Abstract: A System and method for measuring the viscosity of printing ink during the printing and ink correction process is presented.

Abstract: A System and method for measuring the viscosity of printing ink during the printing and ink correction process is presented.

Abstract: A method of operating a printing press includes transferring ink from an inlet point to a printing substrate, and measuring actual optical values of light, in which the actual optical values are from light of selected wavelength ranges and in which the light has interacted with at least parts of the printed image. The method includes providing a control and evaluation device with measured values from an optical measuring device and with measured values from an ink mass determination device so as to determine an optical deviation of actual optical values from optical reference values, and determining an amount of corrective ink that is to be fed to the printing press in order to approximate the actual optical values to the optical reference values.

Abstract: The invention relates to a system and a method for controlling the composition of an ink mixture for at least one printing press, in which actual optical value of light are obtained, whereat the light has interacted at least with parts of the printing picture, which is generated by the printing press on the printing substrate using an ink mixture which is provided by an ink supply system and in which, due to the deviation of the actual optical value from optical reference values, a corrective ink mixture is created, which is added to the ink mixture which is provided by the ink supply system and which changes the ratio of the amounts of ink pigments therein, whereby first actual optical values are obtained inline, that is at running and just printed printing substrate, wherein these actual optical values are densitometrical values.

Abstract: A device for supporting a mobile calorimeter on a measuring object, especially a monitor, includes a flexible tube-shaped carrying belt (G) which is at least partially filled with a granular loading material and which is provided with a fixing member (1) for its installation on the calorimeter (MD). The supporting device may further include a pocket (T) provided with measuring and operating apertures for receiving the mobile calorimeter (MD), and the carrying belt (G) may be fastened to the pocket (T). The carrying belt (G) may be formed substantially as a closed loop and may be provided with a Velcro fastener for its lengthwise adjustment. The supporting device permits easy and comfortable positioning of the measuring apparatus on a monitor and at the same time serves as a carrying belt.

Abstract: To measure the colour of samples printed on a substrate containing brightener, a first spectral proportion of the total spectral reflection factor of the sample is measured by illuminating the sample with light having no UV element. From this first spectral proportion, a spectral correction factor is calculated making allowance for the characterisation data of the brightened substrate and the spectral properties of a selected type of illuminating light. The spectral correction factor is added to the first spectral proportion in order to obtain the total spectral reflection factor of the measured sample. The total spectral reflection factor is then evaluated for measuring and control purposes, in particular for calculating colour values of the sample. The characterising data of the substrate is determined on the basis of measurements taken with illuminating light with no UV element and with UV light only on a limited set of measurement samples, especially on the non-printed substrate only (paper whiteness).

Abstract: An illumination arrangement for a color measurement device includes a linear arrangement of light emitting diode chips (11) packed tightly along a narrowly defined path. A plurality of light emitting diode chips within at least one region of the path emit light of substantially the same color and are directly covered together with a resin in which a converter material is included for the conversion of the light emitted by the light emitting diode chips of the plurality thereof into at least one other wavelength range. An illumination light with cosine characteristic is emitted from a surface of the resin. UV light emitting regions and non-UV light emitting regions as well as regions including color filters and/or polarization filters may be provided. The illumination arrangement may include white emitting regions and narrow band emitting regions constructed especially for color density measurement.

Abstract: A color management system using distributed profiles includes a color printer adapted to print controlled color using a custom profile. The color printer system creates a custom profile by reading its initial characterization data, the profiles of the inks and the profile of the paper used in the printer. The color printing system includes a spectral measurement module adapted to generate spectral measurement of an output of the color printer. The printing system computes its initial characterization data by using the output of the color printer, measured by the spectral measurement module. The printing system updates the paper profile, the ink profile and/or the printer characterization data based on the measurement of the spectral measurement module.

Abstract: A method for the correction of measurement errors caused by surface effects induced by ink splitting during the color measurement of a printed sheet on a running printing device, includes scanning the printed sheet photoelectrically point by point and forming color and/or density measured values from scanning signals from the scanned points. Those scanned points which have a brightness exceeding a limiting value are identified, and the measured values are corrected by using the identified scanned points. In particular, during the formation of the color and/or density measured values, the scanning signals from the identified scanned points are not taken into account.

