JPH01141326A - Colorimetric method - Google Patents
Colorimetric methodInfo
- Publication number
- JPH01141326A JPH01141326A JP30121387A JP30121387A JPH01141326A JP H01141326 A JPH01141326 A JP H01141326A JP 30121387 A JP30121387 A JP 30121387A JP 30121387 A JP30121387 A JP 30121387A JP H01141326 A JPH01141326 A JP H01141326A
- Authority
- JP
- Japan
- Prior art keywords
- value
- light beam
- spectrophotometer
- light
- reflection factor
- 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
- 238000004737 colorimetric analysis Methods 0.000 title description 5
- 238000005286 illumination Methods 0.000 claims abstract description 5
- 238000001228 spectrum Methods 0.000 claims abstract description 3
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000002798 spectrophotometry method Methods 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 abstract description 5
- 229910052736 halogen Inorganic materials 0.000 abstract description 3
- 150000002367 halogens Chemical class 0.000 abstract description 3
- 239000000123 paper Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Spectrometry And Color Measurement (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、物体の色を測定する方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of measuring the color of an object.
（従来の技術）
近年、品質管理技術の向上や製造工程の自動化への要請
から、従来は定性的にまたは感覚的にとらえていた現象
を、定量的にまたは客観的に把握しようとする動きが各
分野で活発化している。(Conventional technology) In recent years, due to demands for improved quality control technology and automation of manufacturing processes, there has been a movement to quantitatively or objectively understand phenomena that were previously perceived qualitatively or intuitively. It is becoming more active in each field.
色の問題に関しても同様であり、例えば紙、繊維、布、
プラスチックフィルム、乳化液、パルプの分散液、クリ
ーム類、サスペンション、食塩、砂糖、結晶性化学薬品
、各種粉末、塗料などの色を判定するときは、光学式の
測色計や色差計などを使用した色の判定が通常行われて
いる。The same applies to color issues, such as paper, fiber, cloth,
Optical colorimeter, color difference meter, etc. are used to judge the color of plastic films, emulsions, pulp dispersions, creams, suspensions, salt, sugar, crystalline chemicals, various powders, paints, etc. Color judgment is normally performed.
ところで、例えば祇パルプ工場ではかかる測色計や色差
計として、従来は日本工業規格のＪＩＳＺ８７２２に基
づくハンター式比色光沢計を用い、青色、緑色及び琥珀
色のフィルターを使用したときの各々の反射率を測定し
、得られた反射率から紙や塗被紙などの白色度、色相な
どの色の測定が長年に亘り実施されてきた。例えば、そ
の白色度である青色フィルターでの反射率値（ＨＢ）を
測定する場合には、主波長４５７０ｍの青色フィルター
を使用し、その値を得ている。そして更に近年稀にみる
測色技術の急速な進歩に伴い、上記の如き青色フィルタ
一方式の色差計から分光光度計を用いて分光反射率曲線
を描き、この曲線がら三刺激値のχ値を演算する方式の
色差計への技術の移行が起こっている。ところが、この
方式の場合には以下のような問題が発生する。By the way, for example, in the Gio pulp mill, a Hunter type colorimetric gloss meter based on the Japanese Industrial Standard JIS Z8722 has been used as such a colorimeter or color difference meter, and each reflection when using blue, green, and amber filters has been used. For many years, colors such as whiteness and hue of paper and coated paper have been measured by measuring the reflectance and measuring the reflectance obtained. For example, when measuring the reflectance value (HB) with a blue filter, which is the whiteness, a blue filter with a dominant wavelength of 4570 m is used to obtain the value. Furthermore, with the rapid progress of colorimetry technology that has rarely been seen in recent years, a spectral reflectance curve is drawn using a spectrophotometer from a color difference meter with a single blue filter as described above, and the χ value of the tristimulus value is calculated from this curve. There is a shift in technology to color difference meters that use calculation methods. However, in this method, the following problems occur.
（発明が解決しようとする問題点）
即ち、分光光度計方式では測定したχ値を用いてハンタ
ーのフィルタ一方式で得られる反射率値（ＨＢ）に演算
する必要があり、この場合従来の青色フィルタ一方式と
分光光度計方式の関係式は第（１）式に示されるように
一次関係式である。(Problem to be Solved by the Invention) In other words, in the spectrophotometer method, it is necessary to use the measured χ value to calculate the reflectance value (HB) obtained with one type of Hunter filter. The relational expression between the filter type and the spectrophotometer type is a linear relational expression as shown in Equation (1).
