التصوير الملون وفقا لنظرية الإضافة مع استخدام أفلام خاصة غير مسطحة بل مموجة .

Color photography according to the additive theory with the use of special films

flat but corrugated

This method is known as the Lenticular System, and this type of film was initially produced by Kodak factories in 1928 under the name Kodacolor Lenticular) as 16 mm films, then 35 mm films, then Agfa factories produced similar films after that.

These films (which are of the panchromatic film family) are characterized by the fact that one of the surfaces of the film’s support, which is the back surface far from the sensitive side, was not completely flat, but rather wavelike, as it works like very small semi-cylindrical lenticels, so that one image of the 16 mm film includes Approximately 200 lentils, each with a width of 28. R mll - 43. R . millimeter

In front of the photographic lens, there are three filters as connected strips that cover the surface of the lens (Fig. 44).

Each lens would be on the sensitive surface a part of the final big picture, and this part would consist of three very fine strips, one of which represents the part that was recorded through the blue filter, the second represents what was recorded through the green filter, and the third represents what was recorded through the red filter. through the filter

The visible color image according to this method is similar to that recorded on the Mozaic Sereen films (previously we talked about

about it) with a difference in the following points: (1) There is absolutely no connection between these films and those currently available under the same name “Coda Color”.
(1) The images that we are discussing now consist of very fine successive strips of color, one of which is red, the second is green, and the third is blue. As for those that are recorded on the film with a mosaic curtain, they consist of very precise areas colored with the same primary colors mentioned above. (B) Instead of the colored filter elements being placed inside the film (as is the case in the films that carry the Mosaic curtain, the filters in our current method are placed in front of the lens as three colored and connected strips, so the lenses transmit what passes through the colored filters to be recorded on the film (Fig. 44). And after showing these films - according to the method of displaying the messages, they become valid for viewing through the projector. At the stage of showing the film, the light rays emitted from the projector pass through the film, then to the lens of the projector, and then pass through the three filters located in front of the projection lens (Fig. 45). (4) At the imaging stage
It must: Narrow: A - It is usual for the focal length of the projector lens to be longer than the focal length of the photographic lens, as this results in a difference in the path of the rays when displaying the image than it was when photographing, which would: The colors of the image displayed on the screen, so it becomes necessary to add other optical pieces (lenses) in front of the projector lens to adjust its focal length to match the focal length of the imaging lens. 2- The narrowness or wideness of the point from which the light is emitted in the projector has a great influence on the correctness of the colors, and its correctness also depends on the ability to place the light source in the correct position in relation to the film, and in general: the area from which the light is emitted is large until it is close to a point. We wanted the light source to be perfect, which can be difficult to achieve in practice

The following is a summary of the difficulties associated with color photography using a lenticular film method, which led to the abandonment of this method, and thus to the termination of production.

These movies.

These films, during the filming stage, require a large exposure. It was appropriate for her to use a lens with aperture of 2: when photographing in the bright sun, as it required - in the projection stage - that the light source be very strong with a decrease in the area of ​​​​the projection screen to approximately the usual screen area of ​​the black and white film of the same size). An explanation of this is given, for example, by an area of ​​a color (let it be blue) located on the body being photographed, and then the following occurs: - (1) The blue light rays are reflected from this area and fall on the lens of the camera, passing only through the blue filter located in front of the lens, which occupies - At most - a third of the lens aperture area. This means that each of the colors of the light rays reflected from the objects will only pass through

One-third of the aperture of the lens, and in practice this area is less than a third, and it may be a quarter of the aperture’s area, which means that the actual aperture has decreased to approximately a quarter.

(b) When light rays pass through the filter, part of them is absorbed by the filter, and this requires an increase in exposure. (C) The support of the film absorbs part of the rays passing through it, and another part of it is reflected on the surfaces of the lentils.

For the aforementioned reasons, we find that a lot of light rays were lost in the previous stages, and the amount of rays that affect the film is almost equal to those that would have passed through a lens of 48 in a normal camera with a solid (black metabolite) film.