JP3710423B2 - Color calibration method - Google Patents
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- JP3710423B2 JP3710423B2 JP2002031635A JP2002031635A JP3710423B2 JP 3710423 B2 JP3710423 B2 JP 3710423B2 JP 2002031635 A JP2002031635 A JP 2002031635A JP 2002031635 A JP2002031635 A JP 2002031635A JP 3710423 B2 JP3710423 B2 JP 3710423B2
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- 238000000034 method Methods 0.000 title claims description 19
- 239000003086 colorant Substances 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 2
- 235000019557 luminance Nutrition 0.000 description 37
- 230000000007 visual effect Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000009795 derivation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/465—Measurement of colour; Colour measuring devices, e.g. colorimeters taking into account the colour perception of the eye; using tristimulus detection
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Description
【０００１】
【発明の属する技術分野】
本発明は、コンピュータ同士の画像表示において提供者と利用者の間及び利用者間の視覚的な色の差を最小にする方法に関する。
【０００２】
【従来の技術】
インターネットにおける商取引等で、コンピュータ画面での色表現の忠実性が問題になっている。たとえばWWWを用いた通信販売では、クライアントの画面で見る商品と現実の商品とで色の見え方にかなりの違いがある。
【０００３】
現状の技術で正確な調整を行うには測定機器を用いた分光測光などの手法がある。この方法では絶対的な色調整が可能になる。
【０００４】
【発明が解決しようとする課題】
しかしながらディスプレイ装置の発色の調節には高価な装置を必要とする上、技術的に高度で複雑な操作を必要とする。
【０００５】
さらに、画像を作成する側と表示する側との間の相対的な発色の調整は行われないという問題がある。
【０００６】
また利用者個人の視覚特性は考慮されないため，色光の物理的な特性は同じであっても利用者間で色の見え方が異なるという問題がある。
【０００７】
【０００８】
本発明は、請求項１乃至３では画像を作成する側と表示する側に高価な装置を必要とせずに利用者の視覚的な色の差を，単に測定装置や経験豊富なオペレーターなどで補正可能な物理的な色の差にとどまらず個人間の視覚特性の違いに依存する色の差まで含めて，最小とすることが可能である。
【０００９】
【課題を解決するための手段】
請求項１記載の色キャリブレーション方法は、画像作成側で作成された画像を、インターネット等のネットワークを介して画像表示側で表示する場合の画像表示側での色を補正する色補正方法であって、前記画像作成側の画像表示装置に於ける測定された基本原色の輝度特性値から原色単独の最大輝度に対する第１比（ rvi ( kvi ) ）と、前記画像表示側の画像表示装置に於ける基本原色の輝度特性値から原色単独の最大輝度に対する第２比（ rui ( kui ) ）とを求めておき、前記画像作成側及び前記画像表示側に於ける任意の２つの原色が有する輝度を一致させ、該画像作成側の前記一致する場合に於ける任意の原色の信号値および他の特定の原色の信号値を測定して、任意の原色の第１比がとる値と他の特定の原色の第１比がとる値を算出して、前記任意の原色が有する最高輝度を基準として、前記他の特定の原色が有する最高輝度に対する第３比（ Rvi,p ）と、該画像作成側の前記一致する場合に於ける任意の原色の信号値および他の特定の原色の信号値を測定して、任意の原色の第２比がとる値と他の特定の原色の第２比がとる値を算出して、前記任意の原色が有する最高輝度を基準として、前記他の特定の原色が有する最高輝度に対する第４比（ Rui,p ）を算出し、前記画像作成側と前記画像表示側との間の輝度比を表現する第５比（ Q ）を算出し、前記画像作成側に於ける基本原色の信号の強度である第１信号強度（ kvi ）がある値であるときに、前記画像作成側の前記第１比、前記第３比、画像表示側からの前記第４比と前記第５比から、画像表示側に於ける基本原色の輝度特性値から原色単独の最大輝度に対する第２比（ rui ( kui ) ）が取るべき特定の値を算出し、その第２比（ rui ( kui ) ）に対応する第２信号強度（ kui ）を算出して、前記画像作成側から送信される信号値を、前記算出された前記第２比が取るべき特定の値に対応する画像表示側信号値に補正することを特徴とする。
図１は、本発明が行う色の補正の流れを示す。
【００１０】
請求項２記載の色キャリブレーション方法は、前記算出結果は、次式（数１）の条件を満たすように前記第２比が取るべき特定の値を算出する。
【００１１】
（数１）
rui ( kui ) ＝ rvi ( kvi ) × ( Rui,p ) ／ ( Rvi,o ) × Q
【００１２】
請求項３記載の色キャリブレーション方法は、任意の原色Ｃiの信号が有する最大値を( ki,max )とした場合に、前記画像作成側の信号が有する最大値に対する割合（ kvi ／ kvi,max ）と、前記画像表示側の信号が有する最大値に対する割合（ kui ／ kui,max )が近くなるように、前記第５比が選択されていることを特徴とする。
【００１３】
基本原色の輝度比の導出は、全ての定義された基本原色間を網羅するように２色ずつを選び、２色を比較し輝度が人間の視覚で一致するような信号値の測定結果を使用することを特徴とする。
【００１４】
２色の輝度比を測定する方法は既にいくつか存在し、HFP法あるいはモーションキャンセレーション法などが知られている。これらの手法を用いると、その測定方法が人間の目に頼って行うものであることから、利用者間の視覚特性の相違が自動的に測定値に含まれることになる。
【００１５】
「定義された基本原色」は，その表示システムで利用可能な３色以上の独立した色の組み合わせであって、原理的には任意の３色以上を選ぶことが出来る。画像の提供側と表示側で異なる基本原色である場合は、輝度値で定義された色空間の各色輝度データを表示側の基本原色の輝度データに変換する必要がある。この変換は任意の色空間で可能であるため、以下の説明では画像提供側と表示側が同じ基本原色を使用しているとして説明する。
【００１６】
基本原色をn色とし、それぞれをC1,C2,..,Cnとすると、色はこれら基本原色の輝度の強さの組み合わせで表される。基本原色Ciの信号の強さをki、それに対する輝度をLi(ki)とすると、色は(L1(k1),L2(k2),...,Ln(kn))と表すことができる。
【００１７】
基本原色Ciの最大輝度をLi,maxとすると（数２）のように表現できる。ここでri(ki)は各原色単独の最大輝度に対する比であり、０から１の間の値をとる。
（数２） Li(ki) ＝ ri(ki) × Li,max
このようにして、画像作成側の画像表示装置に於ける基本原色の信号の強度である第１信号強度（ kvi ）より，画像作成側の画像表示装置に於ける測定あるいは推定された基本原色の輝度特性値から原色単独の最大輝度に対する第１比（ rvi ( kvi ) ）を求める。このとき(数２)は次の式で表される。
Lvi(kvi) ＝ rvi(kvi) × Lvi,max
また同様に，画像表示側に於ける基本原色の信号の強度である第２信号強度（ kui ）より，画像表示側の画像表示装置に於ける測定あるいは推定された基本原色の輝度特性値から原色単独の最大輝度に対する第２比（ rui ( kui ) ）とを求める。このとき(数２)は次の式で表される（Ｓ１）。
Lui(kvi) ＝ rui(kui) × Lui,max
【００１８】
各原色単独の最大輝度に対する比ri(ki)（第１比（ rvi ( kvi ) ）および第２比（ rui ( kui ) ））は、各階調に対する輝度を測定する既存の方法を用いて導出する。この導出方法としては、ルックアップテーブル等にkiとri(ki)のデータを格納して利用することによって行われる。
【００１９】
そしてルックアップテーブル等を用いて、信号値（又は信号強度）kiからri(ki)、あるいは逆にri(ki)からkiを導くことができる。
尚、このようにルックアップテーブル等を用いることによって、表示側の第２比（ rui(kui) ）が取るべき特定の値が求まれば，その特定の値を作るのに必要な第２信号強度（ kui）値を、表示側の装置で使用することができる（例えば、図１で示される（Ｓ８）で使用することができる）。
