1. A method of producing image data defining an original image comprising at least one outline-bounded region having at least one outline and an inside area bounded by the outline, the method comprising the steps of: detecting from an original having an initial original image comprising said outline of said at least one outline-bounded region, said initial original image with an image detector, so as to produce image data defining at least one of said outline of said region and said inside area of the region, initially processing said initial original image of said original by forming, with a material detectable by said image detector, at least one detectable image in the inside area of at least one current region out of said at least one outline-bounded region thereby defining at least one initially processed regions, detecting, with said image detector, the initially processed original image so as to produce initially processed image data defining said initially processed original image, and identifying the at least one initially processed region based on a difference of said initial image data and said initially processed image data.