JP2003153020A5 - Color processing method and equipment - Google Patents

Color processing method and equipment Download PDF

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JP2003153020A5
JP2003153020A5 JP2001346131A JP2001346131A JP2003153020A5 JP 2003153020 A5 JP2003153020 A5 JP 2003153020A5 JP 2001346131 A JP2001346131 A JP 2001346131A JP 2001346131 A JP2001346131 A JP 2001346131A JP 2003153020 A5 JP2003153020 A5 JP 2003153020A5
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Description

【０００１】
【発明の属する技術分野】
本発明は入力色データを出力色再現域内にマッピングするものに関する。 [0001]
[Technical field to which the invention belongs]
The present invention relates to mapping input color data within an output color reproduction range.

本発明は、入力色再現域と出力色再現域の共通領域に基づき設定された領域内の色は測色的に近似するようにカラーマッチングし、共通領域外の色は共通領域外の階調の損失を抑えるようにカラーマッチングすることで、良好な色再現を行うことを目的とする。 In the present invention, the colors in the area set based on the common area of the input color reproduction area and the output color reproduction area are color-matched so as to be colorimetrically similar, and the color outside the common area is the gradation outside the common area. The purpose is to achieve good color reproduction by color matching so as to suppress the loss of.

本発明にかかるカラー処理は、入力色データを出力色再現域内にマッピングするカラー処理方法であって、入力色再現域と出力色再現域の共通領域に基づき設定された第一の領域を取得し、入力色再現域内であって、第一の領域よりも外側に設定された第二の領域を取得し、入力色再現域内であって、前記第二の領域よりも外側に設定された第三の領域を取得し、第一の領域内の色データを測色的に一致するようにマッピングし、第二の領域内の色データを出力色再現域内であって第一の領域外である領域内にマッピングし、第三の領域内の、出力色再現域外である色データを出力色再現域の境界上にマッピングすることを特徴とする。 The color processing according to the present invention is a color processing method for mapping input color data within the output color reproduction area, and acquires a first area set based on a common area of the input color reproduction area and the output color reproduction area. , The third region within the input color reproduction region and set outside the first region is acquired, and within the input color reproduction region and outside the second region. The area of is acquired, the color data in the first area is mapped so as to match the color measurement, and the color data in the second area is in the output color reproduction area and outside the first area. It is characterized in that the color data in the third region, which is outside the output color reproduction region, is mapped on the boundary of the output color reproduction region.

【００８７】
【発明の効果】
本発明によれば、入力色再現域と出力色再現域の共通領域に基づき設定された領域内の色は測色的に近似するようにカラーマッチングし、共通領域外の色は共通領域外の階調の損失を抑えるようにカラーマッチングすることで、良好な色再現を行うことができる。 [0087]
【Effect of the invention】
According to the present invention, the colors in the area set based on the common area of the input color reproduction area and the output color reproduction area are color-matched so as to be colorimetrically similar, and the colors outside the common area are outside the common area. Good color reproduction can be achieved by color matching so as to suppress gradation loss.

Claims (9)