Abstract: A process for color quality assessment and color control in a color printing process is provided. The process utilizes a test element array including several test elements is co-reproduced with an image to be reproduced, whereby for the pixels of the image and the test elements of the test element array, color co-ordinate data are present in an original color space and for the test elements of the test element array the color values are present in an assessment color space are present. The co-reproduced test element array is colorimetrically measured with respect to the assessment color space, color difference of the test elements relative to the corresponding set color values are determined from the measured color values of the color elements and a color quality measure is calculated for the reproduced image and/or color correction quantities are calculated for the color reproduction process. The original color space (AFR) is divided into a larger number of color space areas.

Abstract: A scanner device includes a support surface for the measured object and a drive unit for moving a color measuring head across the support surface in at least one dimension thereof and for adjusting the height of the color measuring head in the direction perpendicular to the support surface, as well as a measuring and drive control unit activating the drive unit and cooperating with the color measuring head (MH). The color measuring head (MH) is equipped with at least an illuminating channel (IC) and a collection channel (CC). The illuminating channel (IC) has a light source (10) and optical means (12-22) for illuminating the measured object (S) at a measurement site at a mean angle of incidence of 45 E.

Abstract: A scanner device for measuring the color properties of a measured object pixel by pixel has a support surface for the measured object, a color measuring head, a drive unit for moving the color measuring head above the support surface in at least one dimension thereof and for adjusting the height of the color measuring head in the direction perpendicular to the support surface, as well as a measurement and drive control unit which activates the drive unit and co-operates with the color measuring head. It is also equipped with an electronic distance control system which adjusts the distance of the color measuring head above the measurement point in the direction perpendicular to the support surface to a desired measuring distance for every measurement point by means of the drive unit. The electronic distance control system works with measurement values generated by the color measuring head and distance values computed from them.

Abstract: A spectral photoelectric measurement transformer comprises an array (10) of photoelectric transformer elements and dielectric interference bandpass filters (22a, 22b) disposed on a common filter support (21) connected upstream of them for sensitizing the transformer elements to different wavelength ranges of the measurement light. The bandpass filters are divided into a number of filter groups, each of which contains the same different bandpass filters within the filter group. An optical deflector element (30) spectrally shifts the effective bandpass curves of the bandpass filters of all the filter groups except one so that the effective bandpass curves of all the bandpass filters have different spectral positions. As a result, a multiplication of the filter channels effectively made available can be achieved using only a few different bandpass filters. Due to the small number of different bandpass filters, the measurement transformer is inexpensive to manufacture.

Abstract: A spectral photometer intended for integration purposes includes a measurement head equipped with illumination arrangement including at least one light source for the illumination at an angle of incidence of 45° of a measured object and located in a measurement plane, a pickup arrangement for capturing the measurement light remitted by the measured object at an angle of reflection of essentially 0° relative to the perpendicular to the measurement plane, a spectrometer arrangement including an entry aperture for the spectral splitting of the measurement light captured and fed through the entry aperture, and a photoelectric receiver arrangement exposed to the split measurement light for conversion of the individual spectral components of the measurement light into corresponding electrical signals. It further includes an electronic circuit for control of the light source and forming digital measurement values from the electrical signals produced by the photoelectric receiver arrangement.

Abstract: A photoelectric color measuring head for measuring color properties of a measurement object includes an illumination device for exposing the measurement object to illuminating light and a wavelength-range-selective photoelectric receiver device (40) which intercepts measurement light remitted by the illuminated measurement object and converts it into corresponding electrical measurement signals. The illumination device includes an essentially white light-emitting diode (30) and means (60) for defining the angle of incidence range, so that the measurement object receives light only within an angle of incidence range, standardized for color measurement applications, of preferably 45°+/?5-10°. The receiver device includes a sensor field consisting of a multitude of photoelectric sensor pixels arranged in a line and the sensor pixels are made sensitive to different wavelength ranges through previously arranged color filters (420).

Abstract: An apparatus for the photoelectric measurement of an essentially planar measurement original includes a photoelectric scanner and a positioning arrangement for the two dimensional movement of the scanner over the measurement original positioned on a supporting surface and the positioning at defined measurement locations on the measurement original. The positioning arrangement is constructed as a type of SCARA robot and includes a stationary base, a first and a second movable robot arm and a positioning control. The first robot arm is mounted on the stationary base for rotation by a motor about a first axis of rotation perpendicular to the supporting surface. The second robot arm is mounted at the free end of the first robot arm for rotation by a motor about a second axis of rotation perpendicular to the supporting surface and carries the scanner, and the positioning control is constructed for rotation of the two robot arms according to externally supplied positioning commands.