SU124303A1 - The method of color and black-and-white combined shooting with movable masking in polarized light - Google Patents

Description

The known methods of shooting color and black-and-white combined film frames with motionless masking in polarized light are based on the use of a large brightness interval between the polarized light of the background screen and the light reflected from the actor due to the different reflecting characteristics of the actor and the background. The background (aluminized screen) does not depolarize the polarized light from the illuminator, and the face of the actor and his clothes are depolarized by the light from the other illuminator through the floor, due to diffuse reflection, because of the separation of the background through the image of the actor. The light fluxes inside the camera use an optical system that shares the same actor and background rays. Equivalence of these rays makes it necessary to have the brightness of the background screen 50-60 times higher than the brightness of a; tera, and the brightness of the actor is 3-4 times higher than that found during normal shooting.

The described shooting method allows to reduce the levels of background and actor brightness and to increase the purity of the separation of energy flows that form the optical image of the actor and his silhouette. This is achieved by separating the rays of the background and the actor directly in the camera's light-splitting system. The light-splitting unit is wholly or partially made of optically active materials, and to achieve normal color reproduction, a color film is used when shooting, having one or more additional photosensitive layers underneath the main film layers (used for normal color shots) or on the free side of the substrate.

The drawing shows a diagram explaining the essence of the proposed method.

Polarized luminous flux from the background 1 and the usual light from the actor 2 fall on the light-splitting prism 3 of two-sided exposure)) and # 124303

Vanes and passes to the face 4, covered with optically active substances, from which they are partially reflected, partially extinguished and partially passed. The reflected part of the luminous flux of the background illumination and the actor falls on the repetitive polarizing face 5 of the block, also covered with optically active substances, where the purity of the polarization and the background image and the actor increases; the intensity of the actor's light decreases dramatically, and the background light reproduces the positive positive 6 (or exposes the masking film) to the color film of the double-sided exposure 7. As a result, the intensity of the actor's light on this face decreases on the background side of the block. object of shooting between the background and the actor. After passing through face 4, a portion of the light flux of the background illumination, if it has a practically noticeable value, is quenched by a polar filter installed in front of the film, and the actor rays having a polarization plane perpendicular to the plane of the background rays expose the negative film 7 to form a latent image of the actor .

Due to the force of the metric of the ray path in both halves of the optical block, the contrasional image printed by the background rays that brighten one half of the block will be superimposed on the image of the actor formed by the rays that brighten the second half of the block, resulting in either a combined transparent frame or stubby blanks of the wandering mask (negative and countermask). The optical light-splitting unit can be entirely made of optically active materials, for example, from Iceland shpat. To obtain a combined frame, a color film of double-sided exposure is used, made by watering one or more additional photosensitive layers under the main layers of the film (used for normal color photography) or on the free side of the substrate. Using the proposed method of shooting expands the creative possibilities of combined shots in cinematography.

Subject invention

Claims (3)

1. A method of color and black-and-white combined shooting with movable marking 6 polarized light, characterized in that, in order to reduce the levels of illumination of the actor's scene and the background screen, as well as to increase the purity of the separation of the energy flows forming the optical images of the actor and its silhouette, the separation of these flows along their plane of polarization is carried out directly in the camera's light-splitting system. 2. A device for carrying out the method of claim 1, made in the form of a double-sided exposure camera with an optical light-dilution unit, characterized in that said unit is entirely or partially made of optically active materials. 3. Application for performing the method according to claim 1 of a color film, characterized in that, in order to achieve normal color reproduction, the film has one or more additional photosensitive layers underneath the main layers of the film (used for normal color removals, approx.) Or the free side of the substrate.