そこで、本願発明者は上記関係式が精度の高いものであ
るかを確かめるべ（、様々なデーターの場合に対応し、
第（２）式の如き一次近似式を導入して演算によって両
者の相関をみることを試みた。Therefore, the inventor of the present application should check whether the above relational expression is highly accurate (corresponding to the case of various data,
An attempt was made to introduce a first-order approximation equation such as equation (2) and use calculations to see the correlation between the two.
Ｈｌ ＝３．ＸＺ＋ａｚ （２）（但し、ａｌと
ａ２は常数である。）
しかしながら、両者の相関はその相関係数が０゜９６１
と低く且つ標準偏差が１．０６３と悪くなり、物体の色
の品質管理などにおいて支障をきたす恐れのあることが
判明した。そのため、両者の間に極めて高い相関が得ら
れる測色方法の開発が待望されているのが現状である。Hl=3. XZ+az (2) (However, al and a2 are constants.) However, the correlation coefficient between the two is 0°961
It was found that the standard deviation was as low as 1.063, which may cause problems in quality control of the color of objects. Therefore, there is currently a long-awaited development of a colorimetric method that can obtain an extremely high correlation between the two.
本発明は、分光光度計方式の色差計を使用し、従来のフ
ィルタ一方式のもので得られた値と極めて相関が高いＨ
ｌ値が得られる測色方法を提供することを目的とするも
のである。The present invention uses a spectrophotometer-type color difference meter, and the H
The object of the present invention is to provide a colorimetric method that can obtain the l value.
（問題を解決するための手段）
本発明は、予め測色演算部に三刺激値のｙ値並びに国際
照明委員会の表色座標値のχ値及びｙ値を変数とする式
Ｈ＊ ＝Ｃ１ｘｙ＋ｃ、Ｘχ十Ｃ１Ｘ ｙ ＋ Ｃａ
（但し、ＣＩ−Ｃ４は常数である。）を設定しておき
、分光測色方式で物体の色を求める際に、分光スペクト
ルから求まる該ｙ値、χ値、ｙ値を前記設定式に入力す
ることにより、主波長４５７ｎｍの青色フィルターよっ
て得られる物体の反射率値（Ｈ６）を演算することを特
徴とする測色方法である。(Means for Solving the Problem) The present invention provides a formula H* =C1xy+c in which the y value of the tristimulus value and the χ value and y value of the colorimetric coordinate values of the International Commission on Illumination are used as variables in the colorimetric calculation unit in advance. ,Xχ1C1X y + Ca
(However, CI-C4 is a constant.) When determining the color of an object using the spectrophotometric method, enter the y value, χ value, and y value found from the spectroscopic spectrum into the above setting formula. This is a colorimetry method characterized by calculating the reflectance value (H6) of an object obtained by a blue filter with a main wavelength of 457 nm.
（作用） 本発明の方法を図面に基づき、さらに詳細に説明する。(effect) The method of the present invention will be explained in more detail based on the drawings.
第１図は、本発明に係る測色方法に用いられる装置を概
略的に示した図である。FIG. 1 is a diagram schematically showing an apparatus used in the color measurement method according to the present invention.
被測定物（１１がシートである場合に、その白色度であ
る反射率値を光反射型測色装置（２）によって測定する
時には、ハロゲン光Ｒ（３）よりの光は参照のためのモ
ニター光（４）とシートに照射するためのサ 。When the object to be measured (11) is a sheet and its reflectance value, which is the whiteness, is measured by the light reflection type colorimeter (2), the light from the halogen light R (3) is used as a monitor for reference. Light (4) and a sa for irradiating the sheet.
ンプル光（５）とに分岐され、サンプル光は照明用光フ
ァイバー（６）を経由し、ヘッド部（７）からシート面
に照射される。光は、シート面で反射されて反射光とな
り、受光用光ファイバー（８）に入射し、この中を経由
して切替器（９）に到達する。The sample light is branched into a sample light (5), and the sample light passes through an illumination optical fiber (6) and is irradiated onto the sheet surface from the head section (7). The light is reflected by the sheet surface and becomes reflected light, which enters the light-receiving optical fiber (8) and reaches the switch (9) via this.
