JP2000022978A - Color correcting device - Google Patents
Color correcting deviceInfo
- Publication number
- JP2000022978A JP2000022978A JP10201319A JP20131998A JP2000022978A JP 2000022978 A JP2000022978 A JP 2000022978A JP 10201319 A JP10201319 A JP 10201319A JP 20131998 A JP20131998 A JP 20131998A JP 2000022978 A JP2000022978 A JP 2000022978A
- Authority
- JP
- Japan
- Prior art keywords
- color
- lightness
- brightness
- conversion
- hue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 61
- 238000007906 compression Methods 0.000 claims abstract description 36
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000003086 colorant Substances 0.000 claims description 12
- 238000012937 correction Methods 0.000 abstract description 25
- 238000010586 diagram Methods 0.000 description 9
- 101001106432 Homo sapiens Rod outer segment membrane protein 1 Proteins 0.000 description 3
- 102100021424 Rod outer segment membrane protein 1 Human genes 0.000 description 3
- 101150065817 ROM2 gene Proteins 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 101100316860 Autographa californica nuclear polyhedrosis virus DA18 gene Proteins 0.000 description 1
- 101150048609 RR21 gene Proteins 0.000 description 1
- 101100524639 Toxoplasma gondii ROM3 gene Proteins 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、入力カラー画像信
号を色再現範囲が制限された出力装置の制御信号に変換
する色補正装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color correction device for converting an input color image signal into a control signal for an output device having a limited color reproduction range.
【０００２】[0002]
【従来の技術】一般に、電子写真方式のプリンタ、イン
クジェットプリンタなどにおける色再現範囲は、テレビ
ジョンやＣＲＴディスプレイ等の色再現範囲に比べて狭
いため、従来より、入力カラー画像が有する色再現範囲
と出力装置の色再現範囲が異なる場合に対応する多くの
色補正方法が提案されてきた。例えば、特開平４−４０
０７２号公報には、均等色空間やＨＶＣ色空間（明度、
色相、彩度に関する情報からなる色空間）上で、出力先
の色再現範囲の外であるか否かを判定し、色再現範囲外
の場合、明度と色相が同じである彩度が最大の値に修正
して出力することを特徴とする色補正方式について記載
されている。また、特開昭６１−２８８６９０号公報で
は、入力系に対して出力系の色再現範囲が異なる場合、
色度図上の白色点を中心として色相を一定として、出力
系の色再現範囲外の点を色再現範囲内の点に圧縮写像す
ることを特徴とするカラー画像処理方法について記載さ
れている。2. Description of the Related Art Generally, the color reproduction range of an electrophotographic printer or an ink jet printer is narrower than the color reproduction range of a television or a CRT display. Many color correction methods have been proposed to cope with different color reproduction ranges of output devices. For example, Japanese Patent Laid-Open No. 4-40
No. 072 discloses a uniform color space and an HVC color space (lightness,
Color space consisting of information on hue and saturation), it is determined whether the color is outside the color gamut of the output destination. If the color gamut is out of the color gamut, the saturation with the same lightness and hue is the maximum. This document describes a color correction method characterized in that a value is corrected and output. In Japanese Patent Application Laid-Open No. 61-288690, when the color reproduction range of the output system differs from that of the input system,
A color image processing method is described in which a hue is fixed around a white point on a chromaticity diagram and points outside the color reproduction range of the output system are compressed and mapped to points within the color reproduction range.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記のような
従来技術においては、まず、特開平４−４００７２号公
報記載のように、均等色空間等で、色再現範囲が制限さ
れた出力装置の制御信号に変換するために色相や明度を
保ちながら彩度を圧縮する場合、例えば、ＣＲＴモニタ
とハードコピーのように色再現範囲の大きさや形状が大
きく異なると、例えば、出力装置が再現できない明度の
低いの赤（Red ）や明度の高い青（Blue）等の色みがな
くなってしまう等の問題がある。また、特開昭６１−２
８８６９０号公報記載のように、明度や彩度を一律に白
色点等に向かって圧縮する手法や、色差最小方向に圧縮
する手法では、写真等の自然画像において、ある色に関
して、ハイライト部の彩度が高すぎてしまったり、高彩
度の潰れが生じたりする問題があった。本発明は、上記
のような従来技術の問題点を解決するためになされたも
のであり、請求項１においては、色再現範囲の大きさが
異なるカラー画像出力デバイス間の色変換において、高
彩度の潰れが少ない色再現範囲の対応付けを含む色補正
を実施することができる色補正装置を提供することを課
題とし、請求項２においては、色再現範囲の大きさや形
状が大きく異なるカラー画像出力デバイス間の色変換に
おいて、色再現範囲の好ましい対応付けを含む色補正を
実施することができる色補正装置を提供することを課題
としている。However, in the prior art as described above, first, as described in Japanese Patent Application Laid-Open No. 4-40072, an output device having a limited color reproduction range in a uniform color space or the like. When the saturation is compressed while maintaining the hue and brightness to convert to a control signal, for example, if the size or shape of the color gamut is significantly different from that of a CRT monitor and a hard copy, for example, the brightness that cannot be reproduced by the output device However, there are problems such as loss of color such as red (Red) with low brightness and blue (Blue) with high brightness. Also, Japanese Unexamined Patent Publication No.
