العلاقة بين أصل اللون ، وتشبعه وفقا لطريقة ( i . C. I ) .. كتاب التصوير الملون

I.C.: The relationship between the origin of the color and its saturation according to the (...) method.

D, for example, and the green color with a light wavelength of 5461, and the blue color with a light wavelength of 4358. If we symbolize red with the point (H), green with the point (Z), and blue with the point (S) (in Figure 24, page 93), then connect these points, it will We have a triangular shape. And we will agree that any point located on the line connecting any two colors is indicative of a new color that resulted from mixing the two chosen colors. Accordingly, the line includes (sacrifice) all colors that can contain appropriate amounts of red and green. Origins consist of blending

And where the yellow rays are formed from mixing red with green, so the point (No.

Green) We will also agree that if the point falls on a side near one of the corners of the triangle, this indicates an increase in the percentage of the chosen color closest to it. For example, it is inferred from the occurrence of the point (No. Point (h) indicates that the percentage of red is greater than green, and therefore point (No. (1) represents orange, as it is roughly in the middle of the distance between red and yellow, while we infer from the location of point No. 3 on the same side and near point (Z). representing green, with point (No. 3) representing a green color similar to yellow.

In the same way, we find that the rib (QZ) represents the group of colors that can arise from mixing different proportions of blue and green, so point 4) represents the Cyan color resulting from mixing the two previous colors.

Likewise, the rib (QH) represents the location of all the colors that can arise from mixing the two colors red with blue, so the point (No. 5) represents the scarlet color, for example. It is noted that this line does not represent colors found in the spectrum in nature, as there are no colors in the spectrum resulting from mixing red with blue or violet, and this line is known as the “purple line.”

We have noticed so far that all the points located on the same sides of the triangle will represent only the colors that can result from adding only two of the primary colors (red - green - blue), as for those colors that can result from mixing different proportions of colors The first three together will not lie on the sides of the triangle itself, but rather lie within this triangle.
green (11 ang)

orange

red (2.1 ang)

Blue (4358A)

(Fig. 24). The relationship between the origin of the color and its saturation according to the method of Al. . .

And if we connect a line between the point (s) that represents blue with the point (No. 2) that represents yellow (i.e. a mixture of red and green), then any point on this new intermediate line (s - 2) must represent the color resulting from the mixing of the primary colors The three. Therefore, it is imperative that the white color fall on this line at an intermediate point such as (Z), as the white color is nothing more than a mixture of these three colours. Likewise, any point located within this triangle must be representative of a mixture of the three chosen primary colours.

And if we connect a line between point (i) representing white and point (z) representing green, then any point located on this line will be like point (No. (6) representing green mixed with white color. The closer the point is to (i) (such as Point No. (7) indicates that the color is greenish-white

And assuming that the color is that we have extended a derivative from point (H) to point No. 7, which represents the pale green color, and we connected it until it converges with the side (SZ) at point No. 9 (which represents a bluish-green color), here we can deduce the pale green ) represented by point number (7) can result from mixing any of the colors that we show in the following two equations: - Pale green (7) = spectral green + white. Pale green (7) = bluish green (point (9) + a little red). There is no doubt that the reader has deduced from the previous explanation the following: - (a) that the three colors that lie in the corners of the triangle Z, S, and H are the colors of A pure spectral primacy that reaches the maximum degree of commonality (b) The sides of the triangle are the boundaries separating the undersaturated colors (which lie within the borders of the triangle) and the highly saturated colors (which must lie outside the borders of the sides of the triangle).

(so the green will be dull), while if the middle point is close to the green side, Z (such as point number (8), this will indicate an increase in the saturation of the green color, and the green color will have reached its maximum saturation when the point is in the place of (Z). We impure it.

If we extend a straight line from point (Z) to point number (10) outside the triangle S, passing through point (No. (4), then any point located on line (Z) will be representative of a blue-green color Cyan mixed with a percentage of white It is a pale blue-green color of little saturation.In contrast, the degree of color saturation increases as the point is farther away from the center (Z) representing white, and the Cyan color has reached its maximum saturation when it reaches a point outside the triangle such as the point (No. 10) because The three sides of the triangle
It is the boundary separating the colors mixed with low saturation white and those highly saturated colors that are completely devoid of white. In the same way, we find that all the pure spectral colors resulting from mixing two primary colors must lie outside the triangle and at a small distance from its sides, except for the pure colors (red - green - blue) which are completely located in the points h, z, s 1

(i.e. vertices of a triangle).