The image “resolution” refers to the amount of detail that your artwork holds. The higher the resolution, the more detailed the printout will be.
If a computer image is made up of pixels, a printout is made out of dots with varying sizes delivered by a printer. A given inch in a printed image can hold a number of these dots. The higher the number of dots in an inch, the more detail the printed image gives.
We measure the image resolution with dots per inch (dpi). For the best output, we recommend a measurement of 300 dpi for your artwork.