GB2023297B - Photographic printing with colour filters - Google Patents

Photographic printing with colour filters

Info

Publication number
GB2023297B
GB2023297B GB7920949A GB7920949A GB2023297B GB 2023297 B GB2023297 B GB 2023297B GB 7920949 A GB7920949 A GB 7920949A GB 7920949 A GB7920949 A GB 7920949A GB 2023297 B GB2023297 B GB 2023297B
Authority
GB
United Kingdom
Prior art keywords
photographic printing
colour filters
colour
filters
photographic
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
GB7920949A
Other versions
GB2023297A (en
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.)
Novartis AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Priority to GB7920949A priority Critical patent/GB2023297B/en
Publication of GB2023297A publication Critical patent/GB2023297A/en
Application granted granted Critical
Publication of GB2023297B publication Critical patent/GB2023297B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/545—Lamp housings; Illuminating means for enlargers
    • G03B27/547—Lamp housings; Illuminating means for enlargers colour mixing heads
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/727—Optical projection devices wherein the contrast is controlled optically (e.g. uniform exposure, two colour exposure on variable contrast sensitive material)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Projection-Type Copiers In General (AREA)
GB7920949A 1978-06-19 1979-06-15 Photographic printing with colour filters Expired GB2023297B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7920949A GB2023297B (en) 1978-06-19 1979-06-15 Photographic printing with colour filters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7827327 1978-06-19
GB7920949A GB2023297B (en) 1978-06-19 1979-06-15 Photographic printing with colour filters

Publications (2)

Publication Number Publication Date
GB2023297A GB2023297A (en) 1979-12-28
GB2023297B true GB2023297B (en) 1982-08-04

Family

ID=26268010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7920949A Expired GB2023297B (en) 1978-06-19 1979-06-15 Photographic printing with colour filters

Country Status (1)

Country Link
GB (1) GB2023297B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228561A (en) * 1988-11-09 1990-08-29 Stuart Patrick Richards Variable colour light

Also Published As

Publication number Publication date
GB2023297A (en) 1979-12-28

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960615