入力色データを出力色再現域内にマッピングするカラー処理方法であって、
入力色再現域と前記出力色再現域の共通領域に基づき設定された第一の領域を取得し、前記入力色再現域内であって、前記第一の領域よりも外側に設定された第二の領域を取得し、前記入力色再現域内であって、前記第二の領域よりも外側に設定された第三の領域を取得する領域取得工程と、
前記第一の領域内の色データを測色的に一致するようにマッピングし、前記第二の領域内の色データを前記出力色再現域内であって前記第一の領域外である領域内にマッピングし、前記第三の領域内の、前記出力色再現域外である色データを前記出力色再現域の境界上にマッピングするマッピング工程とを有することを特徴とするカラー処理方法。A color processing method for mapping input color data into an output color reproduction range,
A first area set based on a common area of the input color gamut and the output color gamut is acquired, and a second area is set within the input color gamut and outside the first area. An area acquisition step of acquiring a third area within the input color reproduction area and set outside the second area;
The color data in the first area is mapped so as to be colorimetrically matched, and the color data in the second area is within the output color reproduction area and outside the first area. And a mapping step of mapping and mapping color data outside the output color gamut within the third area onto a boundary of the output color gamut. 前記マッピング工程において、前記入力色データが前記第三の領域内である場合、前記入力色データを、色差が最小となるように前記出力色再現域の境界上にマッピングすることを特徴とする請求項1に記載されたカラー処理方法。  In the mapping step, when the input color data is in the third region, the input color data is mapped on a boundary of the output color reproduction region so that a color difference is minimized. Item 2. The color processing method according to Item 1. 前記マッピング工程において、前記入力色データが前記第二の領域内である場合、前記入力色データを、階調を保持するように、前記出力色再現域内であって、前記第一の領域外である領域内にマッピングすることを特徴とする請求項1に記載されたカラー処理方法。  In the mapping step, when the input color data is within the second region, the input color data is within the output color reproduction region so as to retain gradation, and outside the first region. 2. The color processing method according to claim 1, wherein mapping is performed in a certain area. 前記第一、第二および第三の領域の境界は、前記入力色再現域の境界と相似であることを特徴とする請求項1に記載されたカラー処理方法。  2. The color processing method according to claim 1, wherein a boundary between the first, second, and third regions is similar to a boundary between the input color reproduction regions. さらに、入力色再現範囲の明度範囲を出力色再現範囲の明度範囲に圧縮する明度範囲圧縮工程を有することを特徴とする請求項1に記載されたカラー処理方法。  2. The color processing method according to claim 1, further comprising a lightness range compression step of compressing the lightness range of the input color reproduction range to the lightness range of the output color reproduction range. さらに、ユーザの指示に基づき、前記第一の領域を変更する領域変更工程を有することを特徴とする請求項1に記載されたカラー処理方法。  2. The color processing method according to claim 1, further comprising an area changing step of changing the first area based on a user instruction. 入力色データを出力色再現域内にマッピングするカラー処理装置であって、
入力色再現領域と前記出力色再現域の共通領域に基づき設定された第一の領域を取得し、前記入力色再現域内であって、前記第一の領域よりも外側に設定された第二の領域を取得し、前記入力色再現域内であって、前記第二の領域よりも外側に設定された第三の領域を取得する領域取得手段と、
前記第一の領域内の色データを測色的に一致するようにマッピングし、前記第二の領域内の色データを、前記出力色再現域内であって前記第一の領域外である領域内にマッピングし、前記第三の領域内の、前記出力色再現域外である色データを前記出力色再現域の境界上にマッピングするマッピング手段とを有することを特徴とするカラー処理装置。A color processing device that maps input color data within an output color reproduction range,
A first area set based on a common area of the input color reproduction area and the output color reproduction area is acquired, and a second area is set within the input color reproduction area and outside the first area. An area acquisition means for acquiring an area and acquiring a third area within the input color reproduction area and set outside the second area;
The color data in the first area is mapped so as to be colorimetrically matched, and the color data in the second area is mapped within the output color reproduction area and outside the first area. And a mapping means for mapping color data in the third area outside the output color gamut onto the boundary of the output color gamut. 請求項1から請求項6の何れかに記載されたカラー処理をコンピュータに実施させることを特徴とするプログラム。  A program that causes a computer to perform the color processing according to any one of claims 1 to 6. 請求項8に記載されたプログラムが記録されたことを特徴とするコンピュータが読み取り可能な記録媒体。  9. A computer-readable recording medium on which the program according to claim 8 is recorded.
JP2001346131A 2001-11-12 2001-11-12 Color processor and method therefor Pending JP2003153020A (en)

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US7474438B2 (en) 2003-07-31 2009-01-06 Hewlett-Packard Development Company, L.P. Wide gamut mapping method and apparatus
JP4518280B2 (en) 2007-11-14 2010-08-04 富士ゼロックス株式会社 Color gamut forming device, color conversion device, color gamut forming program, color conversion program
JP5538743B2 (en) * 2009-04-15 2014-07-02 キヤノン株式会社 Image processing apparatus, image processing method, and program
JP5071532B2 (en) * 2010-07-09 2012-11-14 ブラザー工業株式会社 Scanner device
JP6171289B2 (en) * 2012-08-28 2017-08-02 株式会社リコー Image processing method, image processing apparatus, and program

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