Scan the tile with the test square, and save it to a folder that you know the location of. It is best to save in a standard file format such as .pdf, .jpg or .jpeg, or .png, etc, rather than the proprietary format of your scanner.

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Burdastyle

http://burdastyle.com//techniques/turn-your-paper-patterns-into-pdfs-using-free-software/technique_steps/4