Canon Kabushiki Kaisha

Toshiyuki Mizuno

Yoshinobu Shiraiwa

Yumiko Hidaka

Kazuo Minoura

Kazuo Isaka

Yumiko Ohsaki

An image processing method converts data dependent on a first illuminating light into data dependent on a second illuminating light by, storing conversion conditions for plural illuminating light sources of different color rendering properties, generating data indicating the proportion of synthesis of the stored conversion conditions of the plural light sources, corresponding to the second illuminating light, generating a first conversion condition from the stored conversion conditions for the plural illuminating light sources according to the data indicating the proportion of synthesis, generating a second conversion condition for color temperature conversion based on color temperature information from the second illuminating light, and converting data dependent on the first illuminating light into data dependent on the second illuminating light using the first and second conversion conditions.

Image processing apparatus and method for converting data dependent on a first illuminating light into data dependent on a second illuminating light

An image processing apparatus is constructed by a setting circuit for manually setting a first color processing parameter, a first color processing circuit for performing a first color process by using the first color processing parameter, a storing circuit for storing a second color processing parameter set in correspondence to the first color processing parameter as a reference value, and a second color processing circuit for performing a second color process different from the first color process by using the second color processing parameter, wherein in case of making the second color processing circuit function, the first color processing parameter is set to the reference value.

Objective automated color matching between input and output devices

An image processor performs color correction corresponding to an environment light. An input device inputs white information of a recording medium and environment light information, and a correction device performs correction corresponding to a fluorescent whitening effect, for the white information of the recording medium on the basis of the environment light information. A color correction device performs color correction for an input color image information on the basis of the corrected white information of the recording medium.

Image processing apparatus, image processing method, storage medium for storing image processing method, and environment light measurement apparatus

An image processing method in which color-appearance matching of an output image to an input image is achieved regardless of ambient light. Color conversion is performed on image data representing an input image to fulfil color-appearance matching of an output image to be reproduced by an image, output device, to the input image. Color conversion is performed on the image data representing the input image obtained from the input device under a certain standard light source into image data dependent on a light source used for observation. The converted image data is further subjected to color conversion based on a reference white color determined when an observation is made. The resultant image data is output to the image output device.

Image processing method and image processing apparatus

An image processor includes a determination unit which determines an adaptation ratio of a reference white color value with respect to at least two white color values. Also included are a calculation unit which calculates a reference white color value in accordance with the determined adaptation ratio, and a conversion unit which converts an image signal in accordance with the calculated reference white color value.

Image processing apparatus, method, and recording medium for performing color correction suitable for matching ambient light for different types of output devices

An image processing apparatus performs a conversion process according to observation environment light of an output image. The apparatus includes a conversion processor for performing a conversion process on image data, on the basis of light source information corresponding to the observation environment light of the output image. The apparatus has a first mode to perform the conversion process according to a plurality of light source information, and to output in parallel simultaneously the image data converted on the basis of the plurality of light source information, and a second mode to select desired light source information from among the plurality of light source information by an instruction of a user, and to perform the conversion process according to the selected light source information.

Image data conversion on the basis of observation light of an output image

Image processing apparatus and method for performing a color matching

Method and apparatus for forming halftone images which enables image recording on a process film without reducing the size of the recording area beyond that which is necessary. The method and apparatus is preferred particularly in the preparation of a master printing plate such as a printing plate which includes a photosensitive member having an organic silver salt. According to the method and apparatus, an image recording apparatus propagates error data when there exists a restriction on the minimum recording size and thereby preserves halftone concentration and reproduces intermediate gradation of darkness with stability.

Method and apparatus for forming halftone images on

A scanning optical apparatus is provided with a light source, a scanning device and a detector. A light beam generated from the light source is deflected by the scanning device to be scanned on a surface to be scanned. The light beam scanning on the surface to be scanned is detected by the detector. The detector is constructed such that three or more photosensors are closely arranged adjacent one another in the scanning direction. At least one of the photosensors is a division sensor which is arranged symmetrically with respect to the scanning direction.

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Yokohama, Japan

Toshiyuki Mizuno