GB473115A - Improvements in the production of photographic pictures - Google Patents

Improvements in the production of photographic pictures

Info

Publication number
GB473115A
GB473115A GB34053/36A GB3405336A GB473115A GB 473115 A GB473115 A GB 473115A GB 34053/36 A GB34053/36 A GB 34053/36A GB 3405336 A GB3405336 A GB 3405336A GB 473115 A GB473115 A GB 473115A
Authority
GB
United Kingdom
Prior art keywords
blackening
curve
region
gradation
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB34053/36A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOOCIETY OF CHEMICAL INDUSTRY
Original Assignee
SOOCIETY OF CHEMICAL INDUSTRY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SOOCIETY OF CHEMICAL INDUSTRY filed Critical SOOCIETY OF CHEMICAL INDUSTRY
Publication of GB473115A publication Critical patent/GB473115A/en
Expired legal-status Critical Current

Links

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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting

Landscapes

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

Abstract

473,115. Photographic emulsions and printing-processes. SOC. OF CHEMICAL INDUSTRY IN BASLE. Dec. 11, 1936, Nos. 34053 and 34054. Convention dates, Dec. 11, 1935 and Dec. 10, 1936. Drawings to Specification. [Class 98 (ii)] In the production of photographic pictures by printing a negative image on to a positive light-sensitive emulsion layer, negative and positive emulsion layers are used in at least one of which the gradation curve is steeper in the region of little blackening than in the region of much blackening and in which the range of blackening of the negative material corresponds with the range of intensity of the positive material. The gradation curves may be similar to a parabola or a portion of a hyperbola. The layers may be so chosen that the gamma of the resulting image curve of the shadows and the gamma of the high lights are greater than the gamma of the image curve of the middle tones. A negative produced on an emulsion of which the gradation curve in the region of little blackening is steeper than in the region of much blackening may be printed on a positive emulsion of which the gradation curve in the regions of little and much blackening is steeper than in the middle tones. The layers may be so chosen that the threshold value of the resulting image curve in the various intensity regions remains the same. The emulsions may be prepared as described in Specification 428,305. The gradation curves may be modified by suitable development, clearing, reducing or intensifying.
GB34053/36A 1935-12-11 1936-12-11 Improvements in the production of photographic pictures Expired GB473115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH473115X 1935-12-11

Publications (1)

Publication Number Publication Date
GB473115A true GB473115A (en) 1937-10-06

Family

ID=4516064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34053/36A Expired GB473115A (en) 1935-12-11 1936-12-11 Improvements in the production of photographic pictures

Country Status (1)

Country Link
GB (1) GB473115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515846A (en) * 1947-04-29 1950-07-18 Du Pont Method of reproducing pictures
US2635047A (en) * 1949-07-27 1953-04-14 Warner Bros Method of processing sound film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515846A (en) * 1947-04-29 1950-07-18 Du Pont Method of reproducing pictures
US2635047A (en) * 1949-07-27 1953-04-14 Warner Bros Method of processing sound film

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