إعداد نسخ شفافة سالبة أو موجبة من الصور الشفافة الملونة .. كتاب التصوير الملون

Chapter Ten

Prepare negative or positive transparent copies of color transparencies

For many photographic purposes, transparent duplicates of color transparencies are required

D Projection and it may require that these copies be in color, or be black and white. This process is of course (Printing) or (Earning) or (Reproduction) by optical methods, and color sensitive papers are not used as we saw in Chapter Nine Rather, it uses specially prepared raw films for this purpose, and by re-imaging the original transparent images with the use of transmitted light. In Figures 78077, 76 we show some ways to perform this purpose in still photography (non-film). These transparent images may be The original color is negative or positive, and then you can get different copies from it, which we show in the following table: In this section, we will also show the characteristics and methods of showing some films suitable for this purpose.
Notes at the bottom of the opposite page:

(1) This method is known as the positive-positive process to differentiate it from those usual methods known as the “negative-positive process”, which requires that negatives must be prepared first, and then printed on positive films.

(7) Like the materials known as Ansco type printon

A dial that controls space adjustment by raising and lowering the camera

A single-lens 35mm reflex camera that holds negative or positive film

Magnifying glass in front of the viewfinder

used when adjusting the distance

Extra bellows for close-up shooting

The positive or negative transparent image you wish to transfer

A base contains an electronic flash and the light turns on when adjusting the distance. A special button for the electronic flash

(fig. 76)

The Heiland Repronar device is intended for transferring images on 35 mm film of colored or non-color originals. It may also be on 35 mm films or longer than 66 cm. The electronic flash is the source of light in this device. One flash may suffice to perform the correct exposure if the negative image is of medium intensity, or more than one flash if the matter calls for that. Below the transparent image to be transferred is a place for the necessary filters to adjust the colors as required. As the camera operates with a bellows for close up photography or for macrophotographic photography, therefore it is possible by means of this device to transfer a small part of the original onto the film (in the camera) when you wish.

We took the form from: I. Coote. Color Prints, p. 245, 2nd edition
camera.

Camera stand

The transparent image is between two slices of a filter to adjust the color temperature of the rays

Adaptation The correct color temperature of the pen

A white opal glass panel that diffuses light.

The lighthouse has a white inner surface

(Fig. 77)

How to prepare copies of colored positive transparencies using permeate lighting?

The camera is placed in a special holder as shown in the figure, and in front of the lens is placed the “transparent, positive colored image.” If we want the transmission scale to be = 1: 1, then the distance of the image from the lens must be equal to twice the focal length of the lens. An optical filter is placed to adjust the degree The color temperature of the rays emitted by the light source to match the color temperature for which the film was prepared, and between the filter and the light source there is a white glass plate and opal glass to distribute the light.

(fig. 78)

Another way to transmit positively contaminated transparent images is by using a magnifier in which the transparent image is placed, and filters are placed in the path of the rays to adjust the colors as required. As for the colored film on which the image is transferred, it is placed in a camera after removing the lens from it. And the sensitive surface of the film is facing the magnifying lens. It is noted that by this method a certain part of the original positive transparent image can be enlarged, or the original image can be transmitted at a 1:1 transmission scale if we wish.

We took these two shapes from: - Leslie Thomson, Color Photograpby (Transparencies)p. 222.