Abstract: A method of photographic printing including making a stepped exposure of a simulation of a properly exposed gray card for a film to be printed having particular D/log E characteristics, and the film-mask-colored element for film having a colored mask, for a number of different periods of time on at least one sheet of photographic paper having certain D/log E characteristics; processing each sheet of paper; comparing each such exposure step of a simulation of a properly exposed gray card to a gray reference to determine the proper exposure time from the step most closely approaching the gray reference; and measuring the intensity of the exposing light to obtain the proper intensity which, with the proper time, determines the exposure to be used to print all film having D/log E characteristics generally similar to the particular D/log E characteristics on paper having D/log E characteristics generally similar to the certain D/log E characteristics.

Abstract: A method of making a printing plate from a negative microphotographic film by means of enlarged photographic projection which comprises the steps of impressing a code for detecting the respective frames of the negative microphotographic film on the blank space of said frames; automatically detecting any desired one of the frames by reference to the code; projecting the image of the detected frame on a transparent film of high dimensional stability at the same rate of enlargement as applied in photographically projecting said image on a printing plate material; preparing a retouching mask film by forming on said transparent film an additional pattern or reverse pattern by reference to the projected image; and applying the retouching mask film thus prepared in addition to the enlarged image of the negative microphotographic film impressed on the printing plate material.

Abstract: A group of separate large-size color or black-and-white pictures to be recorded on a master as very finely-screened (e.g. 10 micrometer period) micropictures in a given format, such as microfiche, are first reduced to a continuous-tone first recording at an intermediate size on a medium, such as 70 millimeter film. Then a relatively fine-screened (e.g. 40 micrometer period), high-contrast second recording, made from the first recording by contact printing, is reduced to micropicture size in the given format.

Abstract: The device is housed in an enclosure impervious to light of a selected frequency spectrum. The housing contains a light source of the same frequency spectrum and a pair of translatable filter holders. Each of the filter holders contain different chromic absorption filters positioned in a side-by-side relationship in the direction of translation. The chromic absorption filters are arranged with a color filter on one end of the holder and its color filter complement on the other end. A second embodiment contains an achromic or neutral filter positioned between the complementary chromic filters. The filters of each holder have vertical alignment when one is superposed over the other. A mask is provided between the filter holding means for allowing light from the source to pass through an area equal to approximately the width of one chromic filter. Thus, this light is then directed toward a color positive for correct light balancing.

Abstract: Process for color-copying a colored original which involves the color selections of said original, characterized(a) by photocopying and developing each of said color selections with developers containing dyestuffs which are sublimable or vaporizable between 130 and 230.degree. C and which correspond to the photocopied color selection,(b) by transferring these copies successively by superposing its in registration onto an intermediary support, in order to reconstitute the inverse color image of the original, and(c) by righting said intermediate image by transferring in one heating-step on the final support and the color photocopies obtained by the process.

Abstract: The strip of originals to be copied is transported, prior to copying, through an evaluation station. There, the originals are evaluated with respect to density, color, copiability, or the like. A discrete strip-shaped information carrier is connected to the strip of originals and runs along the length of the strip of originals. The connection is effected either upstream of the evaluation station or at the evaluation station. Information derived from the evaluations performed at the evaluation station is entered upon the information carrier alongside the associated ones of the originals.

Abstract: An apparatus for making reproductions or negatives for plate making comprises a base frame, a vertical supporting post secured at its lower end to the base frame, a master copy holding frame spaced above the base frame and vertically movably supported on the supporting post, a light source on the master copy holding frame, a lens system on the underside of the master copy holding frame and a copy paper holding plate on the base plate. The light source, the lens system and the copy paper holding plate are so positioned relative to one another as to be aligned with the axis of light emitted by the light source. The master copy holding plate carries a movable plate which is horizontally movable both longitudinally and transversely of the master copy holding frame. A master film holding plate is adapted to support a plurality of master films thereon and be removably secured to the movable plate which is movable to position the master films selectively for exposure to the light.

Abstract: A light mixing device of optically clear light transmitting material where the various color components of light introduced in the input end of the device are efficiently mixed by internal reflection through the length of the mixer. The mixer may be either linear or curved and includes axially extending reflective surfaces internal of its outer periphery.