切替器（９）は、制御部０ωから送られてくるシーケン
ス信号に従って、上記の如く各光ファイバーを経由して
きたサンプル光とモニター光とを切り替えて次の分光光
度計αυに送る。分光光度計では、サンプル光とモニタ
ー光は波長を例えば５ｎｍ毎に分光され、各波長帯域毎
の分光反射率の分布を求めて三刺激値Ｘ、Ｙ、Ｚを求め
るとともに、国際照明委員会（以下、ＣＩＥという）色
度座標値であるχ、ｙを演算し、これらの値を測色演算
部（２）に送る。The switch (9) switches between the sample light and the monitor light that have passed through each optical fiber as described above, and sends it to the next spectrophotometer αυ according to the sequence signal sent from the control unit 0ω. In the spectrophotometer, the sample light and monitor light are separated into wavelengths of, for example, 5 nm, and the distribution of spectral reflectance for each wavelength band is determined to determine the tristimulus values X, Y, and Z. The chromaticity coordinate values χ and y (hereinafter referred to as CIE) are calculated, and these values are sent to the colorimetric calculation unit (2).
測色演算部（２）は、これに種々な演算式を予め設定し
ておくことによって、上記の如き三刺激値やＣＩＥ色度
座標値を用いてＬａｂ表色系、Ｌ′″ａ１ｂ０表色系な
どの色と色差を得るものであるが、本願発明の場合には
特にＣＩＥ色度座標値のχ、ｙと三刺激値のｙ値とを変
数した場合に、これらと青色フィルターでの反射率測定
値（Ｈ６）の相関が高いことを見い出し、以下のように
極めて特殊な形の演算式を設定しておきＨ，値を演算す
ると、その相関係数が０．９９５から０．９９９に亘る
高い値で且つ標準偏差が０．４１４と極めて良好な相関
を示すことが判った。By setting various calculation formulas in advance, the colorimetric calculation unit (2) uses the above-mentioned tristimulus values and CIE chromaticity coordinate values to calculate the Lab color system, L'''a1b0 color system. However, in the case of the present invention, especially when the CIE chromaticity coordinate values χ, y and the tristimulus y value are used as variables, these and the reflection at the blue filter are obtained. We found that the correlation between the rate measurement values (H6) was high, and when we set up a very special formula as shown below and calculated the H value, the correlation coefficient increased from 0.995 to 0.999. It was found that there was a very good correlation with a wide range of high values and a standard deviation of 0.414.
ＨＢ ＝Ｃ１Ｘ Ｙ ＋ （：２ｘ Ｚ ＋（：、ｘ
ｙ ＋（：、 （３４（但し、Ｃ，−Ｃ，は常数。）
演算して得られた結果は表示部ＯＪに表示する。HB = C1X Y + (:2x Z +(:, x
y + (:, (34 (However, C, -C, are constants.) The result obtained by the calculation is displayed on the display section OJ.
なお、本願発明の光反射型測色装置において、光源光や
機械系統や電気系統などの変動、またはダスト付着など
が原因となって測定結果がかなり影響を受けるので、か
かる影響をキャンセルするために、測定間隔毎に光源光
そのものの測定を行なうことや基準として反射率が分か
っている白板を使用してキャリブレーションを行うのは
、本願発明の好ましい実施態様である。即ち、第１図に
示すようにヘッド部（７）をシート面に垂直方向に離れ
るように後退させるためのシリンダー装置α船と、固定
台αりに固定されている標準白板αｅをシート面に平行
方向にヘッド部の先端部に向かって動かすためのシリン
ダー装置αηを設けて置き、キャリブレーションの時に
はヘッド部を後退させた後、標準白板をヘッド部とシー
トとの間に移動させ、標準白板面に光を反射させて演算
して得られた値を基準値とし、以下の式に基づきキャリ
ブレーションを行って、より精度の高い測定が可能とな
る。In addition, in the light reflection type colorimeter of the present invention, the measurement results are considerably affected by fluctuations in the light source, mechanical system, electrical system, etc., or dust adhesion, so in order to cancel such effects, it is necessary to A preferred embodiment of the present invention is to measure the light source itself at each measurement interval and to perform calibration using a white board whose reflectance is known as a reference. That is, as shown in Fig. 1, a cylinder device α for moving the head part (7) back in a direction perpendicular to the seat surface, and a standard white plate αe fixed to a fixed base α are attached to the seat surface. A cylinder device αη is provided to move the head toward the tip in a parallel direction, and after retracting the head during calibration, a standard white plate is moved between the head and the seat. By using the value calculated by reflecting light on the surface as a reference value and performing calibration based on the following formula, more accurate measurements can be made.
各波長毎の物体からの光反射率をηλとした場合に、
Ｒλ−ＤＲＡ Ｍλ−Ｄλ
以下に実施例をあげて本発明をより具体的に説明するが
、もちろんこれらに限定されるものではない。また、特
に断らない限り例中の部および％はそれぞれ重量部％を
示す。When the light reflectance from an object for each wavelength is ηλ, Rλ-DRA Mλ-Dλ The present invention will be explained in more detail with reference to examples below, but of course it is not limited to these. . In addition, unless otherwise specified, parts and % in the examples each indicate parts by weight.