【００２０】
２つの原色CaとCbの輝度が一致するように双方の信号を調整し、CaとCbの信号がそれぞれKa,b、Kb,aの時に輝度が一致したとする。Ra,b ＝ ra(Ka,b) ／ rb(Kb,a)と定義すると、（数３）のようになる。
（数３） Ra,b＝ra(Ka,b) ／ rb(Kb,a)＝Lb,max ／ La,max
（数３）より、仮に２つの原色CaとCbの輝度が一致するような測定を行っておらずとも、CaとCcの測定とCbとCcの測定の結果があれば、Ra,b = Ra,c ／ Rb,cという計算で求めることができる。このため２つの原色の輝度を一致させる測定は、全ての原色間を網羅する必要がある。
このようにして２つの原色の輝度が一致する場合に於ける、任意の原色が有する最高輝度を基準とする、他の特定の原色が有する最高輝度に対する第３比（Rvi,o）を算出する（Ｓ２）。
【００２１】
（数３）より画像提供側の任意の原色Ciの最大輝度Lvi,maxはある原色Coを最高輝度Lvo,maxを使って次の式で表される。
Lvi,max ＝ １ ／ Rvi,o × Lvo,max この式を（数２）に代入すると（数４）になる。
（数４） Lvi(kvi) ＝ rvi(kvi) ／ Rvi,o × Lvo,max
このようにして、第１比、第３比及び特定の原色が有する最高輝度から任意の原色が有する輝度を算出する（Ｓ３）。
【００２２】
画像表示側でも同様にある原色Cpの最高輝度等を用いて（数５）が成り立つ。
（数５） Lui(kui) ＝ rui(kui) ／ Rui,p × Lup,max
ここで、上記の方法（Ｓ２）を利用して、画像表示側に於ける任意の原色が有する表示側輝度に対する第４比（ Rui,p ）を算出する（Ｓ４）。
【００２３】
画像を構成する画素の画像提供側と表示側で対応する原色の輝度を比べたとき、その比が画素や原色の種類によらず一定であればそれは同じ色である。これを式で表すと（数６）になる。
（数６） Lui(kui) ＝ q × Lvi(kvi)
ただし、qはピクセルや色に因らない値である。
【００２４】
（数６）に（数４）と（数５）を代入し変形すると（数７）になる。
（数７） rui(kui) ＝ rvi(kvi) × Rui,p ／ Rvi,o × Q
ただし、Q ＝ Lvo,max ／ Lup,max × qである。
このようにして、画像作成側と表示側の間の輝度比がただ１つの値Ｑ（第５比）で表現されるようにする（上記の式 Q ＝ Lvo,max ／ Lup,max × q を利用する）（Ｓ５）。
【００２５】
（数７）のQ以外の項は画像表示前に計算できるため、結局任意の原色Ciに対する（数６）の右辺は、ある値Qを未知数として表現される。原色Ciの信号の最大値をki,maxとすると、画像提供側と表示側での信号の最大値に対する割合kvi ／ kvi,maxとkui ／ kui,maxが近くなるようにQを選ぶ。
つまり、上記の如く、原色Ciの信号の最大値を ki,maxとすると、画像提供側と表示側での信号の最大値に対する割合kvi／kvi,maxとkui／kui,maxが近くなるように第５比Qを選ぶ（Ｓ６）。
そして、画像作成側に於ける基本原色の信号の強度である第１信号強度（ kvi ）がある値であるときに、作成側の第３比（Rvi,o）と表示側の第４比(Rui,p)と第５比（Q）の３つの各比から、表示側の第２比（rui(kui)）が取るべき特定の値を（数７）を利用して計算する（Ｓ７）。
rui(kui)が取るべき特定の値が求まれば、ルックアップテーブル等を用いて第２信号強度（ kui）を求めることができる。この信号kuiを表示側の装置に送信すれば画像提供側と表示側で同じ色を表示することができる。
このように、表示側の第２比（rui(kui)が取るべき特定の値が求まれば，ルックアップテーブル等を用いることによって、その特定の値を作るのに必要な信号値（kui）を、表示側の装置で使用することができる（Ｓ８）。
【発明の効果】
【００２６】
請求項１乃至３記載の発明によって、画像を作成する側と表示する側に高価な装置を必要とせずに利用者の視覚的な色の差を，単に測定装置や経験豊富なオペレーターなどで補正可能な物理的な色の差にとどまらず個人間の視覚特性の違いに依存する色の差まで含めて，最小とすることが可能である。
【図面の簡単な説明】
【図１】 本発明が行う色の補正の流れを示す。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for minimizing a visual color difference between a provider and a user and between users in image display between computers.
