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:
An electronic projector (beamer) is equipped with a profiling device (100) internally or externally connected thereto through standard interfaces. The profiling device includes all functionalities required for the color management (color measurement, calibration, profile generation, etc.) and corresponds with the projector (200) by way of a simple text based protocol. The latter can be implemented relatively easily by way of software in the projector, so that no changes to the fundamental concept of the projector are required. The profiling device can therefore on the one hand be easily integrated at the factory into existing projectors and on the other hand used as external complement to available projectors. The profiling device can however also be an independent device for the profiling of other electronic display devices (for example monitors) as well as for other, for example metrological tasks.
Abstract:
A colour measurement device includes a colour measurement channel (20,30) and a control (C), which forms colour measurement values from the measurement signals of the colour measurement channel and from stored white calibration data. It further includes correction means in order to calculate or correct the colour measurement values depending on different distances (a) and/or angles (α) to the measurement object. Because of the special measurement value correction, the colour measurement device is especially suited for contactless measurement applications with variable distances and angle orientations relative to the measurement object.
Abstract:
An illumination arrangement intended for use in a spectrophotometer is constructed as a linear array of light emitting diodes (11), whereby many individual light emitting diode chips are tightly packed along a small, narrowly defined straight or circular line and at least partially cast into a resin, in which at least regionally a converter material is included for the conversion of the light emitted by the light emitting diodes into other wavelength ranges. The light emitting diodes (11) have different spectral characteristics. UV light emitting regions and non-UV light emitting regions as well as regions covered with colour filters and/or polarization filters are provided. The illumination arrangement can include white emitting regions and narrow band emitting regions constructed especially for colour density measurement, whereby the narrow band regions can also be realized as narrow band converters. Ortho-silicate illuminants (BOSE) are preferably used as converter materials. The light emitting diodes (11) are preferably individually or groupwise selectively controllable. The illumination arrangement in accordance with the invention is clearly superior to conventional illumination arrangements with respect to performance, precision and universality of application.
Abstract:
During the processing of an order in a photographic printer, a developed copy film strip can be scanned negative by negative and point-by-point in a scanning station of the printer. From the scan signals, density values for exposure time determination in three partial colors and details on the image field number of the scanned negative can be obtained, and these data are stored in a memory, coordinating the determined three partial exposure times with the corresponding image number. All negatives of the copy film strip are exposed successively on photographic paper on an enlarged scale, using the determined exposure times. In a further step, a number of successive negatives of the film strip are exposed on full-scale or reduced scale in matrix form onto a single sheet of said photographic paper. The image field number associated with each negative is also exposed in matrix form on the single sheet and the exposure data stored from the initial scanning procedure are used as a basis for the exposure of the individual partial images. In addition to the exposures of the negatives, further data in connection with the film strip can also be exposed.
Abstract:
An exposure station for a photocopier includes an illumination device positioned above a transport plane for a copy original, with a lamp as the source of the copy light, and a focusing hood positioned in the light path of the lamp between the lamp and the copy original. A projection lens system is positioned between the transport plane of the copy original and a transport plane for the copy material for reproducing the copy original on the copy material. By adjusting the projection lens system, for example, by selecting different lenses, it is possible to set different enlargement sizes. The luminance conditions of the copy light falling on the copy original can be adjusted to the enlargement size that has been set.
Abstract:
In a photographic copying apparatus for processing exposed photographic film there are recorded in a measuring station, in addition to measurement data relating to the color composition of the negative, also splice events and perforation events and their occurrence on the film. The recorded data are fed to a calculating and evaluation unit and there stored in the form of a table (event table). The occurrence of splice events and perforation events on the film is recorded in one or more repositioning processing stations. Those data are stored in the calculating and evaluation unit in the form of a table (position table). In order to reposition the film in each processing station, the tables are correlated and any deviations established are taken into account when the film is repositioned. In order to detect the perforation and splice events, the measuring station (7) and the processing stations (8, 9) are equipped with perforation- and splice-detectors (72, 73 and 82, 83 and 92, 93, respectively).
Abstract:
A exposure control process and a photographic color copying apparatus make possible the optimal adaptation of the evaluation of a copy master to the varying spectral sensitivities of different copy materials, without having to change the measuring filters. The measuring light components of each of the basic colors are detected by a wavelength selective detection device in at least two closely adjacent spectral ranges and the resultant measured values combined into prevailing color extract values.