Showing papers on "Color correction published in 1980"

Method for automatically determining reproduction picture color control conditions

Abstract: A method for automatically determining the color control conditions such as a highlight point, shadow point, a gradation control, color correction, and so forth, for a picture reproduction for use in a picture reproducing machine such as a color scanner and a color facsimile, wherein an original picture is scanned photoelectrically to pick up color separation picture signal data of the primary colors. The signal data is classified into groups to obtain a distribution condition, and according to the distribution condition obtained the color control conditions are determined.

Color correction monitoring system

Abstract: In a color printer system, a color film is checked and necessary color correction information is input into a recording medium before the color prints are made from the color film The color film is first automatically analyzed and automatically corrected The conditions of correction automatically obtained by the automatic color film analyzer are used for correcting color images The color images with the automatically obtained correction conditions are displayed on a color video monitor A human monitor observes the displayed images and determines whether or not additional corrections are necessary Further, the monitor determines whether or not the images should be printed due to extremely bad exposure conditions like badly blurred images The monitor inputs additional correction information and other necessary information to the analyzer The images are then further corrected according to the additional correction information and again displayed The printing process is performed after final check and correction by the human monitor

Digital color correction method

Abstract: A method for carrying out a color correction in a digital manner in a picture reproducing machine such as a color scanner, a color facsimile, or the like, which is capable of saving a large volume of capacity of a memory, wherein a resultant value obtained from a combination of color separation signals which are obtained by scanning photoelectrically a color original picture, is represented in a plane coordinate system, and wherein the coordinates of the resultant value are transformed in order to correct hue and saturation by operating the color separation signals together with factors predetermined, thereby obtaining a combination of color-corrected color separation signals.

Classifying and color correcting method of original color picture

Abstract: PURPOSE:To enable color prints of good color balances to be obtained by improving the detection accuracy of the original color images having been photographed under fluorescent light and obviating the occurrence of wrong recognition with the original color pictures belonging to other classifications. CONSTITUTION:The blue density, green density, large area mean transmission density and their hues at multiple measuring points obtained in a measuring part 10 are sent to a characteristic operating part 11, where the characteristic values such as the hues at the maximum density points, the area rates of the specific colors, the mean hues of the skin color under fluorescent light, etc. are calculated by using these. These characteristic values are sent to a judgement part 12, where they are compared with reference values. As a result, the discrimination of green color, yellow color, aging, etc. is accomplished with good accuracy and the original color pictures under fluorescent light are classified. The original color pictures under fluorescent light having been classified in this way are printed by using the high correction of the correcting keys 13 or the preset color keys for finishng the entire part to grey color and is thereby subjected to color correction and therefore the prints of good color balances may be obtained.

Apparatus for indicating overcorrections, in electrical color correction apparatus

Abstract: In a device for producing corrected color chromatic components for multicoloring printing in which an original is scanned and displayed on a color monitor in which different color components are supplied to comparators for each color channel and in the comparators the color signals are respectively compared with upper and lower thresholds such that the colors which exceed or fall below the threshold values are indicated so that color corrections may be made.

Color correction circuit for a color television receiver

Abstract: A color correction circuit is described for use in a color television receiver of the type which includes a B-Y demodulator and a network for sensing color-difference signals which are representative of hues within a selected range of fleshtones. In the preferred embodiment, the color correction circuit includes a voltage follower which is activated by the sensing network and which is coupled to opposite polarity outputs of the B-Y demodulator. When the network senses the presence of color-difference signals within the fleshtone range, the voltage follower is activated to combine a portion of one B-Y color-difference signal with the opposite polarity color-difference signal so as to develop a resultant B-Y signal of a reduced amplitude. At the same time, an offset current is automatically added to the resultant B-Y signal for off-setting the hues associated with the latter signal toward the fleshtone axis.

Multicolor diffusion transfer products

Abstract: The sensitometric properties of multicolor diffusion transfer film units may be modified after the photosensitive element has been coated. Sensitometric modification is effected by a photoexposure through a layer of a color correction dye(s). In a preferred embodiment, the color correction dye(s) is bleachable and is contained in a layer over the image-receiving layer.

Dynamic enabling network for a color correction circuit

Abstract: A dynamic enabling network is described for turning off and on a color correction network in a color television receiver. The enabling network receives and combines selected color-difference signals which are superimposed on a D.C. bias level so as to generate a first control signal whose amplitude is near a maximum when the color-difference signals are representative of fleshtone hues. A second control signal, also derived from the selected color-difference signals, is a D.C. signal whose amplitude is a function of the D.C. bias level associated with the selected color-difference signals. Both control signals are applied to a comparator for turning on the color correction circuit only when the difference in amplitude between the two control signals is indicative of hues within a selected range of fleshtones.