[0002]
[Prior art]
In business transactions on the Internet, the fidelity of color expression on a computer screen has become a problem. For example, in mail order sales using the WWW, there is a considerable difference in the color appearance between the product viewed on the client's screen and the actual product.
[0003]
There is a technique such as spectrophotometry using a measuring device to perform accurate adjustment with the current technology. This method enables absolute color adjustment.
[0004]
[Problems to be solved by the invention]
However, adjusting the color of the display device requires an expensive device and requires technically sophisticated and complicated operations.
[0005]
Furthermore, there is a problem that the relative color development between the image creation side and the display side is not adjusted.
[0006]
In addition, since the visual characteristics of individual users are not taken into account, there is a problem that the appearance of colors differs among users even if the physical characteristics of colored light are the same.
[0007]
[0008]
According to the first to third aspects of the present invention, the difference in the visual color of the user can be corrected by simply using a measuring device or an experienced operator without requiring an expensive device between the image creating side and the display side. It is possible to minimize not only the possible physical color differences, but also the color differences that depend on differences in visual characteristics among individuals.
[0009]
[Means for Solving the Problems]
The color calibration method according to claim 1 is a color correction method for correcting a color on the image display side when an image created on the image creation side is displayed on the image display side via a network such as the Internet. The first ratio (rv i (kv i )) from the luminance characteristic value of the basic primary color measured in the image display device on the image creation side to the maximum luminance of the primary color alone, and the image display device on the image display side A second ratio (ru i (ku i )) to the maximum luminance of the primary color alone is obtained from the luminance characteristic value of the basic primary color in the image, and two arbitrary primary colors on the image creation side and the image display side are obtained. to match the luminance has a value signal values of any primary color in and by measuring the signal value of the other specific colors, first ratio of any primary colors taken when the matching of the image producer Calculate the value that the first ratio of other specific primary colors takes , Based on the maximum brightness of the arbitrary primaries having the third ratio the maximum brightness other specific primary color has a (Rv i, p), any primary color in the case of the coincidence of the image producer And the signal value of the other specific primary color are measured, the value taken by the second ratio of the arbitrary primary color and the value taken by the second ratio of the other specific primary color are calculated, and the arbitrary primary color is based on the maximum brightness with, the fourth ratio maximum brightness other specific primary color has (Ru i, p) is calculated, representing the luminance ratio between the image creation side to the
FIG. 1 shows the flow of color correction performed by the present invention.
[0010]
In the color calibration method according to a second aspect, the calculation result calculates a specific value that the second ratio should take so as to satisfy the condition of the following equation (Equation 1).