Abstract: A reprographic apparatus (and its use) including an optical system, comprising an objective lens, for forming on a surface an image of an original and a device for selectively enabling a right-way-round image or an inverted image of such original to be produced on such surface, the device comprising a prism and a mirror alternatively interposable in the light path of the optical system.

Abstract: A compact optical bench type unit for making selected color-component records of color transparencies for use in color printing comprises a light source with a rotary filter disc for directing a beam of selectively colored light through a light condenser which converges the beam through a color diapositive to be reproduced and into the objective of a camera. The condenser, possibly formed of Fresnel lenses, is of large dimensions to accommodate large diapositives, and the camera objective has a relatively short focal length. Chromatic aberration of the condenser is corrected by moving the light source in correspondence with rotation of the filter disc, or by selectively inserting correcting lenses in the beam.

Abstract: The strip of originals is transported through an evaluating station where the originals are evaluated with respect to density, color, copiability, or the like. Information indicative of the results of these evaluations is manually entered upon a strip-shaped first information carrier in spatial coordination with the originals of the strip. Thereafter, at another location, the information on the first information carrier is transferred to a second information carrier. The strip of evaluated originals is then transported to a copying apparatus and there copied in accordance with the information on the second information carrier. The strip of originals itself can be utilized as the second information carrier.

Abstract: A method of photographic printing comprising making at least one exposure of a simulation of a properly exposed neutral gray card for a film to be printed, having particular D/log E characteristics, and a film-mask-colored element for film having a colored mask, for at least one predetermined period of time on at least one sheet of photographic paper having certain D/log E characteristics; processing each sheet of paper; and comparing each such exposure of a simulation of a properly exposed gray card using color filters to determine the proper exposure time and color filtration to be used to print all films having D/log E characteristics generally similar to the particular D/log E characteristics on paper having D/log E characteristics generally similar to the certain D/log E characteristics.

Abstract: A photographed and developed panchromatic negative film is mounted on an enlarger. White light will, after passing through this panchromatic negative film, be mixed up uniformly in a diffuser. This mixed-up light will print on panchromatic paper each colored image of cyan, magenta and yellow through each color filter in a fixed grade density of red, green and blue-violet. Of these printed images the differences between an image at the least visible section and other images will be indicated as an unbalance in the three primary colors. Then, a color filter for color correction corresponding to this unbalance will be selected. Next, removing the diffuser from the enlarger, alternatively the selected color correction filter will be mounted thereon. Again, when a panchromatic negative film is printed on panchromatic paper, a positive picture that will balanced in the three primary colors can be obtained.

Abstract: A novel device for use as an additive lamphouse in contact printing. White light is emitted by a source, collimated and then passed through a dispersion element to form a spectrum. The light is then selectively attenuated by wavelength to allow exact control of the color mixture of the light which falls on the negative and the positive contact. The use of a dispersion element rather than the dichroic principle of the prior art allows selective control of the color mixture of the light incident to the negative and thus to the contact by providing an improved control of the homogenuity of the color across the illuminated field. Also the problem of "color wedging" has been markedly reduced. The contact printer according to the present invention is more compact than those of the prior art and may be produced at a reduced cost.

Abstract: Apparatus for use in the production of a colored photographic reproduction of a black and white negative which consists essentially of a light-free enclosure, a baffle having an aperture and extending across the housing with means to mount the black and white negative over the aperture, means to carry one or more colored filters and means to generate a pulse of light to illuminate the negative in order that a copy may be taken by a camera suitably mounted.

Abstract: A half-tone screen in which a first and second set of grooves are inscribed in a transparent member. The grooves are arranged in a repetitive pattern with each groove from the first set being interposed between adjacent grooves of the second set, and the width of each groove of the first set being greater than the width of each groove of the second set.

Abstract: An optical magnifying device employing fiber optics. When functioning as a microscope, the object plane is defined by and divided into sub-areas by the input termini of many coherent fiber bundles. Each output terminal of each bundle is provided with an objective lens which projects onto an image plane. When used as a microfiche reader, a first magnifying stage is provided, and this (first) image is in turn further magnified in the same manner. Microfiche characters of 2 micron size may be resolved by the entire system.

