Abstract:
An image correction method comprising the steps of: specifying a region including the face of one person in an image of people displayed in a screen of image display means in response to an input from an operator; extracting a correction target region including at least the face of the person in the image, based on information on at least one of hue, saturation, lightness, and a position of an outline of the specified region; setting a degree of correction to be carried out on each position in the correction target region in such a manner that the degree of correction becomes lower from the inside of the correction target region to the outside thereof near a boundary of the correction target region; and correcting at least one of hue, saturation and lightness in the correction target region based on the degree of correction.
Abstract:
A plurality of color patches whose colors differ stepwise are colorimetrically analyzed to determining a relationship between color signals and stimulus signals. A method of least squares is applied to the determined relationship to determine a relationship between first hypothetical color signals and first hypothetical stimulus signals. These relationships are established as a forward conversion table. Then, a first reverse conversion table is generated from the forward conversion table using the Newton's method. The relationship between the first hypothetical color signals and the first hypothetical stimulus signals in the first reverse conversion table is replaced with a relationship between second hypothetical color signals and second hypothetical stimulus signals which have a physically matching capability, thus generating a second reverse conversion table from the first reverse conversion table. The second reverse conversion table is mapped to produce a reverse conversion table which is used to convert stimulus signals into color signals.
Abstract:
There are disclosed a color correcting relation extracting method capable of extracting a know-how of a color correction by an operator of a laboratory system, and a color correction method of reproducing the know-how. A color of an original image and a color of a transfer image formed in a laboratory system with a color correction of the original image by an operator are measured so that an LUT representative of the know-how of the color correction is extracted and incorporated into a computer system.
Abstract:
A color transformation look-up table is provided, which is to be referred to when image signals for a non-self-luminous displaying medium are to be transformed into image signals for a self-luminous displaying medium such that appearances of perceived colors may become identical between images displayed on the two displaying media. The look-up table includes a function for transforming a dynamic range of the image signals for the non-self-luminous displaying medium into a dynamic range of the image signals for the self-luminous displaying medium such that a range of brightness of an image, which the non-self-luminous displaying medium can display, may become approximately identical with a range of brightness of an image, which the self-luminous displaying medium can display. The look-up table also includes a function for carrying out signal transformation in accordance with a chromatic adaptation model such that the appearances of perceived colors may become identical between the images displayed on the two displaying media.
Abstract:
There is produced a color correction definition for reproducing a suitable color correction common to a plurality of types of images. A color correction definition producing apparatus has a receiving section for receiving a plurality of LUTs (color correction definitions), a computing section for computing histograms used as an assembly of weight for sets of coordinate values constituting each of the LUTs, and a synthesizing section for synthesizing the plurality of LUTs received in the receiving section using the weight computed in the computing section.
Abstract:
There is implemented a profile producing high in general-purpose properties. A first patch group consisting of patches of which colors are relatively near the saturated color is disposed in front in read order determined beforehand, and a second patch group consisting of patches of which colors are relatively near neutral tints is disposed in the rear.
Abstract:
There are disclosed a profile producing method and a profile producing apparatus for producing a profile taking into consideration a performance of a device and a distortion of colors. A creation of a profile and a verification of a performance of a device are performed in accordance with read data in which a color chart, wherein the same gray patches are disposed at a plurality of places on a chart sheet and at the common places of a plurality of chart sheets, is read.
Abstract:
After the relationship between data of a second colorimetric system with respect to data of a first colorimetric system in a color reproduction range is determined as a conversion relationship, the data of the second colorimetric system at the boundary of the color reproduction range are set to data outside the color reproduction range. Using data CMY of the second colorimetric system at the boundary of the color reproduction range, data outside the color reproduction range are estimated according to a multiple regression analysis, thus generating a new conversion relationship. Using the new conversion relationship, data of the first colorimetric system are converted into data of the second colorimetric system, which are thereafter processed by gamut mapping within the color reproduction range.
Abstract:
Layout data are classified into character data, line image data, and gradation image data by an interpreter, and the line image data and the gradation image data are converted into data depending on printing conditions and output conditions of an output apparatus by a color conversion processor. The gradation image data are converted into data to which an image structure produced upon printing is imparted, by a halftone dot simulation processor. These data are converted into image data for scanning recording by a raster image processor, and outputted as a color proof image from the output apparatus.
Abstract:
An image correction method comprising the steps of: specifying a region including the face of one person in an image of people displayed in a screen of image display means in response to an input from an operator; extracting a correction target region including at least the face of the person in the image, based on information on at least one of hue, saturation, lightness, and a position of an outline of the specified region; setting a degree of correction to be carried out on each position in the correction target region in such a manner that the degree of correction becomes lower from the inside of the correction target region to the outside thereof near a boundary of the correction target region; and correcting at least one of hue, saturation and lightness in the correction target region based on the degree of correction.