[0011]
(Equation 1)
rui (kui) = rvi (kvi) × (Rui, p) / (Rvi, o) × Q
[0012]
4. The color calibration method according to claim 3, wherein a ratio (kvi / kvi, max) with respect to the maximum value of the signal on the image creating side is (ki, max) when the maximum value of the signal of an arbitrary primary color Ci is (ki, max). ) And the ratio (kui / kui, max) to the maximum value of the signal on the image display side are close to each other, the fifth ratio is selected.
[0013]
For the derivation of the luminance ratio of the basic primaries, two colors are selected so as to cover all defined basic primaries, and the two colors are compared and the measurement result of the signal value is used so that the luminance matches with human vision. It is characterized by doing.
[0014]
Several methods for measuring the luminance ratio of two colors already exist, and the HFP method or motion cancellation method is known. When these methods are used, since the measurement method depends on the human eye, the difference in visual characteristics among users is automatically included in the measurement value.
[0015]
The “defined primary primaries” are combinations of three or more independent colors that can be used in the display system. In principle, any three or more colors can be selected. In the case of different basic primary colors on the image providing side and the display side, it is necessary to convert each color luminance data in the color space defined by the luminance value into luminance data of the basic primary color on the display side. Since this conversion is possible in an arbitrary color space, the following description will be made on the assumption that the image providing side and the display side use the same basic primary color.
[0016]
Assuming that the primary primaries are n, and each of them is C1, C2,.. If the intensity of the signal of the basic primary color Ci is ki and the luminance with respect to it is Li (ki), the color can be expressed as (L1 (k1), L2 (k2),..., Ln (kn)).
[0017]
If the maximum luminance of the basic primary color Ci is Li, max, it can be expressed as (Equation 2). Here, ri (ki) is a ratio to the maximum luminance of each primary color alone, and takes a value between 0 and 1.
(Equation 2) Li (ki) = ri (ki) x Li, max
In this way, from the first signal intensity (kvi), which is the intensity of the signal of the primary primary color in the image display device on the image creation side, the basic primary color measured or estimated in the image display device on the image creation side. A first ratio (rvi (kvi)) to the maximum luminance of the primary color alone is obtained from the luminance characteristic value. At this time, (Expression 2) is expressed by the following equation.
Lvi (kvi) = rvi (kvi) × Lvi, max
Similarly, from the second signal intensity (kui), which is the intensity of the basic primary color signal on the image display side, the primary color is determined from the luminance characteristic value of the basic primary color measured or estimated in the image display device on the image display side. A second ratio (rui (kui)) for a single maximum luminance is obtained. At this time, (Equation 2) is expressed by the following equation (S1).
Lui (kvi) = rui (kui) × Lui, max
[0018]
The ratio ri (ki) (first ratio (rvi (kvi)) and second ratio (rui (kui))) of each primary color with respect to the maximum luminance is derived using an existing method for measuring the luminance for each gradation. . This derivation method is performed by storing and using ki and ri (ki) data in a lookup table or the like.
[0019]
Then, using a lookup table or the like, ri (ki) can be derived from the signal value (or signal intensity) ki, or conversely, ki can be derived from ri (ki).
If a specific value to be taken by the second ratio (rui (kui)) on the display side is obtained by using a look-up table or the like in this way, the second signal necessary to create the specific value is obtained. The intensity (kui) value can be used in the display-side device (for example, it can be used in (S8) shown in FIG. 1).
[0020]
It is assumed that both signals are adjusted so that the luminances of the two primary colors Ca and Cb match, and the luminances match when the signals Ca and Cb are Ka, b, and Kb, a, respectively. When defined as Ra, b = ra (Ka, b) / rb (Kb, a), (Equation 3) is obtained.
(Equation 3) Ra, b = ra (Ka, b) / rb (Kb, a) = Lb, max / La, max
From (Equation 3), even if measurement is not performed such that the luminances of the two primary colors Ca and Cb match, if there are results of measurement of Ca and Cc and measurement of Cb and Cc, Ra, b = Ra , c / Rb, c. For this reason, the measurement for matching the luminances of the two primary colors needs to cover all primary colors.