Color correcting method of original color picture

Abstract: PURPOSE:To enable print photographs of good color balances to be obtained by accurately classifying original color pictures according to picture patterns and subjecting these to effective color correction. CONSTITUTION:The hues of the blue density, green density, red density, white density and large area mean transmission density at multiple measuring points obtained in a measuring part 10 are sent to a characteristic value operating part 11, where the characteristic values of the huses of the maximum density points, the area rates of the specific colors and their hues, etc. are calculated. These characteristic values are sent to a judgement part 12, where they are classified by picture patterns. To this end, the judgement part 12 is constituted by 9 kinds of judgement parts 12a thru 12i according to the picture patterns. The judgement information from this judgement part 12 is sent to a color correcting data determining part 13. Here, the color corrections for the original color images have been predetermined according to their classifications like Table 1, in accordance with which printing is accomplished. In this way, the color prints of good color balances according to the picture patterns of the original pictures may be obtained.

Method of color printing

Abstract: A method of providing full range color printing using duplicator technology is disclosed. The system utilizes subtractive color printing techniques, but avoids the necessity for color masking and generally eliminates color correction as well. Following exposure of multiple negatives to develop color separations, corresponding printing plates are prepared and developed. A proofing sequence is optional between the development of the negatives and the plates. The ultimate printing is achieved by feeding stock into a duplicator which carries each of the three basic negative complementary colors, in sequence; a "black" printer can also be used for a higher degree of contrast and tone.

Color image duplicator

Abstract: PURPOSE:To obtain color image duplication of high quality by adding a color correction operator consisting of an arbitray function generator, weighting adders and storage means of storing the weights thereof. CONSTITUTION:The inputs 201-203 of an operator 6 are converted to, for example, 9 pieces of function groups 611-619 by a function generator 60. These are defined as f1, f2...fj...f9. Linear adders 61-63 calculate sums of products by using the coefft. values respectively set beforehand in storage devices 64-66 with respect to 9 pieces of the inputs, and generate outputs 601-603, which are defined as y1, y2, y3 respectively. If the inputs 201-203 are defined as x1, x2, x3 respectively and the coeffts. of the devices 64-66 are a1j,-a3j respectively, yi is expressed by the equationI. A color recorder 3 is driven by the y1, y2, y3 and duplicated pictures are recorded in a recording medium 4. The function fj and the coefft. a1j are determined by the prescribed equation and method. Thereby, the color image duplication of high quality is obtained.

Electrophotographic reprographic apparatus

Abstract: A color copier (1) having high resolution projection optics (4) is modified to include low resolution (5) electrical color correction apparatus. A latent electrostatic image of an original is generated with conventional lamp (24) and lens (26) projection optics. This optical latent image is corrected for tone or color in real time by a parallel raster exposure arrangement. A raster input scanner (RIS) (8) generates electrical raster image signals representative of the original. A processor (9) converts electrical correction signals according to a prescribed scheme from the raster image signals. A raster output scanner (ROS) (10) generates a raster latent image generated in registration with the optical latent image in response to the electrical correction signals. The RIS uses charge coupled devices (CCD's) (31) to generate the electrical raster signals and the ROS uses a laser (46) and galvanometer (51) to generate the raster latent image.

Color correcting circuit

Abstract: PURPOSE:To make it possible to correct the color of only a desired color region independently by preventing color regions from overlapping with one another CONSTITUTION:A color region is divided into seven, and divided regions are prevented from overlapping with one another R, B and G signals from a camera are inputted to corresponding terminals respectively, and R and G signals and R and B signals have signal levels adjusted by corresponding variable resistances so that prescribed outputs can be obtained by corresponding adders 101 and 102 They are inputted to NAM circuit 104 and are subjected from the output of adder 103 by 105, and further, they are subjected to black and white clip 106 and are so controlled that correction signals may be fixed independently of chroma saturation of the object by white clip and are inputted to dual differential amplifiers 107 and 108, and a red chroma saturation and a red phase can by changed by the former and the latter respectively Other colors can be subjected to color correction independently in correspondence of their regions

Color correcting exposure control method in color copying machine and its apparatus

Abstract: PURPOSE:To readily and accurately perform desired color correction by performing the determination of color correction amount by the color and density to be corrected and performing the exposure of photosensitive material by a split exposure method. CONSTITUTION:Respective necessary split exposure times T1, T2, T3 are calculated automatically by a setter 12 simply by setting the required color correction amount in the form of two colors out of commonly used three kinds and their desired density values. Based on these calculated values, photosensitive material 1 is automatically exposed by the light source 3 alone at the split exposure time T1, in the state that a filter 50Y of the largest correction amount is superposed on the light source 3 at the split exposure time T2 and further in the state that the filters 50C and 50Y of the two colores to be corrected are superposed on the light source 3 at the split exposure time T3, respectively.

