or sized at 72 PPI (pixels per inch). Because of the limits of screen resolution, anything greater will result in larger file sizes and longer download times than necessary. All Internet graphics are limited to a special palette of 256 colors.

Scan your photos using RGB colors to the JPG file format. JPG file sizes are very small and compatible with nearly every graphical browser. This format is best suited for photographs and any image that contains a complex mixture of colors.

The GIF format is best suited for images with a limited number of distinct colors and graphics that have sharp, distinct edges (most logos, menus and buttons). A special GIF89a file format gives you the option to make the background transparent so you don’t get a white rectangle behind the graphic.

Graphics File Formats for Offset Printing

Graphics for offset printing require much higher resolution than for websites. If you use a low-resolution graphic (i.e., a logo copied from a website) on an offset printed job, a fuzzy “bitmapped” image—or no image—will result.

Offset printed graphics can be one of two types: Vector-based or high-resolution raster. Raster images (which are color or grayscale digital photos and scans) must be at least 300 PPI (pixels per inch) and in the TIF (Tagged Image File) or EPS (Encapsulated PostScript) file format. Your scans of black and white line art (images that do not contain any shades of gray) must be at least 1200 PPI. Be careful not to enlarge your raster graphics, because the pixels will also enlarge and become more noticeable.

Vector-based graphics are made of mathematically defined lines and curves. Because they are not made of pixels, these unique files can be scaled to any size without losing their crisp, smooth edges. Use professional drawing programs such as Adobe Illustrator, Macromedia Freehand, or Corel Draw to create these types of graphics for printing, saving them in the EPS format.

Color Ink Systems for Printing

Color files for offset printing must be specified with PMS or CMYK inks. Do not use RGB colors unless you are planning to print only to a low-end color desktop printer.

Get an easy-to-follow checklist that ensures your project prints “problem free” every time! What if YOU could know the secrets of a 1st class graphic designer that would help you create amazing marketing materials in a few hours, would you want to know how? Find out now at www.BuyAppealMarketing.com

You are welcome to "reprint" this article on proper graphic file formats as long as it remains complete and unaltered (including my "about the author" section at the end).

About the Author

Karen Saunders is the author of Turn Eye Appeal into Buy Appeal: How to easily transform your marketing pieces into dazzling, persuasive sales tools! Hundreds of business owners have used her simple do-it-yourself design system to create stunning marketing materials that really SELL their products and services! Pick up FREE articles, audio classes, eCourse and ezines at http://www.macgraphics.net

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