As described in Japanese Patent No. 88690, in a method of uniformly compressing lightness or saturation toward a white point or the like, or in a method of compressing in a direction of minimum color difference, a natural image such as a photograph has a highlight portion for a certain color. There are problems that the saturation is too high or that the high saturation is lost. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art. In claim 1, in color conversion between color image output devices having different color reproduction ranges, high chroma It is an object of the present invention to provide a color correction device capable of performing color correction including association of a color reproduction range with less collapse, and a color image output device having a color reproduction range that differs greatly in size and shape. It is an object of the present invention to provide a color correction device capable of performing color correction including preferable association of a color reproduction range in color conversion between colors.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、請求項１記載の色補正装置は、任意のカラー画像出
力デバイスにおけるカラー画像情報を、色再現範囲が異
なる任意のカラー画像出力デバイスの制御信号に変換す
る色変換装置において、相対的に明度レンジを合わせる
明度変換処理を行う明度変換部と、明度変換処理を行っ
ても再現できない色に対して、カラーマッチングの目標
となる画像出力デバイスの色相毎の最高彩度に対応する
前記明度変換処理後の明度を基準として、明度に応じて
各色相毎に圧縮する方向を制御して色再現範囲内の色へ
圧縮する色変換部とを備えることで、高彩度の潰れが少
ない色再現範囲の対応付けを含む色補正を実施できるよ
うにした。また、請求項２記載の色補正装置は、任意の
カラー画像出力デバイスにおけるカラー画像情報を、色
再現範囲が異なる任意のカラー画像出力デバイスの制御
信号に変換する色変換装置において、相対的に明度レン
ジを合わせる明度変換処理を行う明度変換部と、明度変
換処理を行っても再現できない色に対して、カラーマッ
チングさせる双方の画像出力デバイスの色相毎の最高彩
度に対応する前記明度変換処理後の明度を基準として、
明度に応じて各色相毎に圧縮する方向を制御して色再現
範囲内の色へ圧縮する色変換部とを備えることで、色再
現範囲の好ましい対応付けを含む色補正を実施できるよ
うにした。According to a first aspect of the present invention, there is provided a color correction apparatus for converting color image information in an arbitrary color image output device into an arbitrary color image output device having a different color reproduction range. In a color conversion device that converts a control signal into a control signal, a brightness conversion unit that performs a brightness conversion process that relatively adjusts a brightness range, and an image output that is a target of color matching for a color that cannot be reproduced even by performing the brightness conversion process A color conversion unit configured to control a direction of compression for each hue according to the brightness and to compress the color within a color reproduction range based on the brightness after the brightness conversion process corresponding to the highest saturation for each hue of the device; The color correction including the association of the color reproduction range with less collapse of high saturation can be performed by providing. According to a second aspect of the present invention, there is provided a color conversion apparatus for converting color image information of an arbitrary color image output device into a control signal of an arbitrary color image output device having a different color reproduction range. A lightness conversion unit that performs lightness conversion processing for adjusting the range, and the lightness conversion processing that corresponds to the highest saturation for each hue of both image output devices that perform color matching for a color that cannot be reproduced even when the lightness conversion processing is performed. Based on the brightness of
A color conversion unit that controls the direction of compression for each hue in accordance with the lightness and compresses the color within the color reproduction range, so that color correction including a preferable association of the color reproduction range can be performed. .
【０００５】[0005]
【発明の実施の形態】以下、本発明の実施の形態を図面
を用いて具体的に説明する。図１は代表的な色空間であ
るＣＩＥＬＡＢ色空間を入力色空間とした場合の実施の
形態の説明図である。図示するように、ＣＩＥＬＡＢ色
空間を入力色空間とした場合、ＣＩＥＬＡＢ色空間を同
種類の立体図形（ここでは立方体）に分割する。そし
て、入力の座標（Ｌａｂ値）おける出力値Ｐを求めるに
は、前記入力の座標を含む立方体を選択し、該選択され
た立方体の８点の予め設定した頂点上の出力値と前記入
力の前記立方体の中における位置（各頂点からの距離）
に基づいて線形補間を実施する。ここで、入力値が４色
プリンタの制御信号である場合、出力値Ｐは、Ｃ、Ｍ、
Ｙ、Ｋ値にそれぞれ相当する。図２は本発明の第１の実
施の形態を示す色補正装置のブロック構成図である。図
２において、２０１はプリンタの色再現範囲データ（明
度Ｌ、色相Ｈに対する最大彩度Ｃ）を記憶した色再現範
囲記憶部（ＲＯＭ１）、２０２は入力色空間上の各頂点
に対応する出力装置の制御信号（Ｃ、Ｍ、Ｙ、Ｋ）を記
憶した頂点出力値記憶部（ＲＯＭ２）で、これらの色再
現範囲データと頂点出力値は、事前に決定して各記憶部
２０１、２０２に記憶させておく。２０３は補間処理部
であり、色補正実行時に、入力信号に基づいて、頂点出
力値記憶部２０２にあるプリンタの制御信号Ｃ、Ｍ、
Ｙ、Ｋを参照して、Ｃの補間演算を実施するＣ用処理部
２０４、Ｍの補間演算を実施するＭ用処理部２０５、Ｙ
の補間演算を実施するＹ用処理部２０６、Ｋの補間演算
を実施するＫ用処理部２０７とからなる。Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory diagram of an embodiment in which a CIELAB color space, which is a representative color space, is used as an input color space. As shown in the drawing, when the CIELAB color space is used as the input color space, the CIELAB color space is divided into three-dimensional figures (here, cubes) of the same type. Then, in order to obtain the output value P at the coordinates of the input (Lab value), a cube including the coordinates of the input is selected, and the output values on the preset vertices of eight points of the selected cube and the input values of the input are determined. Position in the cube (distance from each vertex)
Perform linear interpolation based on. Here, when the input value is a control signal of a four-color printer, the output value P is C, M,
They correspond to the Y and K values, respectively. FIG. 2 is a block diagram of the color correction apparatus according to the first embodiment of the present invention. In FIG. 2, reference numeral 201 denotes a color gamut storage unit (ROM1) storing color gamut data (maximum chroma C for lightness L and hue H) of the printer, and 202 denotes an output device corresponding to each vertex in the input color space. The color reproduction range data and the vertex output values are determined in advance in the vertex output value storage unit (ROM 2) storing the control signals (C, M, Y, K), and stored in the storage units 201 and 202. Let it be. Reference numeral 203 denotes an interpolation processing unit that controls the printer control signals C, M, and C stored in the vertex output value storage unit 202 based on an input signal when color correction is performed.
