A method of manufacturing a document of a series identical documents in content except for a respective identifier which identifies each document within the series, each identifier having at least a first indicium, the or each indicium defining a boundary; the method having the steps of: providing a substrate; applying a first background print, defining part of the boundary of an indicium receiving area; applying the respective identifier on the substrate, such that the first indicium is provided in the indicium receiving area; the first background print and the respective identifier being applied such that when the document is viewed in at least one of transmission and reflection the juxtaposition of the first background print and the first indicium is such that a keyline extending around a portion of the boundary of the first indicium is defined between the first indicium and the boundary of the indicium receiving area.

A method of manufacturing a part with an anti-counterfeit feature is provided. The method includes providing a part to be marked for anti-counterfeiting. The part is provided with a radiation impacting feature on or within the part. The radiation impacting feature is configured to at least one of (i) prevent accurate imaging of at least a portion of the part and (ii) provide unique authentication of the part.

Disclosed herein is a method for encoding an illustration on a target surface, where the illustration may be visible when light is shone on the surface from a light source with a predetermined position. The method may include converting the illustration into a grayscale illustration, specifying the position of the light source; generating a three dimensional surface having a grid of smaller surfaces thereon, where each smaller surface may represent a corresponding pixel of the grayscale illustration. Each smaller surface may be oriented with respect to the light source such that reflected light from each smaller surface has a reflection intensity equal to the light intensity of the corresponding pixel of the greyscale illustration; and making the target surface out of a material using the generated three dimensional surface as a template.

A novel security feature for a valuable and/or security product is formed by a pattern that is formed on at least one carrier surface and has a color progression structure that is formed with a digital printing method from pattern elements arranged in a grid. The color progression structure is produced with at least two luminescence media that exhibit spectrally different luminescences. The valuable and/or security product according to the invention has one or more product carriers and at least one security feature that is arranged on or in the product carrier or carriers.

A novel security feature for a valuable and/or security product is formed by a pattern that is formed on at least one carrier surface and has a color progression structure that is formed with a digital printing method from pattern elements arranged in a grid. The color progression structure is produced with at least two luminescence media that exhibit spectrally different luminescences. The valuable and/or security product according to the invention has one or more product carriers and at least one security feature that is arranged on or in the product carrier or carriers.

A print feedstock has a base material and a marker material, the base material and the marker material having different physical properties. A system to validate objects includes at least one printer to print feedstock onto an object, the feedstock comprising a base material and a marker material, the base material and a marker material having different properties, a device to create a unique identifier for the object based upon a pattern of the feedstock, and a store in which the unique identifier can be stored.

A print feedstock has a base material and a marker material, the base material and the marker material having different physical properties. A system to validate objects includes at least one printer to print feedstock onto an object, the feedstock comprising a base material and a marker material, the base material and a marker material having different properties, a device to create a unique identifier for the object based upon a pattern of the feedstock, and a store in which the unique identifier can be stored.

The invention relates to a method for producing a security feature (1) in the form of a colored image (2), a colorant being applied to a substrate (3) to produce the image, the image (2) being subdivided into grid areas, immediately adjacent grid areas (4, 5, 6, 9, 10, 11) of the image (2) partially overlapping, an overlapping area (7, 8) of immediately adjacent grid areas (4, 5, 6, 9, 10, 11) being smaller than one of the grid areas (4, 5, 6, 9, 10, 11), grid areas (4, 5, 6, 9, 10, 11) of the image (2) being each assigned at least one color, and at least the areas of the substrate (3) corresponding to the respective grid areas (4, 5, 6, 9, 10, 11) minus the corresponding overlapping areas (7, 8) being covered with at least one colorant of the respectively assigned color, the overlapping areas (7, 8) between adjacent grid areas (4, 5, 6, 9, 10, 11) being covered at least with the colorant having the color assigned to one of the grid areas (4, 5, 6, 9, 10, 11) overlapping in the respective overlapping areas (7, 8).

The invention relates to a method for producing a security feature (1) in the form of a colored image (2), a colorant being applied to a substrate (3) to produce the image, the image (2) being subdivided into grid areas, immediately adjacent grid areas (4, 5, 6, 9, 10, 11) of the image (2) partially overlapping, an overlapping area (7, 8) of immediately adjacent grid areas (4, 5, 6, 9, 10, 11) being smaller than one of the grid areas (4, 5, 6, 9, 10, 11), grid areas (4, 5, 6, 9, 10, 11) of the image (2) being each assigned at least one color, and at least the areas of the substrate (3) corresponding to the respective grid areas (4, 5, 6, 9, 10, 11) minus the corresponding overlapping areas (7, 8) being covered with at least one colorant of the respectively assigned color, the overlapping areas (7, 8) between adjacent grid areas (4, 5, 6, 9, 10, 11) being covered at least with the colorant having the color assigned to one of the grid areas (4, 5, 6, 9, 10, 11) overlapping in the respective overlapping areas (7, 8).

Techniques for manufacturing a light field print using a printing press. The techniques include: identifying at least one characteristic of the printing press at least in part by printing at least one calibration pattern; obtaining content to be rendered using the light field print, the content comprising multiple scene views; generating, based at least in part on the content and the at least one characteristic of the printing press, a front target pattern and a back target pattern; and using the printing press to: print the front target pattern on a first side of a substrate; and print the back target pattern on a second side of the substrate.