In this way, when the luminances of the two primary colors match, the third ratio (Rvi, o) with respect to the highest luminance of other specific primary colors is calculated with reference to the highest luminance of any primary color. (S2).
[0021]
From (Equation 3), the maximum luminance Lvi, max of an arbitrary primary color Ci on the image providing side is expressed by the following expression using a certain primary color Co as the maximum luminance Lvo, max.
Lvi, max = 1 / Rvi, o × Lvo, max Substituting this equation into (Equation 2) yields (Equation 4).
(Equation 4) Lvi (kvi) = rvi (kvi) / Rvi, o × Lvo, max
In this way, the luminance of any primary color is calculated from the first ratio, the third ratio, and the maximum luminance of the specific primary color (S3).
[0022]
Similarly, on the image display side, (Equation 5) is established using the maximum luminance of the primary color Cp.
(Equation 5) Lui (kui) = rui (kui) / Rui, p × Lup, max
Here, the fourth ratio (Rui, p) with respect to the display-side luminance of any primary color on the image display side is calculated using the method (S2) (S4).
[0023]
When the luminances of the corresponding primary colors of the pixels constituting the image are compared on the image providing side and the display side, if the ratio is constant regardless of the type of pixel or primary color, they are the same color. This is expressed by the following equation (6).
(Equation 6) Lui (kui) = q × Lvi (kvi)
However, q is a value that does not depend on the pixel or color.
[0024]
Substituting (Equation 4) and (Equation 5) into (Equation 6) and transforming it into (Equation 7).
(Equation 7) rui (kui) = rvi (kvi) × Rui, p / Rvi, o × Q
However, Q = Lvo, max / Lup, max × q.
In this way, the luminance ratio between the image creation side and the display side is expressed by a single value Q (fifth ratio) (the above equation Q = Lvo, max / Lup, max × q (S5).
[0025]
Since terms other than Q in (Equation 7) can be calculated before image display, the right side of (Equation 6) for an arbitrary primary color Ci is expressed as an unknown value Q. If the maximum value of the primary color Ci signal is ki, max, Q is selected so that the ratios kvi / kvi, max and kui / kui, max to the maximum value of the signal on the image providing side and the display side are close.
That is, as described above, if the maximum value of the primary color Ci signal is ki, max, the ratios kvi / kvi, max and kui / kui, max with respect to the maximum value of the signal on the image providing side and the display side are close to each other. The fifth ratio Q is selected (S6).
When the first signal intensity (kvi), which is the intensity of the basic primary color signal on the image creation side, is a certain value, the creation side third ratio (Rvi, o) and the display side fourth ratio ( Rui, p) and the fifth ratio (Q) are used to calculate a specific value to be taken by the display-side second ratio (rui (kui)) using (Equation 7) (S7). .
If a specific value to be taken by rui (kui) is obtained, the second signal strength (kui) can be obtained using a lookup table or the like. If the signal kui is transmitted to the display side device, the same color can be displayed on the image providing side and the display side.
In this way, if a specific value to be taken by the display side second ratio (rui (kui) is obtained, a signal value (kui) necessary to create the specific value by using a lookup table or the like. Can be used in the display-side device (S8).
【The invention's effect】
[0026]
According to the first to third aspects of the present invention, the difference in the visual color of the user is simply corrected by a measuring device or an experienced operator without requiring an expensive device on the image creation side and the display side. It is possible to minimize not only the possible physical color differences, but also the color differences that depend on differences in visual characteristics among individuals.
[Brief description of the drawings]
FIG. 1 shows a flow of color correction performed by the present invention.