With reference to Y and K, a C processing unit 204 for performing C interpolation calculation, an M processing unit 205 for performing M interpolation calculation, Y
, And a K processing unit 207 for performing K interpolation calculation.
【０００６】また、２０８はプリンタの最大明度（紙の
色となる）及び最小明度に基づいて、入力画像信号の明
度成分（Ｌ* ）の圧縮処理を実施する明度変換（Ｌ圧
縮）部であり、２０９は相対的に明度レンジを合わせた
後、それでも再現できない色に対して色再現範囲内の色
へ圧縮処理を実施する色変換（圧縮）部であり、２１０
は、この色補正装置全体を制御するＣＰＵである。上記
のように構成された色補正装置は以下のように動作す
る。先ず、入力画像信号（本実施の形態ではＬａｂとす
る）は、明度変換（Ｌ圧縮）部２０８において、例え
ば、Ｌwhite 、Ｌblack をプリンタの最大明度（white
point ）及び最小明度（black point ）とした次式のよ
うな入力画像信号の明度成分（Ｌ* ）の圧縮処理を実施
する。 Ｌ* ＝Ｌ* ×（Ｌwhite −Ｌblack ）÷１００＋Ｌblack ただし、Ｌwhite ：プリンタの最大明度（white point ） Ｌblack ：プリンタの最小明度（black point ） ・・・（１） 本実施の形態例では、一例として、線形の圧縮を実施し
ているが、圧縮手段はこの限りではない。このようにし
て、明度変換（Ｌ圧縮）部２０８で明度圧縮された入力
画像信号の明度値（Ｌ* ）は、色度値（ａ* ｂ* ）と共
に色変換（圧縮）部２０９に送られ、以下のように明度
Ｌ、色相Ｈ、彩度Ｃの情報に変換される。 明度：Ｌ 彩度：Ｃ；（ａ2 十ｂ2 ）0.5 色相：Ｈ＝ａｔａｎ２（ｂ，ａ）×１８０／π ただし、ａ＝ｂ＝０のとき、Ｈ＝０、 Ｈ＜０のとき、Ｈ＝３６０十Ｈ ・・・（２） ここで、色変換（圧縮）部２０９は、この明度Ｌ、色相
Ｈ、彩度Ｃの情報と色再現範囲記憶部２０１（ＲＯＭ
１）にあるプリンタの色再現範囲データ（明度Ｌ、色相
Ｈに対する最大彩度Ｃ）を比較（同じ明度Ｌ、色相Ｈに
対する彩度Ｃの大きさを比較）して、入力データが色再
現範囲の内部にある場合は、そのまま補間演算部２０３
にデータ（Ｌ、ａ、ｂ）を送り、入力データが色再現範
囲の外部にある場合は、色相Ｈは保存したまま、カラー
マッチングの目標となる画像出力デバイス（例えばモニ
タ）の色相毎の最高彩度に対応する明度を基準とするＬ
変換後の明度Ｌ’に対応する前記プリンタの色再現範囲
データ（最高彩度Ｃ）を参照して、プリンタの色再現範
囲の色（ＬＨＣ→Ｌ’ａ’ｂ’）へ変更して、補間演算
部２０３にデータ（Ｌ’、ａ’、ｂ’）を送る。具体的
には、図３に示すように、色再現範囲外のデータは、
（各色相毎の）カラーマッチングの目標となる画像出力
デバイス（例えばモニタ）の最高彩度に対応する明度よ
り明度が高い色に対しては、色相一定で、明度が高くな
るに従い、色差最小の方向から明度一定の方向へ圧縮す
る方向を明度に応じて制御し、（各色相毎の）カラーマ
ッチングの目標となる画像出力デバイス（例えばモニ
タ）の最高彩度に対応する明度より明度が低い色に対し
ては、色相一定で、明度が低くなるに従い、色差最小の
方向から明度一定の方向へ圧縮する方向を明度に応じて
制御して、出力装置の色再現範囲の色へ圧縮することに
なる。Reference numeral 208 denotes a brightness conversion (L compression) unit for performing a compression process on a brightness component (L * ) of an input image signal based on the maximum brightness (the color of the paper) and the minimum brightness of the printer. , 209 are color conversion (compression) units that perform a compression process on colors that cannot be reproduced even after relatively adjusting the brightness range to colors within the color reproduction range.
