JP3743928B2 - A method to reproduce the hue with black and white film and a magenta filter. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a two-color method among color photograph types. It is much simpler than the Land color and can accurately reproduce the hue.
[0002]
[Prior art]
The conventional technique is a method of copying with a color film based on the principle of Young Helmholtz's three primary colors and reproducing it with a color film.
This theory is based on the theory that among the retinal photoreceptor cells, the color vision is only in the cones and the rod is only in the optical sense.
[0003]
Land tries to reproduce natural colors using a red filter and a green filter, but the operation is complicated, and the color map of Land is very complicated and difficult to follow up. This is because the selection of the filter was wrong, and the excitement of the retinal photoreceptor cells was not taken into account and the rest was taken into consideration.
[0004]
[Problems to be solved by the invention]
The conventional method is complicated and accurate hue reproduction is difficult. (For example, there is a difference between natural hues and hues of color photographs and color television). According to the present invention, it is possible to reproduce the hue of a large amount of information easily and accurately.
Moreover, it is an invention that can solve the fundamental principle of color vision.
[0005]
[Means for Solving the Problems]
It was invented that a difference in hue occurs between the rate of excitement of rods of retinal photoreceptors (excited in white) and cones (excited by reddish purple light). That is, a difference in hue occurs depending on the photosensitive density ratio of the black and white film. The process of the present invention will be described below.
[0006]
Using a color chart drawn in poster colors in blue, red, yellow, green, magenta, white, black and concentric circles as the subject, this was photographed with black and white film without a filter. 33 is photographed with black and white film.
The latter exposure time is required to be about ²⁶ times the exposure time required for the former proper photographing.
Each negative film is a black-and-white film, and a positive film is produced by inverting the magnification to 1.0 under the same illumination using an auto bellows and a slide copier.
The following two projectors were used as the light source for photographing the subject, inverting the negative film, and reproducing the image.
A positive film that was shot without a filter and turned upside down had no filter. A positive film obtained by reversing a negative film made through No. 33 is NO. Through 33, each is projected onto a white screen (such as Kent paper) at a distance of 60 to 70 cm with the following two projectors of the same type as shown below to focus (FIG. 3).
Even if these images are overlaid, only magenta is seen. Just before the projector, white light passes through the slit (A) and red-purple light passes through the slit (B) of the aluminum disc [Fig. When the image is intermittently illuminated by rotating it at a rate of about 4 times per second (decelerated with a Tamiya model high-power gearbox HE etc.), the normal color gamut will have the same color as the subject's hue on the screen every second. It can be seen blinking about 4 times. If this is expressed as reproduction of hue, the hue of the subject is reproduced.
[0007]
Individual retinal photoreceptor cells receive light, excitement, extinction of excitement, and excitement pause when they are irradiated with light rays, so rotate the disc with a slit between both projectors and the screen [Figure 2] By intermittently irradiating the image, it is possible to give the retinal photoreceptors sufficient excitement and excitement pause time.
When the images are superimposed in this state, the hue of the subject is reproduced on the screen [Figure 1].
[0008]
Two types of positive film, no filter and no. The hue can be reproduced by projecting through 33, superimposing these images, and rotating the disc with the slit in FIG. 2 in front of the projector. This reproduced hue can never be photographed as it looks with existing color film.
This is because the film that has been released is based on the three primary color theory.
If a film based on the present invention can be developed, photography is possible.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A subject is irradiated from 45 degrees obliquely from the left and right front sides using two identical slide projectors (cabin CS15), and this is used as a light source and photographed with a black and white film without a filter.
(Fuji film HR2, black and white film was used as the film.)
On the other hand, no. Wear 33 filters and shoot with black and white film.
Create a positive film by inverting each negative film with a black and white film.
[0010]
No filter in the dark room. 33 is worn and each is projected by the above slide projector. A disk with a slit (A) and a slit (B) between the screen and the projector (Fig. 2) is rotated about 4 times per second. The slit (A) is 3 degrees wide and the slit (B) is 30 degrees wide. This angle may be (A) 4 degrees for the slit width and (B) 40 degrees for the slit width.
[0011]
The angle of the slit width is an example, and A: B = 1: 10.
The slit width is an angle that is proportional to the ratio of the energy of both rays that white light excites the rod-shaped body and red-violet light excites the cone-shaped body.
However, it is desirable that the slit (A) is narrower than 9 degrees and the slit (B) is narrower than 90 degrees. The reason is that a sufficient excitement of the retinal photoreceptor cells and a pause time are required.
When the images are overlaid, the hue of the subject is reproduced [Figure 1]. FIG. 3 is a conceptual diagram of this experiment as seen from above.
[0012]
When the rod is excited, it feels white. When the rod and cone are both weak, it feels black.
[0013]
【The invention's effect】
In the present invention, it is assumed that a hue is sensed at the rate of excitement of two types of cells in the retina, that is, rods and cones.
This invention is considered to be a revolutionary invention in terms of color physiology, in which the reproduction of hue is much more accurate than the use of the three primary color theory. By using this principle, it is possible to accurately reproduce the hue with only black and white film.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of the invention.
FIG. 2 is a disk diagram.
FIG. 3 Experimental method. It is the conceptual diagram which looked at the reproduction experiment of hue from the top.
[Explanation of symbols]
Slit (A) width 3 degrees, slit (B) width 30 degrees.

Claims (1)

Method for reproducing hue with black-and-white film and reddish purple filter comprising the following steps 1 and 2. Using a black and white film on a subject colored in various hues, no filter and reddish purple Kodak Ratten Filter No. No. 33 (hereinafter referred to as No. 33) is photographed, and both negative films are reversed with a black and white film to produce a positive film.
2. Each positive film was filtered with two identical projectors, with no filter. 33 is projected onto the screen, and the images are intermittently irradiated by rotating a disc having slits (A) and (B) between the projector and the screen, and both images are projected. To reproduce the hue of the subject.

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