次の組成からなる塗被液をコーレス分散機にて調製した
。A coating liquid having the following composition was prepared using a Coles disperser.
カオリン（ＥＭＣ社製、ＵＷ−９０） ８０部重質炭
酸カルシウム（備北粉化工業社製、ソフトン２２００）
２０部スチレン・ブタジェン共重
合体ラテックス（住人ノーガタツタ社製、５Ｎ−３０７
）１０部酸化変性澱粉（玉子コーンスターチ社製、エー
スＡ） ５部ポリアク
リル酸ソーダ ０．３部塗被液の固形分
濃度を６０％に調製、し、米坪８０ｇ／ｒｒｒの原紙に
乾燥後の塗被量が４０ ｇ ／ ｎｒとなるようブレー
ドコーターによりコーター速度６００ｍ／分で両面塗工
して、米坪１２０ ｇ／ｒｄのコート塗被紙を得た。Kaolin (manufactured by EMC, UW-90) 80 parts heavy calcium carbonate (manufactured by Bihoku Funka Kogyo, Softon 2200)
20 parts styrene-butadiene copolymer latex (manufactured by Juju Noga Tatsuta Co., Ltd., 5N-307
) 10 parts Oxidized modified starch (manufactured by Tamago Cornstarch Co., Ltd., Ace A) 5 parts Sodium polyacrylate 0.3 parts The solid content of the coating liquid was adjusted to 60%, and after drying on base paper with a weight of 80 g/rrr. Coating was carried out on both sides using a blade coater at a coater speed of 600 m/min so that the coating amount was 40 g/nr to obtain coated paper with a weight of 120 g/rd.
得られたコート塗被紙をスーパーカレンダーにより、平
滑化処理を行った。The obtained coated paper was smoothed using a super calender.
実施例としては、平滑化処理して得られた７８種類のコ
ート塗被紙を、第１図に示すように本願発明の方法に係
る光反射型測色装置（２）のヘッド部（７）の先端部か
ら所定距離になるように設け、測色演算部側には第（３
）式の各常数の０１には０．９５９、Ｃ２には−２７２
７、Ｃ３には１０７６、Ｃ４には５１７．５の値を設定
した後、Ｈ６値を演算した。As an example, 78 types of coated paper obtained by smoothing treatment were applied to the head section (7) of a light reflection type colorimeter (2) according to the method of the present invention, as shown in FIG. A third (third)
) 0.959 for each constant 01 in the formula, -272 for C2
7. After setting the values of 1076 for C3 and 517.5 for C4, the H6 value was calculated.
このようにして得られた本願発明のＨ，値を横軸に取り
、また同一のサンプル紙を用いて従来の青色フィルター
での比色光゛沢計で測定したＨ８値を縦軸に取り両者の
相関をみた図が、第２図に示されている。The H value of the present invention thus obtained is plotted on the horizontal axis, and the H8 value measured using the same sample paper using a conventional colorimetric photometer with a blue filter is plotted on the vertical axis. A diagram showing the correlation is shown in Figure 2.
第２図から明らかなように、両者の相関はその相関係数
が０．９９４と高く且つ標準偏差が０．４１４と極めて
良好な相関を示している。As is clear from FIG. 2, the correlation between the two shows an extremely good correlation with a high correlation coefficient of 0.994 and a standard deviation of 0.414.
一方、比較例としては第（２）式の一次近似式をその常
数のａ、が０．９７８でａ２が−４，９３８である場合
で測色演算部に設定し、上記の同一サンプルを使用して
Ｈ３値を演算した。On the other hand, as a comparative example, the linear approximation formula of equation (2) is set in the colorimetric calculation section when its constant a is 0.978 and a2 is -4,938, and the same sample as above is used. The H3 value was calculated.
第（２）式の一次近似式で得られた結果を横軸に取り、
従来の比色光沢計で測定したＨ３値を縦軸に取った結果
が第３図に示されている。第３図に示すように、両者の
相関はその相関係数が０．９６１と低（且つ標準偏差が
１．０６３と非常に悪いことが明らかである。Taking the result obtained from the linear approximation formula of equation (2) on the horizontal axis,
The results are shown in FIG. 3, with the H3 value measured using a conventional colorimetric gloss meter plotted on the vertical axis. As shown in FIG. 3, it is clear that the correlation between the two is low, with a correlation coefficient of 0.961 (and a very poor standard deviation of 1.063).
