Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F3/00—Colour separation; Correction of tonal value
  • G03F3/10—Checking the colour or tonal value of separation negatives or positives
  • G03F3/107—Checking the colour or tonal value of separation negatives or positives using silver halide photosensitive materials

Definitions

• the present invention relates to a process for the manufacture of screened colored positive direct-viewing images, which in the printing industry permit the rapid detection of the matching of the component print posiitves which the final printed product will show.
• the color shades of the base colors yellow, magenta and cyan are so controlled by the copying process that they are matched to the printing inks.
• the subject of the invention is, accordingly, a process for the manufacture of a screened, photographic color copy simulating a multi-color print, preferably multicolor oliset print, in which the screened positive color separation components of the original, which appertain to the individual colors, are exposed together with the screened black separation component and, if appropriate, the black separation component alone is additionally exposed onto a light-sensitive positively working colorphotographic material, characterized in that (a) at least one of the color separation components together with (b) the black separation component and (c) at least partially together with at least one of the remaining color separation components, is exposed with the light of the color appertaining to the color separation component (a) onto the light-sensitive color-photographic material, and the material thus exposed is processed to give a screened, pos itive direct-viewing image which possesses base colors matching the printing inks.
• the exposures, without and with a 2nd and optionally 3rd"co1or separation component (c) are computed from the densitometric measurement of the printing ink and from the colors on the photographic copy.
• the procedure followed is thus that, depending on the measured color deviation of the individual base colors of the color proof from the printing ink, a second and, if appropriate, a third color separation screened positive is exposed to a greater or lesser extent together with the color separation positive to be copied, and that this is done in such a way that the proportion of exposure of the additional second or third color separation component with the main color separation component is together as a rule 10 to 100%, preferably 40 to of the total exposure time of the first color separation component.
• the second possibility of adapting the proof to the printing conditions is, in addition to varying the color shades, adjusting the maximum densities of the individual base colors, or reduction, to the print color density.
• an exposure through the black print positive is made with the color filter complementary to the reducing color.
• the exposed material is subsequently developed to give a positive direct-viewing image.
• the process according to the invention is above all suitable for simulating screened multicolor ofiset-printed products.
• Photographic material for the silver dye bleach process has proved particularly advantageous for the process according to the invention, since it permits colored images to be produced wherein the colors correspond relatively well to the printing inks.
• a further advantage of the photographic material for the silver dye bleach process is that it permits positive copies of positive color separation components to be produced with ease.
• the present process is, however, not restricted to photographic material for the silver dye bleach process, and material used, for example, for the dye development process is also suitable.
• the color separation components required for the process according to the invention for example the green, red and blue filter separation component, as well as the black separation component, are produced in the usual and known manner. Since these separation components are in the form of monochrome, and generally black-andwhite, diapositives, the choice of the copying lights in photographic further processing now only depends on the spectral sensitivities of the copying material.
• the color separation component positives which are in most cases black-and-white, correspond to the positives usually employed in screen oifset printing technique. These screen positives are as a rule contact copies or enlargements of screened or continuous-tone separation negatives, and in the cast of continuous-tone negatives a contact screen must be copied with them.
• the continuoustone or screen negatives are produced with color filters,
• the color retouching and correction of the color separation components is adapted to the works colour scale of the For comparison, the printing ink is measured with the photographic color proo with and without mixing-in individual printing works.
• the blue filter positive is combined in register with the black print positive and copied onto the emulsion sensitive to blue, by means of a part exposure with blue light.
• the green filter positive is then added thereto and the second part exposure effected with blue light.
• the green filter positive and the black print positive are used, and for the red exposure the red filter positive is again used with the black print positive.
• the color-photographic material is developed by the silver dye bleach process to give a positive direct-viewing image, which comes close to the printed product produced with the same separation components.
• Example 1 there are 2 exposures using the blue filter onto a photographic material for the silver dye bleach process:
• the green and red exposures remain the same as in Example 1. After the exposures, a positive direct-viewing image is obtained, which comes close to the printed product produced with the same separation components.
• the blue exposure is again subdivided into 40% exposure for the first part exposure of the blue filter positive and black print positive at 60% exposure for the second part exposure, in which blue filter, green filter and red filter positives and the black print positive are used. In this way yellow is mixed into the magenta and cyan color of the color proof.
• Step 5 reduces the maximum density of the cyan layer.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4372016

Family Applications (1)

Country Status (8)

Cited By (7)

Families Citing this family (3)

• 1970
  • 1970-07-24 CH CH1129170A patent/CH545491A/de not_active IP Right Cessation
• 1971
  • 1971-07-12 CA CA117,924A patent/CA941214A/en not_active Expired
  • 1971-07-14 US US00162674A patent/US3796575A/en not_active Expired - Lifetime
  • 1971-07-19 DE DE19712136064 patent/DE2136064A1/de active Pending
  • 1971-07-21 GB GB3428471A patent/GB1328299A/en not_active Expired
  • 1971-07-22 FR FR7126913A patent/FR2103241A5/fr not_active Expired
  • 1971-07-23 BE BE770407A patent/BE770407A/xx unknown
  • 1971-07-23 NL NL7110201A patent/NL7110201A/xx unknown

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