Is a CPU for controlling the entire color correction apparatus. The color correction device configured as described above operates as follows. First, in the brightness conversion (L compression) unit 208, for example, Lwhite and Lblack are converted to the maximum brightness (white) of the input image signal (Lab in this embodiment).
point) and the minimum brightness (black point), the compression process of the brightness component (L * ) of the input image signal is performed as in the following equation. L * = L * × (Lwhite−Lblack) ÷ 100 + Lblack where Lwhite: maximum brightness of the printer (white point) Lblack: minimum brightness of the printer (black point) (1) In this embodiment, as an example, , Linear compression, but the compression means is not limited to this. In this way, the brightness value (L * ) of the input image signal that has been brightness-compressed by the brightness conversion (L compression) unit 208 is sent to the color conversion (compression) unit 209 together with the chromaticity value (a * b * ). Are converted into information of lightness L, hue H, and saturation C as follows. Lightness: L chroma: C; (a 2 tens b 2) 0.5 Hue: H = atan2 (b, a ) × 180 / π However, when a = b = 0, when H = 0, H <0, H = 360 × H (2) Here, the color conversion (compression) unit 209 stores the information of the lightness L, the hue H, and the saturation C and the color reproduction range storage unit 201 (ROM).
The color reproduction range data (maximum chroma C for lightness L and hue H) of the printer in 1) is compared (comparing the magnitude of chroma C for the same lightness L and hue H), and the input data is converted to the color reproduction range. , The interpolation calculation unit 203
(L, a, b), and if the input data is outside the color gamut, the hue H is preserved and the maximum for each hue of the image output device (eg, monitor) targeted for color matching L based on lightness corresponding to saturation
With reference to the color gamut data of the printer (highest chroma C) corresponding to the lightness L 'after the conversion, the color is changed to the color of the color gamut of the printer (LHC → L'a'b'), and interpolation is performed. The data (L ′, a ′, b ′) is sent to the arithmetic unit 203. Specifically, as shown in FIG. 3, data outside the color gamut is
For colors whose brightness is higher than the brightness corresponding to the highest saturation of the image output device (for example, monitor) which is the target of color matching (for each hue), the hue is constant and the color difference is minimized as the brightness increases. The direction of compression from the direction to the direction of constant lightness is controlled according to the lightness, and a color whose lightness is lower than the lightness corresponding to the highest chroma of the image output device (for example, monitor) which is the target of color matching (for each hue) In contrast, as the hue is constant and the lightness decreases, the direction in which the color difference is compressed from the minimum color difference direction to the constant lightness direction is controlled in accordance with the lightness to compress the color into the color within the color reproduction range of the output device. Become.
【０００７】上記の処理を式で表すと、以下のように表
すことができる。 Ｃ’＝gamut Ｃ（Ｈ、ＬK ） Ｌ＞ＬK （Ｌ Ｓmax ）のとき、 ＬK ＝ＬＥmin ＋（ＬＥmin −Ｌconst ）×（Ｌ−ＬＳ
max ）／（ＬＷ−ＬＳmax ） Ｌ＜ＬK （ＬＳmax ）の
とき、 ＬK ＝Ｌconst ＋（Ｌconst −ＬＥmin ）×（ＬＳmax
−Ｌ）／（ＬＳmax−ＬＢ） ただし、gamut Ｃ（Ｈ、Ｌ）は、任意の色相Ｈ、明度Ｌ
における出力装置（プリンタ）の色再現範囲（最高彩度
Ｃ） ＬＳmax ：カラーマッチングの目標となる画像出力デバ
イス（モニタ）の各色相の最局彩度に対応する明度Ｌ ＬＥmin ：入力と色差最小の出力装置（プリンタ）の色
再現範囲のＬ Ｌconst ：入力と明度一定の出力装置（プリンタ）の色
再現範囲のＬ（＝Ｌ） ＬＷ：出力装置（プリンタ）の最高明度 ＬＢ：出力装置（プリンタ）の最低明度 補間演算部２０３では、Ｃ用処理部２０４、Ｍ用処理部
２０５、Ｙ用処理部２０６、Ｋ用処理部２０７におい
て、頂点出力値記憶部（ＲＯＭ２）２０２にあるプリン
タの制御信号（頂点出力値）を参照した補間による変換
処理が実施され、出力装置へと転送される。尚、その
際、補間演算に使用される入力空間上の座標（Ｌ* ａ*
ｂ* ）には、実際の入出力（ＬＡＢ−ＣＭＹＫ）の関係
を測定して、このデータを使用して最小２乗法等により
算出したＬ* ａ* ｂ* 値に対するＣ、Ｍ、Ｙ、Ｋの値が
予め設定してある。The above processing can be expressed as follows by using an equation. C ′ = gamut C (H, L K ) When L> L K (L Smax), L K = LEmin + (LEmin−Lconst) × (L−LS
max) / time (LW-LSmax) L <L K (LSmax), L K = Lconst + (Lconst -LEmin) × (LSmax
−L) / (LSmax−LB) where gamut C (H, L) is an arbitrary hue H and lightness L
LSmax: Lightness L LEmin corresponding to the ultimate local saturation of each hue of an image output device (monitor) which is a target of color matching, and LLEmin: minimum input and color difference L Lconst of the color reproduction range of the output device (printer): L (= L) of the color reproduction range of the output device (printer) with constant input and brightness LW: Maximum brightness of the output device (printer) LB: Output device (printer) In the interpolation calculation unit 203, the processing unit for C 204, the processing unit for M 205, the processing unit for Y 206, and the processing unit for K 207 use the printer control signal (ROM 2) in the vertex output value storage unit (ROM 2) 202. The conversion process by interpolation with reference to the vertex output value) is performed and transferred to the output device. At this time, the coordinates (L * a *) on the input space used for the interpolation calculation
b * ), the actual input / output (LAB-CMYK) relationship is measured, and C, M, Y, K for the L * a * b * values calculated by the least square method using this data. Is set in advance.
