SU1203474A1 - Method of masking colour separation negatives - Google Patents

Abstract

The invention relates to photo reproduction processes, in particular, to methods for masking color separations of raster negatives produced by direct screening. The aim of the invention is to reduce the consumption of photographic materials and reduce the masking process. A color-correcting mask uniform for all negatives is made on a multilayer masking film. By exposing the panchromatic film to an image of the original, combined with a single mask through a yellow light filter, a negative for black ink is made. Separated raster negatives of yellow, magenta, and cyan inks are obtained by exposing the original, combined with a single mask through appropriate light filters, and additionally exposing a single mask with a yellow light filter. As a result, on color-separated raster negatives of yellow, magenta, and cyan colors, there is a reduction of transparent raster elements in the neutral gray areas of the image in the ratio in which these areas are reproduced on the color separation negative obtained by the yellow light filter. S (L to about with

Description

The invention relates to photographic reproduction processes, in particular, to methods for masking color-separated raster negatives produced by direct screening.

The purpose of the present invention is to reduce the consumption of photographic materials and reduce the process of making photoforms.

According to the proposed method, the masking is performed as follows.

A common color-correcting mask on a multi-C .. / 1OW masking film is made in common for 1 tatypels. Then a negative for black paint is made by exposing the panchromatic film with the image of the original, combined with a common mask through the same: 1st optical filter. Color-separated raster negatives of yellow, purple and go are made. | Slaughter of colors with the help of two expositions: 1:, s - the main exonnier (.1 image: m of the original combined with the total mass) vi cooTBeTCTBeiiHo through blue, blue; 1eny, and kr; i1) 1y svetophy1 / gy, added with the image of a common mask rs cs s 3 yellow filter filter.

The optical image of the general mask, φ () |), generated by a yellow light filter (p-1 () | singing to the panchromatic foil. On | "KG K) color separations are made; iieiuia. JbHO made for a yellow light filter on panchromatic film.

This way (as a result of p e. Iiinoi o ekeponirog-ann by the image of cg, et; 1C; th mask through ke, black light filter on the central banker | -unit raster non-latin yellow, greener and -blue paint occurs Clear raster elements in the neutral gray areas of the image in the ratio in which these areas are reproduced on the well-separated negative obtained from the same light filter.

Example. By contact copying an image of an original (color slide) onto a special multi-layer masking 1. MP-1 film, an obtuer is made) for all negatives a color-correcting mask. Perforation of the perforation holes is made to keep the image register on the original floor and the mask. After chemical-photographic processing, the mask is strung on the register () you and the photographic enlarger, and the color original is scanned onto the original, loc; ie, focusing on the format sharpness by F-112 G: h ; color-separated raster negatives of L selta, magenta, cyan and black colors. Color separation raster negative black paint is made by exposing panchromatic film

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the image of the original, combined with the mask through a yellow light filter and a contact raster. Exposure time 120 s. Color-separated raster negatives of yellow, magenta, and blue inks are made by exposing pan-chromatic films through coarse screenings with the help of two exposures, in the process of the first of them they are exposed with the image of the original, combined with a mask

0, respectively, through the blue, green and red) U1 light filters, and in npoivVLce the second exposure is additionally exposed with only one image of the color-correcting mask behind the yellow light filter. Before each additional exposure with the original document holder, a color original is removed.

The duration of the first exposure in the manufacture of separations of negatives: yellow through a blue light filter

0 320 s, nurpurpy paint through a green light filter 380 e, blue paint through a red light filter 240 s. O) the duration of the second exposure (additional) of each color separation of the first negative through the yellow light filter is 1, 2, and 3 s, respectively.

After chemical and photographic processing (3.5 min in IP-b and fixation for 5 min in acidic fixation), a set of color-separated negatives is obtained;) negatives of yellow, industrial and blue inks are corrected for xpON aTH4ecKnM and achromatic colors.

When using the image of a color mask to mask the decrease of chromatic inks in the neutral: o-se) image areas, the use of a special additional mask is no longer possible, as a result, the consumption of photographic materials is reduced and the productivity of labor is reduced; Pz1x photoforms.

Claims (1)

Invention Formula The method of masking the separations of its fragrances is preferable by attenuation. 5 chromatic colors in the neutral (o-gray areas of the image, including the manufacture of a color-correcting mask that is uniform for all negatives, the main exposure of a photosensitive material to the image of the original and a single mask combined with it through a corresponding light filter and an additional inducing effect through a mask A picture that differs from that. In order to reduce consumption (} 5 material. 1 and reduce the process of preparing photoforms, additional exposure is carried out through a single color correction mask and yellow light (|) iltr. 0 0