What is Resolution?
Resolution is a measurement of image quality. In printing, resolution is measured by DPI (dots per inch). Screen resolution is measured by PPI (pixels per inch). As the resolution number gets higher, so does the image quality. Why? The more dots or pixels you have in a concentrated area, results in a sharper and more detailed image.
The recommended file resolution in offset printing is at least 300ppi. Any artwork lower than that can result in “fuzzy” or “pixelated” images. If you’re scanning in original artwork, the rule of thumb is to scan in at the highest resolution possible. This will give you more flexibility with what you can do.
Tip: Make sure each individual element used in your design is at least 300ppi. Nesting lowere resolution images into a high resolution document will not improve their quality.