【０００８】図４は本発明の第２の実施の形態を示す色
補正装置のブロック構成図である。図４において、４０
１はプリンタの色再現範囲デー夕（明度、色相に対する
最大彩度に対応するａ* ｂ* 値）を記憶した色再現範囲
記憶部（ＲＯＭ１）、４０２はプリンタの色相毎の最高
彩度に対応する明度を記憶した最高彩度（明度）記憶部
（ＲＯＭ２）、４０３は入力色空間上の各頂点に対応す
る出力装置の制御信号（Ｃ、Ｍ、Ｙ、Ｋ）を記憶した頂
点出力値記憶部（ＲＯＭ３）で、これらのデータは、事
前に決定して各記憶部４０１、４０２、４０３に記憶さ
せておく。４０４は補間処理部であり、色補正実行時
に、入力信号に基づいて、頂点出力値記憶部４０３にあ
るプリンタの制御信号Ｃ、Ｍ、Ｙ、Ｋを参照して、Ｃの
補間演算を実施するＣ用処理部４０５、Ｍの補間演算を
実施するＭ用処理部４０６、Ｙの補間演算を実施するＹ
用処理部４０７、Ｋの補間演算を実施するＫ用処理部４
０８とからなる。また、４０９はプリンタの最大明度
（紙の色となる）及び最小明度に基づいて、入力画像信
号の明度成分（Ｌ* ）の圧縮処理を実施する明度変換
（Ｌ圧縮）部で、４１０は、相対的に明度レンジを合わ
せた後、それでも再現できない色に対して色再現範囲内
の色へ圧縮処理を実施する色変換（圧縮）部であり、４
１１はこの色補正装置全体を制御するＣＰＵである。FIG. 4 is a block diagram showing a color correcting apparatus according to a second embodiment of the present invention. In FIG.
1 is a color gamut storage unit (ROM1) storing color gamut data of the printer (a * b * values corresponding to the maximum chroma with respect to lightness and hue); 402 is the highest chroma for each hue of the printer A maximum saturation (brightness) storage unit (ROM2) 403 for storing a brightness value to be output, and a vertex output value storage 403 for storing a control signal (C, M, Y, K) of an output device corresponding to each vertex in the input color space. These data are determined in advance in the storage unit (ROM 3) and stored in the storage units 401, 402, and 403. Reference numeral 404 denotes an interpolation processing unit which performs an interpolation calculation of C with reference to the control signals C, M, Y, and K of the printer stored in the vertex output value storage unit 403 based on the input signal when executing color correction. C processing unit 405, M processing unit 406 for performing M interpolation operation, Y for performing Y interpolation operation
Processing unit 407, K processing unit 4 for performing K interpolation calculation
08. Reference numeral 409 denotes a brightness conversion (L compression) unit that performs a compression process on the brightness component (L * ) of the input image signal based on the maximum brightness (the color of the paper) and the minimum brightness of the printer. A color conversion (compression) unit that performs a compression process on colors that cannot be reproduced even after relatively adjusting the brightness range to colors within the color reproduction range;
A CPU 11 controls the entire color correction apparatus.
【０００９】上記のように構成された色補正装置は以下
のように動作する。先ず、入力画像信号は、明度変換
（Ｌ圧縮）部４０９において、例えば、Ｌwhite 、Ｌbl
ack をプリンタの最大明度（white point ）及び最小明
度（black point）とした入力画像信号の明度成分（Ｌ*
）の圧縮処理を実施する（式１参照）。このようにし
て、明度変換（Ｌ圧縮）部４０９で明度圧縮された入力
画像信号の明度値（Ｌ* ）は、色度値（ａ* ｂ* ）と共
に色変換（圧縮）部４１０に送られ、明度Ｌ、色相Ｈ、
彩度Ｃの情報に変換される（式２参照）。ここで、色変
換（圧縮）部４１０は、この明度Ｌ、色相Ｈ、彩度Ｃの
情報と色再現範囲記憶部４０１（ＲＯＭ１）にあるプリ
ンタの色再現範囲データ（明度Ｌ、色相Ｈに対する最大
彩度Ｃ）とを比較（同じ明度Ｌ、色相Ｈに対する彩度Ｃ
の大きさを比較）して、入力データが色再現範囲の内部
にある場合は、そのまま補間演算部４０４にデータ
（Ｌ、ａ、ｂ）を送り、外部にある場合は、色相Ｈは保
存したまま、カラーマッチングさせるモニタとプリンタ
の色相毎の最高彩度に対応する明度（ＲＯＭ２に記憶）
を基準としたＬ変換後の明度Ｌ’に対応する前記プリン
タの色再現範囲データ（最高彩度Ｃ）を参照して、プリ
ンタの色再現範囲の色（ＬＨＣ→Ｌ’ａ’ｂ’）へ変更
して、補間演算部４０４にデータ（Ｌ’、ａ’、ｂ’）
を送る。The color correction device configured as described above operates as follows. First, an input image signal is subjected to, for example, Lwhite, Lbl in a brightness conversion (L compression) unit 409.
where ack is the maximum brightness (white point) and the minimum brightness (black point) of the printer, the brightness component (L * ) of the input image signal .