Claims (3)
前記画像作成側の画像表示装置に於ける測定された基本原色の輝度特性値から原色単独の最大輝度に対する第１比（ rvi ( kvi ) ）と、前記画像表示側の画像表示装置に於ける基本原色の輝度特性値から原色単独の最大輝度に対する第２比（ rui ( kui ) ）とを求めておき、
前記画像作成側及び前記画像表示側に於ける任意の２つの原色が有する輝度を一致させ、該画像作成側の前記一致する場合に於ける任意の原色の信号値および他の特定の原色の信号値を測定して、任意の原色の第１比がとる値と他の特定の原色の第１比がとる値を算出して、前記任意の原色が有する最高輝度を基準として、前記他の特定の原色が有する最高輝度に対する第３比（ Rvi,p ）と、該画像作成側の前記一致する場合に於ける任意の原色の信号値および他の特定の原色の信号値を測定して、任意の原色の第２比がとる値と他の特定の原色の第２比がとる値を算出して、前記任意の原色が有する最高輝度を基準として、前記他の特定の原色が有する最高輝度に対する第４比（ Rui,p ）を算出し、
前記画像作成側と前記画像表示側との間の輝度比を表現する第５比（ Q ）を算出し、
前記画像作成側に於ける基本原色の信号の強度である第１信号強度（ kvi ）がある値であるときに、前記画像作成側の前記第１比、前記第３比、画像表示側からの前記第４比と前記第５比から、画像表示側に於ける基本原色の輝度特性値から原色単独の最大輝度に対する第２比（ rui ( kui ) ）が取るべき特定の値を算出し、その第２比（ rui ( kui ) ）に対応する第２信号強度（ kui ）を算出して、
前記画像作成側から送信される信号値を、前記算出された前記第２比が取るべき特定の値に対応する画像表示側信号値に補正することを特徴とする色キャリブレーション方法。A color correction method for correcting a color on the image display side when displaying an image created on the image creation side on the image display side via a network such as the Internet,
The first ratio (rv i (kv i )) from the luminance characteristic value of the basic primary color measured in the image display device on the image creation side to the maximum luminance of the primary color alone, and the image display device on the image display side The second ratio (ru i (ku i )) to the maximum brightness of the primary color alone is obtained from the brightness characteristic value of the basic primary color.
The image producer and to match the brightness with any two primary colors in the image display side, the signal value and other signals specific primary colors of any primary colors in the case of the coincidence of the image producer Measure the value, calculate the value taken by the first ratio of an arbitrary primary color and the value taken by the first ratio of another specific primary color, and use the maximum luminance of the arbitrary primary color as a reference to determine the other specific Measuring the third ratio (Rv i, p ) for the highest luminance of the primary color and the signal value of any primary color and the signal value of any other specific primary color in the matching case on the image creation side; It calculates a second ratio takes the value of any value and other specific primaries second ratio takes the primary colors based on the maximum brightness of the arbitrary primaries having the highest luminance the other specific colors have Calculate the fourth ratio (Rui , p ) to
Calculating a fifth ratio (Q) representing a luminance ratio between the image creation side and the image display side;
When a first signal strength (kv i) is the value of the intensity of the signal at the fundamental primary colors in the image producer, the first ratio of the image producer, the third ratio, the image display side From the fourth ratio and the fifth ratio, a specific value to be taken by the second ratio (ru i (ku i )) with respect to the maximum luminance of the primary color alone is calculated from the luminance characteristic value of the basic primary color on the image display side. And calculating a second signal strength (ku i ) corresponding to the second ratio (ru i (ku i )),
A color calibration method, wherein a signal value transmitted from the image creation side is corrected to an image display side signal value corresponding to a specific value to be taken by the calculated second ratio.
（数１）
rui ( kui ) ＝ rvi ( kvi ) × ( Rui,p ) ／ ( Rvi,o ) × QThe color calibration method according to claim 1, wherein the calculation result calculates a specific value that the second ratio should take so as to satisfy the condition of the following equation (Equation 1).
(Equation 1)
ru i (ku i ) = rv i (kv i ) × (Ru i, p ) / (Rv i, o ) × Q
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