DE432197C - Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source - Google Patents

Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source

Info

Publication number
DE432197C
DE432197C DED45044D DED0045044D DE432197C DE 432197 C DE432197 C DE 432197C DE D45044 D DED45044 D DE D45044D DE D0045044 D DED0045044 D DE D0045044D DE 432197 C DE432197 C DE 432197C
Authority
DE
Germany
Prior art keywords
light source
contrast effect
graphically
original images
electrical light
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
DED45044D
Other languages
German (de)
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.)
HERMANN DEDERICHS
Original Assignee
HERMANN DEDERICHS
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 HERMANN DEDERICHS filed Critical HERMANN DEDERICHS
Priority to DED45044D priority Critical patent/DE432197C/en
Application granted granted Critical
Publication of DE432197C publication Critical patent/DE432197C/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
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Einrichtung zum unmittelbar erkennbaren Verstärken der Kontrastwirkung photographisch wiederzugebender Urbilder unter Anwendung einer elektrischen Lichtquelle. Wenn eine Zeichnung, ausgebleichte Photographie o. dgl. bei einer bestimmten Beleuchtung für das Auge die stärksten Kontraste zwischen der Unterlage (Papier) und den eigentlichen Zeichnungsstellen aufweist, so ergibt sie - mindestens für bestimmte lichtempfindliche Schichten - bei derselben Beleuchtung auch bei der Aufnahme die stärksten Kontraste. Die Erfindung betrifft eine Einrichtung, welche die Benutzung dieser Erscheinung in vorteilhafter Weise ermöglicht. .Device for immediately recognizable enhancement of the contrast effect original images to be reproduced photographically using an electric light source. If a drawing, faded photograph or the like. With a certain lighting for the eye the strongest contrasts between the base (paper) and the actual If there are drawing points, it results - at least for certain light-sensitive ones Layers - with the same lighting, the strongest contrasts also when taking the picture. The invention relates to a device which makes use of this phenomenon made possible in an advantageous manner. .

Gemäß der Erfindung wird die unmittelbare Beobachtung des Verlaufs der Kontrastzu- oder -abnahme dadurch wesentlich vereinfacht; daß zum Beleuchten eine elektrische Lichtquelle benutzt wird, bei welcher durch Verstellen des Schalters eines die Temperatur des Leuchtkörpers ändernden Reglerwiderstandes der Gehalt der Lichtquelle an photochemisch wirksamen Strahlen nach Bedarf verstärkt oder abgeschwächt wird. Durch Regeln der gegen das Urbild zu sendenden wirksamen Strahlen vermag man das Wiedergabebild dabei für das Auge unmittelbar erkennbar so einzustellen, daß es den aus dem Original zu erzielenden größtmöglichsten Kontrastreichtum aufzuweisen hat. Man hat es dabei in der Hand, je nach der gewünschten Bildwirkung den Kontrastreichtum des Urbildes in dem Wiedergabebild mehr oder weniger hervortreten zu lassen. Statt einer Lichtquelle mit regelbarer Spannung kann man auch eine Reihe von Lampen anwenden, welche mit gegeneinander abgestuften Temperaturen brennen und aus diesen mittels eines Schalters die für das jeweilige Urbild die wirkungsvollsten Kontraste ergebende Lichtquelle auswählen.According to the invention, the direct observation of the course the increase or decrease in contrast is thereby significantly simplified; that for lighting an electric light source is used, in which by moving the switch a regulator resistor that changes the temperature of the filament, the content of the Light source of photochemically effective rays intensified or weakened as required will. One can regulate the effective rays to be sent against the archetype adjust the playback image so that it is immediately recognizable to the eye it has the greatest possible richness of contrast that can be achieved from the original Has. You have it in your hand, depending on the desired image effect, the richness of contrast to allow the original image to emerge more or less in the reproduced image. Instead of a light source with adjustable voltage one can also use a number of lamps, which burn with mutually graded temperatures and from these by means of a switch that gives the most effective contrasts for the respective archetype Select light source.

Claims (1)

PATENT-ANspp,uci-l: Einrichtung zum unmittelbar erkennbaren Verstärken der Kontrastwirkung photographisch wiederzugebender Urbilder unter Anwendung einer elektrischen Lichtquelle, dadurch gekennzeichnet, daß durch einen die Temperatur des Leuchtkörpers verändernden Regelwiderstand die Kontrastwirkung des Urbildes einstellbar ist. b2RrtN. ctbRUCHT IN DER @@:ICHSbaVCtcfac@l.PATENT-ANspp, uci-l: Device for the directly recognizable enhancement of the contrast effect of original images to be reproduced photographically using an electrical light source, characterized in that the contrast effect of the original image can be set by means of a regulating resistor which changes the temperature of the luminous element. b2RrtN. ctbRUCHT IN THE @@: ICHSbaVCtcfac @ l.
DED45044D 1924-03-01 1924-03-01 Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source Expired DE432197C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED45044D DE432197C (en) 1924-03-01 1924-03-01 Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED45044D DE432197C (en) 1924-03-01 1924-03-01 Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source

Publications (1)

Publication Number Publication Date
DE432197C true DE432197C (en) 1926-07-28

Family

ID=7048735

Family Applications (1)

Application Number Title Priority Date Filing Date
DED45044D Expired DE432197C (en) 1924-03-01 1924-03-01 Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source

Country Status (1)

Country Link
DE (1) DE432197C (en)

Similar Documents

Publication Publication Date Title
DE432197C (en) Device for the immediately recognizable increase in the contrast effect of original images to be reproduced photo-graphically using an electrical light source
CH212984A (en) Device for spinning and twisting synthetic threads.
FR788638A (en) Slotted conical head pliers
Bird Ageing Bids by Skull Ossification
DE914288C (en) Method for operating an electron microscope equipped with an aperture diaphragm, in particular an overmicroscope
FR774438A (en) Printing blanket and its manufacturing process
AT102889B (en) Electrical apparatus for generating flashing light which is used for periodic illumination of rapidly rotating mechanical organs.
DE335486C (en) Transformer for direct and alternating current connection with self-interruption, especially for medical purposes
DE359187C (en) Device for showing individual images by means of a cinematograph
DE947097C (en) Drop-out delayed DC relay
DE414358C (en) Fireworks exhibition
DE574458C (en) Thermostat arrangement for monitoring the correct position of a radiation source, in particular the arc of an arc lamp
CH206946A (en) Method and device for the production of large artificial silk strands.
DE544158C (en) Device for facilitating the further processing of positive cinema films after developing
DE1757931U (en) DEVICE FOR COPYING COLOR PHOTOS.
DE880334C (en) Device for the periodic interruption of a circuit using a bimetal spring
AT131267B (en) Method and device for adjusting the lamps of cinema playback apparatus.
GB435105A (en) Improvements in or connected with sun screens, goggles or the like
DE385265C (en) Translucent lock for demonstration cinematograph
DE533118C (en) Multi-flame magnesium lamp
DE713438C (en) Film copying machine with a plurality of fixed step resistors in the circuit of the copying lamp for regulating the brightness levels of the lamp
DE324059C (en) Copier
DE391418C (en) Device for making multiple photographic copies
DE350900C (en) Device for making contact by means of selenium cells through the visible appearance of an object in a room of unsteady light
DE388873C (en) Device for operational switching on and off and regulating electrical currents