) Is performed (see Equation 1). In this way, the brightness value (L * ) of the input image signal which has been brightness-compressed by the brightness conversion (L compression) unit 409 is sent to the color conversion (compression) unit 410 together with the chromaticity value (a * b * ). , Lightness L, hue H,
It is converted into information on the saturation C (see Equation 2). Here, the color conversion (compression) unit 410 outputs the information of the lightness L, the hue H, and the saturation C and the color reproduction range data of the printer (the maximum value for the lightness L and the hue H) stored in the color reproduction range storage unit 401 (ROM1). (Saturation C) (saturation C for the same lightness L and hue H)
Are compared, and if the input data is within the color reproduction range, the data (L, a, b) is sent to the interpolation calculation unit 404 as it is, and if it is outside, the hue H is stored. The brightness corresponding to the maximum chroma for each hue of the monitor and printer to be color-matched (stored in ROM2)
With reference to the color gamut data (maximum chroma C) of the printer corresponding to the lightness L ′ after the L conversion based on, the color in the color gamut of the printer (LHC → L′ a′b ′) Then, change the data (L ', a', b ') to the interpolation calculation unit 404.
Send.
【００１０】具体的には、図５に示すように、色再現範
囲外のデータは、モニタの色相毎の最高彩度に対応する
明度（モニタＬ＞プリンタＬの場合）より明度が高い色
に対しては、色相一定で、明度が高くなるに従い、色差
最小の方向から明度一定の方向へ圧縮する方向を明度に
広じて制御し、（各色相毎の）プリンタの最高彩度に対
応する明度（モニタＬ＞プリンタＬの場合）より明度が
低い色に対しては、色相一定で、明度が低くなるに従
い、色差最少の方向から明度一定の方向へ圧縮する方向
を明度に応じて制御して、出力装置の色再現範囲の色へ
圧縮することになる。上記の処理を式で表すと、以下の
ように表すことができる。 Ｃ’＝gamut Ｃ（Ｈ、ＬK ） （ＬＳmon ＞Ｌ−Ｓprint の場合） Ｌ＞ＬＳmon のとき、 ＬK ＝ＬＥmin ＋（ＬＥmin −Ｌconst ）×（Ｌ−ＬＳmon ）／（ＬＷ−ＬＳ mon ）ＬＳprint ＜Ｌ＜ＬＳmon のとき、 ＬK ＝ＬＥmin Ｌ＜ＬＳprint のとき、 ＬK ＝Ｌconst ＋（Ｌconst −ＬＥmin ）×（ＬＳprint −Ｌ）／（ＬＳprin t −ＬＢ） （ＬＳmon ＜ＬＳprint の場合） Ｌ＞ＬＳprint のとき、 ＬK ＝ＬＥmin ＋（ＬＥmin −Ｌconst ）Ｘ（Ｌ−ＬＳprint ）／（ＬＷ−Ｌ Ｓprint ） ＬＳmon ＜Ｌ＜Ｌ−Ｓprint のとき、 ＬK ＝ＬＥmin Ｌ＜ＬＳmon のとき、 ＬK ＝Ｌconst ＋（Ｌconst −ＬＥmin ）×（ＬＳmon −Ｌ）／（ＬＳmon − ＬＢ） ただし、gamut Ｃ（Ｈ、Ｌ）は、任意の色相Ｈ、明度Ｌにおける出力装置（プ リンタ）の色再現範囲（最高彩度Ｃ） ＬＳmon ：モニタの各色相の最高彩度に 対応する明度Ｌ ＬＳprint ：プリンタの各色相の最高彩度に対応する明度Ｌ ＬＥmin ：入力と色華最小の出力装置（プリンタ）の色再現範囲のＬ Ｌconst ：入力と明度一定の出力装置（プリンタ）の色再現範囲のＬ（＝Ｌ） ＬＷ：出力装置（プリンタ）の最高明度 ＬＢ：出力装置（プリンタ）の最低明度 ・・・（５） 補間演算部４０４では、Ｃ用処理部４０５、Ｍ用処理部
４０６、Ｙ用処理部４０７、Ｋ用処理部４０９におい
て、頂点出力値記憶部（ＲＯＭ３）４０３にあるプリン
タの制御信号（頂点出力値）を参照した補間による変換
処理が実施され、出力装置へと転送される。More specifically, as shown in FIG. 5, data outside the color reproduction range is converted into a color having a lightness higher than the lightness corresponding to the maximum chroma for each hue of the monitor (when monitor L> printer L). On the other hand, as the hue is constant and the lightness increases, the direction of compression from the direction of minimum color difference to the direction of constant lightness is controlled by spreading the lightness to correspond to the maximum chroma of the printer (for each hue). For colors whose brightness is lower than the brightness (in the case of monitor L> printer L), the hue is constant, and as the brightness decreases, the direction of compression from the direction of the smallest color difference to the direction of constant brightness is controlled according to the brightness. Thus, the image is compressed to a color within the color reproduction range of the output device. When the above processing is expressed by an equation, it can be expressed as follows. C ′ = gamut C (H, L K ) (when LSmon> L−Sprint) When L> LSmon, L K = LEmin + (LEmin−Lconst) × (L−LSmon) / (LW−LSmon) LSprint <L <when lsmon, when L K = LEmin L <LSprint, L K = Lconst + (Lconst -LEmin) × (LSprint -L) / (LSprin t -LB) ( for lSmon <LSprint) L> LSprint when, L K = LEmin + (LEmin -Lconst) X (L-LSprint) / (LW-L Sprint) lSmon < when L <LSprint, when L K = LEmin L <lSmon, L K = Lconst + (Lconst−LEmin) × (LSmon−L) / (LSmon−LB) where gamut C (H, L) is the color reproduction range (maximum color) of the output device (printer) at an arbitrary hue H and lightness L Degree C) LSmon: the highest saturation of each hue of the monitor Corresponding lightness L LSprint: Lightness L LEmin corresponding to the maximum chroma of each hue of the printer L Lconst of the color reproduction range of the output device (printer) with minimum input and color difference: Output device (printer) with constant input and brightness L (= L) of the color reproduction range LW: maximum brightness of the output device (printer) LB: minimum brightness of the output device (printer) (5) In the interpolation operation unit 404, the processing unit 405 for C and the processing unit M for M In the processing unit 406, the processing unit 407 for Y, and the processing unit 409 for K, conversion processing by interpolation is performed by referring to the control signal (vertex output value) of the printer stored in the vertex output value storage unit (ROM3) 403, and the output device Is forwarded to.