Abstract: Apparatus for selectively inserting into and withdrawing color absorption filters from the light beam paths or photographic color recorders, e.g., of the aerial image and enlarger types. Includes a housing defining a pluralsection chamber and having opposed and spaced sidewalls with the latter in an operational section of the chamber having substantially aligned windows closed by suitable optical transparencies through which the light beam path of a photographic color recorder may extend upon suitable beam-intercepting support of this housing in a certain orientation. A plurality of substantially parallel, planar color absorption filters, having substantially uniform indices of refraction, are arranged in three different groups within a storage section of the chamber that is offset from the windowed operational section.

Abstract: A blocking filter is used, in conjunction with the substractive filter method of copying photographic color images, to remove or substantially remove by greatly weakening wave lengths from the copying light in the range in which the filter characteristics of the blue and green color filters or the spectral sensitivity curves of photographic copying paper overlap each other, or more particularly in a 30 nm belt about a central wave length of approximately 500 nm.

Abstract: The invention provides a method of facilitating registration in photomechanical color printing which comprises the steps of1. providing a set of color separations with registration holes or slots or notches avoiding the image area,2. mounting one of the color separations in position according to a layout on a stable transparent assembly sheet or foil,3. electronically recording the positional co-ordinates of the color separation on the assembly foil using the registration holes,4. replacing the assembly foil of step (2) by a further stable transparent assembly foil, and5. mounting another of the color separations in position on the further assembly foil using the recorded positional co-ordinates of the first color separation to ensure subsequent registration of the color separations.

Abstract: Machine for color reprography includes an exposure device and a support for the original, movable relative to one another. The exposure device includes an objective so constructed as to concentrate the light reflected by the original onto a photosensitive surface, the sweeping of the original being achieved by virtue of a reciprocating movement of the exposure device relative to the support for the original. The exposure device comprises an assembly of optical filters located in superposed filter-holder slides which are movable along a direction parallel to the sweeping movement, between two setting positions, one being a storage position not interposed in the light beam and the other being an operating position which cuts across this beam. The slides cooperate at one end of the sweep travel, with a stop device which pushes all the slides back into one of the setting positions. The stop device operates as a retainer which make it possible selectively to operate certain of the slides.

Abstract: An electrophotographic printing machine in which color transparencies are reproduced. The printing machine includes a notch filter which transmits blue and green light images of the color transparency therethrough while blocking a portion of the red light image from passing therethrough.

Abstract: Apparatus and method for making full color prints of a multicolor graphic original. The prints can be duplicates of the original or can be prints having colors for the various colors appearing in the original that have been synthesized to provide prints which are a "recoloring" of the original. The color data for synthesizing is stored in a permanent, machine readable form for later readout and use in controlling operation of the apparatus in order that the print from the original with synthesized colors can be easily reproduced without having to manually adjust controls for placing the necessary color data into the apparatus to obtain the desired "recolored" print.

Abstract: In the method of producing color slides from black and white originals, a light box, a glass plate and a camera are used. Also utilized is a positive and negative of a black and white original. In the first step, a film frame in the camera is exposed to the positive which is between the camera and the light box. Any desired background texture between the positive and the light box and a color filter on the camera lens may be used. In succeeding steps, the negative is used, mounted between the camera and the light box, and various portions of the negative are blacked out and different colored filters used while continuing to expose the film frame in the camera to various portions of the negative.

Abstract: Apparatus for optically imaging a halftone pattern on a xerographic photoreceptor to produce color copies of a color original. The apparatus includes a phase screen for providing a predetermined halftone pattern, the screen producing substantially the same pattern at the same spatial frequency over the visible light spectrum.

Abstract: An apparatus is disclosed for recording color separations on a photographic film band. The apparatus comprises a feed mechanism having a film transport member arranged to selectively bring portions of the unexposed film from a feed spool mounted in a housing into an operative position for exposure in a camera adapted to receive selective filters for color separation. The feed mechanism is arranged to unreel the unexposed film band under constant tension from the feed spool and to displace selected film portions in contact with a support surface whereby to selectively bring these film portions into their operative position for exposure in the camera and return them to said housing after exposure.

Abstract: An apparatus for color negative evaluation for use with a photo enlarger comprised of a filter and lens matrix board, and a frame for supporting the filter matrix and lens boards intermediate the photo enlarger holding the color negative being evaluated and a sheet of photosensitive paper whereby a plurality of images having colorations which depend on the individual filter elements are produced on the photosensitive paper. Further, a method comprised of the steps of exposing a color negative through a set of filter matrix boards having successively finer gradations such that an ultimate filter combination can be determined for making a final color balanced print.