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 sourceInfo
- 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
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)
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) |
-
1924
- 1924-03-01 DE DED45044D patent/DE432197C/en not_active Expired
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