To ensure that your photos, scanned images, and other bitmap files are of high quality when printed, it's essential to use the correct resolution. Keep in mind that resolution is not a concern for PostScript vector graphics, as they will be printed at the maximum resolution of the output device. Below are the recommended resolutions for common output formats.
Web Page
For web use, 72dpi is standard. When resizing an image for the web, it's best to ignore the "Print Size" option in Photoshop's Image Size dialog and focus on pixel dimensions instead. This ensures the image looks sharp on screens without unnecessary file size increases.
Newspaper
When scanning images for newspaper printing, aim for a resolution between 125-170dpi. The final print resolution should be 1.5 to 2 times the screen ruling (lpi). Since newspapers typically use 85lpi, using 2x the lpi (around 170dpi) will result in better image quality and more flexibility during the printing process.
Magazine or Promotional Material
Magazines usually require higher quality, so scan images at 300dpi. This matches the standard screen ruling used in magazine printing, which is around 133 or 150lpi. Using 300dpi ensures that details remain clear and crisp when printed.
High-Quality Books
For beautifully printed books, aim for a scanning resolution of 350-400dpi. Most high-end book printing uses a screen ruling of 175-200lpi, so matching this with a higher resolution ensures that the images look sharp and professional, even when viewed up close.
Wide Format Printing
For large format prints like posters or banners, a lower resolution can be acceptable, depending on how far the viewer will be from the image. A resolution of 75-150dpi is often sufficient. For example, a banner hanging from the ceiling doesn’t need to be as sharp as a menu behind a cash register, which is viewed up close. Always consider the viewing distance when choosing the appropriate resolution for large-scale prints.
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