Abstract:
Printed products, printing methods and methods for authenticating a printed product are provided. In one aspect, the printed product has a receiver member and an image formed thereon by an electrophotographic printing process using toner particles, said image having at least one portion being at least partially formed by bi-fluorescent toner particles. Methods for printing and authenticating the same are provided.
Abstract:
The present invention is directed to a method and system for printing documents with a security image. The security image is formed of dots of a particular size and arranged in a pattern. The size and pattern are selected such that when the printed document is copied on a standard printer, the security image is faded or invisible and therefore the resulting copy is clearly not an original document.
Abstract:
A latent image (16) is incorporated into an apparent solid-color background (28) for representing a desired solid-color background having a target color. An underlying solid-color background (20) is printed on a print medium (18) using a first color composition that differs from the target color. Line-screen patterns (24) embedding a latent image (16) in a visually- integrated setting (26) are printed over the solid-color background (20) using a second color composition that differs from both the first color composition and the target color. The visual characteristics of the line-screen patterns (24) forming the latent image (16) and the visually integrated setting (26) are matched for rendering the latent image (16) practically indistinguishable from the visually integrated setting (26) without a visual aid (30). The print densities of the line-screen patterns and the first and second color compositions are interrelated so that the line-screen patterns (24) in combination with the underlying solid-color background (20) produce the apparent solid-color background (28) in the target color.
Abstract:
A document and a related viewer for the document are constructed as image files capable of transmission to a printing site. The document file contains information for printing a document having hidden security indicia, and the viewer file contains information for printing a document viewer having a decrypting portion for revealing the hidden security indicia in the document.
Abstract:
A latent image is incorporated into an apparent solid-color background for representing a desired solid-color background having a target color. An underlying solid-color background is printed on a print medium using a first color composition that differs from the target color. Line-screen patterns embedding a latent image in a visually integrated setting are printed over the solid-color background using a second color composition that differs from both the first color composition and the target color. The visual characteristics of the line-screen patterns forming the latent image and the visually integrated setting are matched for rendering the latent image practically indistinguishable from the visually integrated setting without a visual aid. The print densities of the line-screen patterns and the first and second color compositions are interrelated so that the line-screen patterns in combination with the underlying solid-color background produce the apparent solid-color background in the target color.
Abstract:
This invention relates generally to document protection methods and product. More specifically, the present invention relates to a method for hiding information in a document by means of a latent image or message, which is practically invisible to the naked eye and may only be revealed through use of a matching viewing device. The present invention further relates to a method for creating original documents containing latent messages, which are revealed when the document is read by a viewing device. In one embodiment, print elements such as lines, dots, spots, swirls, or images are used to form covert information. The covert information print elements are disposed at an angle to print elements of a background, thus creating a covert document. In another embodiment, print elements of the covert information are used with a solid background.
Abstract:
A light source is configured to emit narrow peaks at discrete spectral bands, especially primary color wavelengths, added to simulate the effect of a broadband light source. A subject is provided with a pigment, examples being certain rare earth lanthanides, with a strong absorption peak at a corresponding narrow spectral band. The pigment has a nominal hue under true broadband light. When illuminated by the narrow band source, the absorption peak eliminates the contribution of one of the primary colors, producing a distinct shift in hue of the pigmented subject. The change in hue cannot be anticipated from the appearance of illuminated subjects that lack the pigment, which remain normal. The narrow absorption peak is not noticeable under unmatched light sources or true broadband light sources, e.g., sunlight. The hue shift effect is useful for security authentication, informational and decorative applications.