Color correction adapter for photographic enlargers

Abstract: Subtractive filters are moved into and outfrom the light path between a lamp and a supported color transparency in a color enlarger to provide three separate exposures for the colors red, green and blue. Operator setable means provides an exposure time for each color exposure based on the color density of a standardized transparency. Balance circuit adjusts the exposure time for each color exposure to compensate for differences in color density between the standardized transparency and a transparency from which a color print is to be made. The balance circuit includes a light intensity sensor between the transparency and the lens. Magenta and yellow filters are moved together into the light path to produce the color red. Yellow and cyan filters produce the color green. Cyan and magenta filters produce the color blue. At the end of the red exposure the cyan filter is moved back into the white light path before the yellow filter is withdrawn. At the end of the green exposure the yellow and cyan filters are delayed in the white light path until all white light has disappeared. A portion of the magenta filter is moved into the light path during the green exposure and a portion of the yellow filter is moved into the light path during the green exposure. This shutters off some of the light, permitting an increase in the exposure time for the colors green and blue.

Color correction operation method

Abstract: PURPOSE:To reduce 3-dimensional memory device unnecessary, by using a combination of 2 color separation signals as the address designation signal of a memory device. CONSTITUTION:Memories 7, 8, 9 having written numbers corresponding to a plurality of regions formed by dividing each plane BG, GR, RB ontained by dividing a plane coordinate system with each axis of B, G, R with segments of lines radiated from the intersecting point of axes B, G, R and concentric circles having this intersecting point as the common center; memory 12 with written gain coefficients capable of controlling color balance; memories 13-18 with written coefficient for controlling color saturation; minimum value selection circuit 1; data selection circuit 11; multipliers 19-23; etc. are connected. As a result, the input of ratio of each color separation signal designates one of the plurality of regions obtained by dividing the plane coordinate system and reads out various coefficients written in, in accordance with the designated region, operates these coefficients together with the corresponding color separation signal, and thus a color-corrected color separation signal is obtained.

10× Microscope objective

Abstract: A four component 10× microscope objective having a concavo-convex negative triplet as the third element providing sufficient color correction to permit classification as a semi-apochromatic objective is disclosed.

Color correcting device of camera

Abstract: PURPOSE:To correct colors at the photographing by disposing plural light sources of different hues in the camera and making auxiliary exposure of the light of the hue necessary for correction during exposure or at the timing before or after this with said light source. CONSTITUTION:Light from the subject is measured of its three color light components respectively by photo detectors 1, 2, 3 for red-, green- and blue colors. After the output signals of the detectors 1-3 are amplified 4-6, they are sent to a color correcting circuit 7, by which the color temperatures are calculated. The color temperatures indicate the distribution ratios of three color light, from which the deviations of the hues are known. The LEDs 8, 9, 10 which form red-, green- and blue colors corresponding to the color correction amounts for the color temperatures have been programed in a color correction operating circuit and these are operated together with the aperture information from an aperutre value setting part 14 and a film sensitivity setting part 15 in an arighmetic circuit 18 and the exposure time is calculated in an exposure time operating circuit 19, whereby a shutter 20 is controlled.

40x Microscope objective

Abstract: A five-component 40x microscope objective having a plano-convex positive doublet as the third element providing sufficient color correction to permit classification as a semi-apochromatic objective is disclosed.

Color correcting device in digital color tone control

Abstract: PURPOSE:To realise easy and accurate color correction, by indexing the memory table on the basis of the color discrimination data to divide the hue region by mutual comparison and necessary computation of color data, and reading out correction data. CONSTITUTION:Yellow, magenta and cyan color data Y2, M2, C2 of 8-bit or other plate making color digital signals by scanning of the original are compared in a coincidence detecting comparator parallel to the first color discriminating circuit 44, and magnitude comparators 52Y and 51Y, 52M and 51M, and 52C and 51C to generate rough color discriminating data g-l to divide the hue regions in six stages or so through OR gates 53Y-53C, inverters 54Y-54C, and AND gates 55-60. Upper digit 4-bit data Y2'... of data Y2... added to the second operating circuit 45 are processed in adding circuit 62 and others, thereby generating color discriminating data D. According to these data g-l and data D, when the memory is indexed, the color correcting data may be easily and accurately read out by digital processing without using switch elements or the like, so that the color may be corrected.