الاعتبارات التي تراعي في صناعة الأفلام الملونة المتعددة الطبقات ..

Some considerations taken into account in the manufacture of multi-layer color films:

There are considerations that the manufacturer pays attention to when making this type of film.

The following is a summary of these considerations:

(1) It must be each of the three sensitive layers

Sensitive to only a third of the visible spectrum. If this is not possible with extreme accuracy, then no

It is okay to use an optical filter to absorb part of the non-radiation

It is shown in the desired in passing. This is what we learned earlier when we mentioned that the yellow filter must be placed next to the upper layer sensitive to blue rays, as shown in Figure 57, page 205, or in the same layer (Figure 58, page 205). (b) Each of the sensitive layers must be as thin and transparent as possible, otherwise it is certain that the light rays will suffer from undesirable scattering through the thickness of the sensitive layers, so the sharpness of the image will decrease on one side, and the light energy that reaches the layer will decrease. The lower sensitivity will be underexposed. (c) Since we knew - from the foregoing - that it is necessary to place a yellow filter next to the upper sensitive layer or within this same layer, and the film may also have an anti-halation layer, so it is necessary that each of them be made of refractory materials. To disappear during the stages of washing or exposure, without affecting any bad effect on the colors of the images or on the exposure solutions.

(d) Despite the difference of the three sensitive layers in their spectral sensitivity, they must be similar in their characteristics at the time of exposure, such as the three reaching similar degrees of intensity and contrast after the first exposure process, as they will be exposed at the same time and in one solution.

(e) There must be in each sensitive layer other materials that would create - in the color rendering stage - dyes different in color (either yellow, scarlet, or cyan) from what arises in the other two sensitive layers.

These materials that form these pigments are known as color problems or color components, or Color Couplers or Color Formers, and you will talk about them as follows: