Multi-tonal copy evident document methods and products

A method of printing a multi-tonal document with enhanced copy evident distortions security features, the method comprising:

• converting an electronic source graphic file into a converted electronic digital security file including a multi-tonal background screen image area including a first set of halftone elements and a multi-tonal foreground hidden warning text and/or graphic screen image area including a second set of halftone elements, wherein said first set of halftone elements are smaller in size than said second set of halftone elements;
• and
• printing the converted electronic digital security file creating a printed document with said multi-tonal background and said multi-tonal foreground, wherein when said printed document is electronically copied creating a copy of said printed document, said foreground areas appear differently from the background area on said copy of said printed document.

An article comprising a storage medium having stored thereon instruction that when executed by a machine result in the following operations:

• converting an electronic source graphic file into a converted electronic digital security file including a multi-tonal background screen image area including a first set of halftone elements and a multi-tonal foreground hidden warning text and/or graphic screen image area including a second set of halftone elements, wherein said first set of halftone elements are smaller in size than said second set of halftone elements;
• and
• printing the converted electronic digital security file creating a printed document with said multi-tonal background and said multi-tonal foreground, wherein when said printed document is electronically copied creating a copy of said printed document, said foreground areas appear differently from the background area on said copy of said printed document.