Expression using subtraction of visible light spectra
Http://spectra.nomoto.org/2004/08/09/%E7%85%A7%E6%98%8E%E3%81%A8%E3%83%87%E3%82%A3%E3%82%B9%E3%83%97%E3%83%AC%E3%82%A4/
Https://www.e-education.psu.edu/meteo300/node/683
Https://www.webexhibits.org/causesofcolor/17B.html
I made it as a reference.
Use
(3) Select the all layers and adjust the size.
4 Change the intensity of the rainbow color by changing the transparency of the layer with [1].
(Ii) The rainbow color will be saturated normally. This can be prevented by adjusting the strength.
(Iii) In principle, it is not suitable for the groundwork of a color near black and a color close to white. White in particular has a negative effect on the subtraction, which is an unnatural color. It is recommended that you Nakami the base of the degree.
(Iv) This material is made of 4000 * 4000. The horizontal axis corresponds to the wavelength [1/4nm], and can be used to produce any spectrum color or any single-wavelength color.
Principle
Human color vision is determined by the reaction strength of L pyramidal cells, m-pyramidal cells, and s-pyramidal cells.
The visual light was expressed by converting the base of the color space from the LMS to RGB.
At this time, there is a wavelength where the RGB value takes a negative value.
This was expressed using a subtraction layer.
For more information, use a matrix of spectral sensitivity φ and RGB spectra
R_i = ∫ φ _i I_r d λ
G_i = ∫ φ _i I_g d λ
B_i = ∫ φ _i I_b d λ
(El em es) (R G B) ((R G B) ^-1 (φ l φ m φ s) ^ T)
And output the last parenthesis.
可視光スペクトルの減算を用いた表現
・http://spectra.nomoto.org/2004/08/09/%E7%85%A7%E6%98%8E%E3%81%A8%E3%83%87%E3%82%A3%E3%82%B9%E3%83%97%E3%83%AC%E3%82%A4/
・https://www.e-education.psu.edu/meteo300/node/683
・https://www.webexhibits.org/causesofcolor/17B.html
を参考にして作りました。
使い方
(3)すべてのレイヤーを選択し、大きさを調整する。
(4)[1]の付いているレイヤーの透明度を変えることで虹色の強さを変える。
(ii)普通に重ねると虹色が飽和してしまいます。これは強さを調整して防ぐことが出来ます。
(iii)原理上、黒に近い色や白に近い色の下地には合いません。特に白には減算が悪影響を及ぼし、不自然な色になります。中明度の下地に重ねることをお勧めします。
(iv)この素材は4000*4000できています。横軸は波長[1/4nm]に対応しており、これを用いることで、任意のスペクトルの色や任意の単波長の色を作ることが出来ます。
原理
ヒトの色覚はl錐体細胞, m錐体細胞, s錐体細胞の反応する強さによって決まります。
色空間の基底をlmsからRGBに変換することで可視光を表現しました。
この時、RGB値が負の値を取る波長が存在します。
これを減算レイヤーを用いて表現しました。
詳しくは、スペクトル感度φとRGBスペクトルの行列を用いて、
R_i = ∫φ_i I_r dλ
G_i = ∫φ_i I_g dλ
B_i = ∫φ_i I_b dλ
(el em es)(R G B) ( (R G B)^-1 (φl φm φs)^T )
と計算し、最後の括弧を出力したものとなります。
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