（効果）
本願発明の方法に係る光反射型測色装置を使用すれば、
物体の反射率値を従来のフィルタ一方式の色差計で得ら
れる値と極めて高い相関で常に得られることができる。(Effect) If the light reflection type colorimeter according to the method of the present invention is used,
The reflectance value of an object can always be obtained in extremely high correlation with the value obtained with a conventional filter-type color difference meter.
従って、品質管理において支障をきたすことが全くなく
なり、品質外の製品を出荷することがなくなるとともに
、フレイムの発生件数が激減する。Therefore, there is no problem in quality control, there is no need to ship out-of-quality products, and the number of flames is drastically reduced.
第１図は、本発明に係る測色方法をシートの反射率値の
測定に適用した場合の概略説明図である。第２図は、シ
ートの反射率値を従来のフィルター式色差計で測定して
場合と本願発明の特殊な演算式を設定して測定した場合
との両者の相関を示す図である。第３図は、シートの反
射率を従来のフィルター式色差計で測定した場合と、従
来の一次関係式を設定して測定した場合との両者の相関
を示す図である。
（１）：被測定物（シート）（２）：光反射型測色装置
（３）：ハロゲン光源 （４）：モニター光（５）
：サンプル光 （６）：照明用光ファイバー（７
）：ヘッド部 （８）：受光用光ファイバー（
９）：切換器 ａＩ：制御部ＯＤ：分光光度
計 （２）：測色演算部α３＝表示部
α４１＝シリンダ一装置ａ！９＝固定台
αｅ：標準白板Ｏｎニジリンダー装置FIG. 1 is a schematic explanatory diagram when the color measurement method according to the present invention is applied to the measurement of the reflectance value of a sheet. FIG. 2 is a diagram showing the correlation between the case where the reflectance value of the sheet is measured with a conventional filter-type color difference meter and the case where the reflectance value is measured by setting a special calculation formula of the present invention. FIG. 3 is a diagram showing the correlation between the case where the reflectance of a sheet is measured with a conventional filter-type color difference meter and the case where it is measured by setting a conventional linear relational expression. (1): Object to be measured (sheet) (2): Light reflection type colorimeter (3): Halogen light source (4): Monitor light (5)
: Sample light (6) : Optical fiber for illumination (7
): Head part (8): Optical fiber for light reception (
9): Switch aI: Control unit OD: Spectrophotometer (2): Colorimetric calculation unit α3 = Display unit
α41=Cylinder-device a! 9=Fixed stand
αe: Standard white board On Niji Linder device
Claims (1)
会の表色座標値のｘ値及びｙ値を変数とする式Ｈ＿Ｂ＝
Ｃ＿１×Ｙ＋Ｃ＿２×ｘ＋Ｃ＿３×ｙ＋Ｃ＿４（但し、
Ｃ＿１〜Ｃ＿４は常数である。）を設定しておき、分光
測色方式で物体の色を求める際に、分光スペクトルから
求まる該Ｙ値、ｘ値、ｙ値を前記設定式に入力すること
により、主波長４５７ｎｍの青色フィルターよって得ら
れる物体の反射率値（Ｈ＿Ｂ）を演算することを特徴と
する測色方法。Formula H_B= in which the Y value of the tristimulus value and the x value and y value of the color coordinate value of the International Commission on Illumination are used as variables in the colorimetric calculation unit in advance.
C_1×Y+C_2×x+C_3×y+C_4 (However,
C_1 to C_4 are constants. ), and when determining the color of an object using the spectrophotometric method, by inputting the Y value, x value, and y value found from the spectroscopic spectrum into the setting formula, A color measurement method characterized by calculating a reflectance value (H_B) of an obtained object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30121387A JPH06103225B2 (en) | 1987-11-27 | 1987-11-27 | Color measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30121387A JPH06103225B2 (en) | 1987-11-27 | 1987-11-27 | Color measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01141326A true JPH01141326A (en) | 1989-06-02 |
| JPH06103225B2 JPH06103225B2 (en) | 1994-12-14 |
Family
ID=17894147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30121387A Expired - Fee Related JPH06103225B2 (en) | 1987-11-27 | 1987-11-27 | Color measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06103225B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08219886A (en) * | 1995-02-14 | 1996-08-30 | Honshu Paper Co Ltd | Quantitative measuring method of white paper and printing paper face quality |
-
1987
- 1987-11-27 JP JP30121387A patent/JPH06103225B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08219886A (en) * | 1995-02-14 | 1996-08-30 | Honshu Paper Co Ltd | Quantitative measuring method of white paper and printing paper face quality |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06103225B2 (en) | 1994-12-14 |
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