Resolution refers to the level of detail in an image or photograph. It is measured in DPI (Dots Per Inch) or PPI (Pixels Per Inch). DPI is commonly used in printing to describe the number of printed dots contained within one inch of an image. PPI is used in digital contexts to describe the number of pixels within one inch on a digital screen.
Higher resolution (more DPI/PPI) means more detail and clarity in the image. For high-quality prints, a resolution of 300 DPI/PPI is typically recommended, as it ensures the image will be sharp and clear without visible pixelation.
Often clients cannot access the highest resolution images to use for their projects, and typically it is okay at the sizes they are ordering. We will inspect your graphics during the proof process and do our best to notify you if your image has low or medium resolution that may cause blur or pixelation.
When possible, the best solution is to use vector graphics, which can be scaled to any size without loss of quality. However, this only applies to graphic designs (not photographs) or photos that have been converted to vector shapes using methods such as Live Trace, which is a tool in Adobe Illustrator.