مقدمة الجزء الثاني .. كتاب التصوير الملون

Presenter of the second part

In the year 1800 Clark Maxwell laid down a rule

It is the cornerstone of color photography - and it remains valid to this day, and it is a summary of his long experiments with colors and he decided: «That by adding three colors of rays to each other and mixing them in specific proportions, any color that is required to be formed can be produced in order to be matched with a specific predetermined color. . And the colors of the rays identified by «Maxwell», are what we call today «primary colours, namely red, green, and blue».

At that time, Maxwell decided to add his colors to each other by projecting them onto a black surface so that it would not have any effect on the colors falling on it, and its color would not affect the judgment of the results of combining the colors of the rays. And since the perfect black color means that there are no rays reflected at all, therefore, any secondary color that appears on this surface after the primary colors have been projected onto each other, will only be due to the addition of the colors of the rays. . with each other . However, if Maxwell had started his experiments by projecting the primary rays onto a black surface, this does not mean that until today, as the results that Maxwell reached remain correct even if the rays fell on a completely white surface, such as a movie screen, or even if we were not There is a display screen at all, rather the rays fell, adding some of them, the necessity of sticking to this color

With some on the human retina. And in 1869 he declared-

Du Hauron reported that he had benefited from the results of Maxwell's research in producing portraits

Colored according to a new theory, which is the Subtractive theory.

In order to make it easier for us to distinguish between the two theories, we suppose that the subject being photographed has an area of ​​yellow color, so what are the ways by which this color can be formed in the image? . In response we say that: - -