To ensure your photos, scanned images, and other bitmap files are of high quality when output, it's essential to use the correct resolution. Keep in mind that resolution is not a factor for PostScript vector graphics, as they will be printed at the maximum resolution of the output device. Below are recommended resolutions for common output formats.
Web Page
For web use, 72dpi is standard. When resizing images for the web, it's best to ignore the "Print Size" settings in Photoshop’s Resize Image dialog and focus solely on pixel dimensions. This ensures your image looks sharp on screens without unnecessary file bloat.
Newspaper
When scanning for newspaper printing, aim for a resolution between 125 to 170dpi. The image resolution should be 1.5 to 2 times the screen ruling (lpi) used in the printing process. For newspapers, which typically use 85lpi, doubling the resolution (around 170dpi) gives more flexibility and better detail.
Magazine or Promotional Material
Magazines usually require higher quality, so scan at 300dpi. This matches the standard screen rulings of 133 or 150lpi commonly used in print. This ensures sharp, professional results when the image is reproduced.
High-Quality Books
For high-end books, use a scanning resolution of 350 to 400dpi. Most finely printed books use a screen ruling of 175 to 200lpi, so this higher resolution helps maintain clarity and detail in the final product.
Wide Format Printing
For large format prints like posters or banners, lower resolutions such as 75 to 150dpi are often sufficient. The acceptable resolution depends on how far the viewer will be from the image. For example, a banner hanging from the ceiling can have a lower resolution than a sign behind a cash register, which needs to be clear up close. Always consider the viewing distance when choosing your resolution.
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