【００１１】[0011]
【発明の効果】以上説明したように、本発明は以下のよ
うな優れた効果を奏する。請求項１記載の発明に係る色
補正装置によれば、色再現範囲の大きさが異なるカラー
画像出力デバイス間においてカラーマッチングをとるべ
く制御信号を変換する色変換装置において、相対的に明
度レンジを合わせる明度変換処理と、明度変換処理を行
っても再現できない色に対して、カラーマッチングの目
標となる画像出力デバイスの色相毎の最高彩度に対応す
る明度変換処理後の明度を基準として、明度に応じて各
色相毎に圧縮する方向を制御して色再現範囲内の色へ圧
縮する色変換処理とを行うように構成したので、カラー
マッチングの目標となる画像出力デバイスの特性に対応
した高彩度の潰れが少ない色再現範囲の対応付けを含む
色補正が可能となる。請求項２記載の発明に係る色補正
装置によれば、色再現範囲の大きさや形状が大きく異な
るカラー画像出力デバイス間においてカラーマッチング
をとるべく制御信号を変換する色変換装置において、相
対的に明度レンジを合わせる明度変換処理と、明度変換
処理を行っても再現できない色に対して、カラーマッチ
ングさせる双方の画像出力デバイスの色相毎の最高彩度
に対応する明度変換処理後の明度を基準として、明度に
応じて各色相毎に圧縮する方向を制御して色再現範囲内
の色へ圧縮する色変換処理とを行うように構成したの
で、色再現範囲の好ましい対応付けを含む色補正が可能
となる。As described above, the present invention has the following excellent effects. According to the color correction device of the first aspect of the present invention, in a color conversion device for converting a control signal so as to perform color matching between color image output devices having different color reproduction ranges, a lightness range is relatively set. For the brightness conversion process to match and the color that cannot be reproduced even after performing the brightness conversion process, the brightness based on the brightness after the brightness conversion process corresponding to the maximum saturation for each hue of the image output device that is the target of color matching Color conversion processing to control the direction of compression for each hue according to the color, and to perform compression to colors within the color reproduction range, so that high saturation corresponding to the characteristics of the image output device that is the target of color matching The color correction including the association of the color reproduction range with less collapse is possible. According to the color correction device of the second aspect of the present invention, in a color conversion device for converting a control signal to perform color matching between color image output devices having greatly different sizes and shapes of color reproduction ranges, The brightness conversion process that adjusts the range, and for colors that cannot be reproduced even after performing the brightness conversion process, based on the brightness after the brightness conversion process corresponding to the highest saturation for each hue of both image output devices to be color-matched, The color conversion process for controlling the compression direction for each hue in accordance with the lightness and performing compression to colors within the color reproduction range is performed, so that color correction including preferable association of the color reproduction range can be performed. Become.
【図１】ＣＩＥＬＡＢ色空間を入力色空間とした場合の
実施の形態の説明図である。FIG. 1 is an explanatory diagram of an embodiment in which a CIELAB color space is used as an input color space.
【図２】本発明の第１の実施の形態を示す色補正装置の
ブロック構成図である。FIG. 2 is a block configuration diagram of a color correction device according to the first embodiment of the present invention.
【図３】本発明の第１の実施の形態の説明図である。FIG. 3 is an explanatory diagram of the first embodiment of the present invention.
【図４】本発明の第２の実施の形態を示す色補正装置の
ブロック構成図である。FIG. 4 is a block diagram of a color correction device according to a second embodiment of the present invention.
【図５】本発明の第２の実施の形態の説明図である。FIG. 5 is an explanatory diagram of a second embodiment of the present invention.
