FR837877A - Process for reversing the degree of blackening of positive or negative films - Google Patents

Process for reversing the degree of blackening of positive or negative films

Info

Publication number
FR837877A
FR837877A FR837877DA FR837877A FR 837877 A FR837877 A FR 837877A FR 837877D A FR837877D A FR 837877DA FR 837877 A FR837877 A FR 837877A
Authority
FR
France
Prior art keywords
blackening
reversing
positive
degree
negative films
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
Other languages
French (fr)
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Application granted granted Critical
Publication of FR837877A publication Critical patent/FR837877A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
FR837877D 1937-05-12 1938-05-12 Process for reversing the degree of blackening of positive or negative films Expired FR837877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE514650X 1937-05-12

Publications (1)

Publication Number Publication Date
FR837877A true FR837877A (en) 1939-02-22

Family

ID=6548738

Family Applications (1)

Application Number Title Priority Date Filing Date
FR837877D Expired FR837877A (en) 1937-05-12 1938-05-12 Process for reversing the degree of blackening of positive or negative films

Country Status (2)

Country Link
FR (1) FR837877A (en)
GB (1) GB514650A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958302C (en) * 1953-06-14 1957-02-14 Fernseh Gmbh Circuitry for providing a fixed reference value for black when reversing image signals obtained by scanning photographic negatives
CA1094214A (en) * 1975-08-06 1981-01-20 Harold G. Seer, Jr. Negative gamma circuit

Also Published As

Publication number Publication date
GB514650A (en) 1939-11-14

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