Original artwork needs to be in electronic format and can be full colour. File formats such as PNG, JPG, GIF, TIFF, PDF normally work well. It is important to ensure artwork is big enough to print without becoming fuzzy when the artwork is made larger. Pictures taken with a cell phone or a camera of images on paper will not work. Images scanned with a high-quality scanner may work however any background imperfections may show on the final print.
The minimum suggested resolution is 300 pixels per inch. A reasonable size would be 2,400 pixels wide by 3,000 pixels high.