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Art And Logo DesignTaking the High Road On Resolution. Many of us have created a masterpiece, emailed our files off, and shortly thereafter received a call from the printer saying our files were fuzzy or bitmapped. When you create files for your Web sites in a program like Photoshop or Fireworks, you use a resolution of 72 pixels per inch. Print media is executed at a much higher resolution and the film is output at specifications of lines per inch (lpi) and dots per inch (dpi—sometimes called pixels per inch).Before you begin to build your files for print, it's important to know at what line per inch or "line-screen" value your files will be output. It varies from printer to printer and job to job, so it's always a good idea to ask. Not to worry; you're not asking a silly question. If your client, rather than you, is dealing with the printer, tell your client you'll need this information. Newspapers generally print at 85 lines per inch and sometimes higher. That simply means that in one linear inch there are 85 rows of dots. The more lines per inch or the higher the line-screen value, the finer the image. Magazines and books usually print at 133 lines per inch or higher, depending on the quality. Stationery is also usually printed at 133 lines per inch and higher. Once you've established the line-screen value, you'll have the answer to what print resolution—the dpi or pixels per inch—you'll need to use to create your files. Just double the line-screen value. If the printer tells you they'll be printing your files at 133 line-screen, create your files at 266 dots or pixels per inch. If they tell you they'll be printing your files at 150 lines per inch, create your files at 300 dots per inch, and so on. Unless you're doing high-quality, glossy publications, it's very unlikely that you'll need to create your files at any greater than 300 dots or pixels per inch. If you're designing for stationery and can't get the line-screen value from anyone, play it safe at 300 dots per inch. |
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