A redundantly printed security-enhanced document, printing method and system ensure the meaning of the information imparted by variable indicia printed by redundant printing on the document with removable scratch-off coatings. By printing the variable indicia with multiple colors, redundancy and integrity of the intended indicia is achieved. Additionally, inverted color indicia countermeasures to pinprick attacks are also disclosed. The redundantly printed document, methods and systems enhance the overall appearance of the redundantly printed document, and reduce possible consequences resulting from misprinted variable indicia. The resultant printed process color indicia maintains a grayscale equivalent level of a process color greater than or equal to the measured grayscale equivalent level of the substrate surface plus an additional contrast delta of 15%.

A redundantly printed security-enhanced document, printing method and system ensure the meaning of the information imparted by variable indicia printed by redundant printing on the document with removable scratch-off coatings. By printing the variable indicia with multiple colors, redundancy and integrity of the intended indicia is achieved. Additionally, inverted color indicia countermeasures to pinprick attacks are also disclosed. The redundantly printed document, methods and systems enhance the overall appearance of the redundantly printed document, and reduce possible consequences resulting from misprinted variable indicia. The resultant printed process color indicia maintains a grayscale equivalent level of a process color greater than or equal to the measured grayscale equivalent level of the substrate surface plus an additional contrast delta of 15%.

The printed article includes a medium having a specular reflective layer, a first line composed of a first color formed at the medium, a second line formed at the medium in a second color and formed parallel to the first line, and a prism layer formed onto at least the first line, wherein when the medium is divided into a first region, a second region, and a third region that are continuous in parallel, the first line is disposed in any one region of the first region, the second region, and the third region, the second line is disposed in any one region other than the region where the first line was formed, the prism layer is disposed across two contiguous regions including the region formed with the first line, and the section of the prism layer has a shape of a portion of the non-circular arc approximating the ellipse.

The printed article includes a medium having a specular reflective layer, a first line composed of a first color formed at the medium, a second line formed at the medium in a second color and formed parallel to the first line, and a prism layer formed onto at least the first line, wherein when the medium is divided into a first region, a second region, and a third region that are continuous in parallel, the first line is disposed in any one region of the first region, the second region, and the third region, the second line is disposed in any one region other than the region where the first line was formed, the prism layer is disposed across two contiguous regions including the region formed with the first line, and the section of the prism layer has a shape of a portion of the non-circular arc approximating the ellipse.

A method includes moving a multi-color ribbon over a target object. The multi-color ribbon has a lower layer and an upper layer of inks or pigments. The method also includes applying heat and pressure onto the multi-color ribbon to transfer the overlying layers of the inks or pigments to the target object, and removing at least a portion of the lower layer of the ink or pigment that was transferred to the target object to reveal at least a portion of the upper layer of the ink or pigment that were transferred to the target object.

A halftone raster image, suitable for rendering a continuous-tone image, which comprises a plurality of dots, arranged according a screen ruling and screen angle. Said dots comprise (i) image pixels arranged as a first arc or as a plurality of arcs which together represent a first spiral, and (ii) non-image pixels arranged as a second arc or as a plurality of arcs which together represent a second spiral. Small displacements of the feed point of said dots away from the theoretical centre of a halftone dot, defined by said screen ruling and screen angle, enable a higher image quality and less patterns in said halftone raster image.

A halftone raster image, suitable for rendering a continuous-tone image, which comprises a plurality of dots, arranged according a screen ruling and screen angle. Said dots comprise (i) image pixels arranged as a first arc or as a plurality of arcs which together represent a first spiral, and (ii) non-image pixels arranged as a second arc or as a plurality of arcs which together represent a second spiral. Small displacements of the feed point of said dots away from the theoretical centre of a halftone dot, defined by said screen ruling and screen angle, enable a higher image quality and less patterns in said halftone raster image.

Examples are directed toward anticounterfeit markings printed on a substrate. A method includes determining with a microprocessor running computer executable code non-transitorily stored on tangible computer readable media that: a first microprinting appears on a front side of the substrate as front side markings of first portions of a plurality of characters having dimensions in a micrometer range when viewed from the front side with reflected light, a second microprinting appears on a back side of the substrate as back side markings of second portions of the plurality of characters having dimensions in the micrometer range when viewed from the back side with reflected light, and the first microprinting and the second microprinting in combination appear as microprinting of whole characters of the plurality of characters when viewed with transmitted light.

Examples are directed toward anticounterfeit markings printed on a substrate. A method includes determining with a microprocessor running computer executable code non-transitorily stored on tangible computer readable media that: a first microprinting appears on a front side of the substrate as front side markings of first portions of a plurality of characters having dimensions in a micrometer range when viewed from the front side with reflected light, a second microprinting appears on a back side of the substrate as back side markings of second portions of the plurality of characters having dimensions in the micrometer range when viewed from the back side with reflected light, and the first microprinting and the second microprinting in combination appear as microprinting of whole characters of the plurality of characters when viewed with transmitted light.

A method produces a printed product. The method includes transferring a first Fluid onto at least one section of printing stock, applying a second fluid, having a dewetting effect on the first fluid, onto a form configured as a relief printing form or embossing form, and transferring the second fluid to at least some points of the section. In this manner printed products of high quality can be produced.