1. A method of generating an image comprising a position identifying pattern and content, the method comprising the steps of: defining criteria relating to a region where the content and the pattern are superimposed, the criteria determining whether the pattern will be distinguishable over the content when applied to a product; with a printer client comprising a computer, identifying such a region in the image; and with the printer client, selecting a characteristic of the pattern or the content in the region identified by the printer client on the basis of the criteria, such that the image in the region meets the criteria.