２０１：色再現範囲記憶部、２０２：頂点出力値記憶
部、２０３：補間処理部、２０４：Ｃ用処理部、２０
５：Ｍ用処理部、２０６：Ｙ用処理部、２０７：Ｋ用処
理部、２０８：明度変換（Ｌ圧縮）部、２０９：色変換
（圧縮）部、２１０：ＣＰＵ、４０１：色再現範囲記憶
部、４０２；最高彩度（明度）記憶部、４０３：：頂点
出力値記憶部、４０４：補間処理部、４０５：Ｃ用処理
部、４０６：Ｍ用処理部、４０７：Ｙ用処理部、４０
８：Ｋ用処理部、４０９：明度変換（Ｌ圧縮）部、４１
０：色変換（圧縮）部、４１１：ＣＰＵ。201: color reproduction range storage unit, 202: vertex output value storage unit, 203: interpolation processing unit, 204: processing unit for C, 20
5: M processing unit, 206: Y processing unit, 207: K processing unit, 208: brightness conversion (L compression) unit, 209: color conversion (compression) unit, 210: CPU, 401: color reproduction range storage Section, 402; maximum saturation (brightness) storage section, 403: vertex output value storage section, 404: interpolation processing section, 405: processing section for C, 406: processing section for M, 407: processing section for Y, 40
8: K processing unit, 409: brightness conversion (L compression) unit, 41
0: color conversion (compression) unit, 411: CPU.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5B057 AA11 CA01 CB01 CD06 CE17 CE18 DA16 DB06 5C077 LL19 MP08 PP31 PP33 PP35 PP36 PP37 PP43 PQ20 RR21 SS02 SS06 TT02 5C079 HA17 HB03 HB06 HB08 HB11 LB01 LB02 LB11 MA01 MA17 NA03 PA03 PA05 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B057 AA11 CA01 CB01 CD06 CE17 CE18 DA16 DB06 5C077 LL19 MP08 PP31 PP33 PP35 PP36 PP37 PP43 PQ20 RR21 SS02 SS06 TT02 5C079 HA17 HB03 HB06 HB08 HB11 LB01 PA03 MA03 PA03
Claims (2)
カラー画像情報を、色再現範囲が異なる任意のカラー画
像出力デバイスの制御信号に変換する色変換装置におい
て、相対的に明度レンジを合わせる明度変換処理を行う
明度変換部と、明度変換処理を行っても再現できない色
に対して、カラーマッチングの目標となる画像出力デバ
イスの色相毎の最高彩度に対応する前記明度変換処理後
の明度を基準として、明度に応じて各色相毎に圧縮する
方向を制御して色再現範囲内の色へ圧縮する色変換部と
を備えたことを特徴とする色補正装置。1. A color conversion apparatus for converting color image information in an arbitrary color image output device into a control signal of an arbitrary color image output device having a different color reproduction range. For the brightness conversion unit to perform, for colors that cannot be reproduced even after performing the brightness conversion process, based on the brightness after the brightness conversion process corresponding to the highest saturation for each hue of the image output device that is the target of color matching, A color conversion unit comprising: a color conversion unit configured to control a compression direction for each hue according to lightness and compress the color in a color reproduction range.
カラー画像情報を、色再現範囲が異なる任意のカラー画
像出力デバイスの制御信号に変換する色変換装置におい
て、相対的に明度レンジを合わせる明度変換処理を行う
明度変換部と、明度変換処理を行っても再現できない色
に対して、カラーマッチングさせる双方の画像出力デバ
イスの色相毎の最高彩度に対応する前記明度変換処理後
の明度を基準として、明度に応じて各色相毎に圧縮する
方向を制御して色再現範囲内の色へ圧縮する色変換部と
を備えたことを特徴とする色補正装置。2. A color conversion apparatus for converting color image information of an arbitrary color image output device into a control signal of an arbitrary color image output device having a different color reproduction range, wherein a lightness conversion process for relatively adjusting a lightness range is performed. A lightness conversion unit that performs the lightness conversion based on the lightness after the lightness conversion processing, which corresponds to the maximum saturation for each hue of both image output devices that perform color matching for colors that cannot be reproduced even when the lightness conversion processing is performed. A color conversion unit for controlling a direction of compression for each hue according to the color conversion unit and compressing the color within a color reproduction range.
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|---|---|---|---|
| JP20131998A JP4046206B2 (en) | 1998-07-01 | 1998-07-01 | Color correction apparatus and color correction method |
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| JP4046206B2 JP4046206B2 (en) | 2008-02-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005048583A1 (en) * | 2003-11-14 | 2005-05-26 | Mitsubishi Denki Kabushiki Kaisha | Color correction device and color correction method |
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| JPS49109586U (en) * | 1973-01-11 | 1974-09-19 | ||
| JPS49104696A (en) * | 1973-02-06 | 1974-10-03 | ||
| JPS50147687U (en) * | 1974-05-23 | 1975-12-08 | ||
| JPS6244644A (en) * | 1985-08-23 | 1987-02-26 | Nippon Atom Ind Group Co Ltd | Sampling device |
| US5134879A (en) * | 1990-08-31 | 1992-08-04 | Union Oil Company Of California | Test method and apparatus |
| JPH05346379A (en) * | 1992-04-14 | 1993-12-27 | Hitachi Ltd | Ionic gas analyzer |
| US5375477A (en) * | 1993-01-04 | 1994-12-27 | S.P. Industries, Limited Partnership | Water impurity extraction device and method |
| US5456126A (en) * | 1994-03-21 | 1995-10-10 | Bellaire Industries, Inc. | Fluid valve and gas sample container using same |
| JP2004044644A (en) * | 2002-07-10 | 2004-02-12 | Nippon Pop Rivets & Fasteners Ltd | Screw grommet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005048583A1 (en) * | 2003-11-14 | 2005-05-26 | Mitsubishi Denki Kabushiki Kaisha | Color correction device and color correction method |
| US7599551B2 (en) | 2003-11-14 | 2009-10-06 | Mitsubishi Denki Kabushiki Kaisha | Color correction device and color correction method |
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| JP4046206B2 (en) | 2008-02-13 |
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