Image Resolution for Offset Printing - Understanding DPI

When providing images for offset printing projects, resolution is an important factor for achieving optimal print quality. But what exactly is image resolution and how does it relate to DPI in printing?

DPI stands for “dots per inch” and refers to the number of individual dots of ink per inch that a printer can reproduce. Standard offset printing presses print at 150-175 DPI. This means there are 150-175 tiny dots packed into every square inch.

Higher DPI translates to higher image resolution and more visible detail in the print. For quality offset printing, your images should be at least 225-300 DPI at full print size. Lower resolution images will look pixelated or fuzzy when printed.

To find your image resolution in DPI:

• Open the image file and look at the properties or details

• Check the resolution listed (ex. 225 dpi)

• Multiply that by the image width and height

This will give you the total printable dpi. For a 6” x 4” image at 300 dpi, the resolution would be 1800 dpi (6x300) x (4x300).

We recommend scanning images at 350-400 dpi if possible. This allows you to safely scale images up or down without dipping below 225-300 dpi. It gives you flexibility for cropping and layout.

Understanding image resolution helps ensure your printed materials turn out crisp, clear, and professional. Contact us if you have any questions checking your image DPI or preparing files for offset printing.