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- The light sensitivity of photographic paper--that is, its ability to pick up an image from an image projected onto it from a negative and retain it--seems baffling unless you understand what is happening to the paper on a chemical level. The presence of certain chemicals on photographic paper affect how an image appears, how fast it takes the image to appear on the paper, and even whether the paper will accept a color or black and white image.
- Chemical Coating
- It is the layer of chemicals coating photographic paper that provides light sensitive properties. Silver halides--or the compound that is created when silver is combined with one of two types of silver fluorides, chloride, silver bromide or iodide--are suspended in Gelatin. Depending on the particular mixture used to create the silver halide for a paper emulsion, according to R. E. Jacobsen (et al), author of "The Manual of Photography, the "speed, rates of development and fixation, image colour and tone reproduction qualities" are affected.
- Light Sensitivity
- The presence of trace elements, like sulfur for instance, within the gelatin used in the emulsion can affect the light sensitivity, and often increases it. Silver halide crystals present within the emulsion have light-sensitive properties; when they are exposed to light, the surface changes, or develops, and is ready for processing. The crystal actually becomes what is referred to as "developable," or ready for fixing (the actual development process) in a chemical bath that stops the development of the crystals. Were they to develop fully, the image surface would turn completely black.
Portions of the chemical coating (emulsion) receiving the most light develop silver halide crystals more densely. Much like film has a speed (ISO 400, for example), photographic paper does also. The paper speed refers to the rate at which the silver halide crystals develop--how light sensitive they are.
- Monochrome and Color
- Whether a paper is intended for monochrome (black and white) images or for color, largely depends on the levels of halide present in the paper's emulsion. The more bromide is present in the paper, the greater the sensitivity of the crystals to longer wavelengths, or those that can pick up color. There are photographic papers made especially for picking up the right black and white tones from color negatives. Photographic paper made for developing prints from black and white images will not process the tones from a color negative correctly, or directly translate the tonality into a grayscale image. Rather, the image will appear murky and out of focus.
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How are photographic images made permanent?
Photographic images are made permanent through various processes, depending on the medium used. In traditional film photography, light-sensitive chemicals on the film capture images, which are then developed and fixed to make them stable. In digital photography, images are stored as digital files on memory cards or drives, where they can be saved indefinitely. Additionally, prints can be made using ink or photographic paper, which can also be treated to enhance longevity.
What is a photographic print made by placing objects on light sensitive paper and exposing it to light?
A photogram
What is the significance of photographic paper?
Photographic paper is crucial in the process of developing photographs, as it provides a substrate that captures and displays the image created by light exposure during photography. Its chemical composition allows it to react to light, producing a visible image that can be further developed through various processes. The choice of photographic paper can significantly affect the quality, contrast, and texture of the final print, making it an essential element for photographers seeking to convey their artistic vision. Additionally, it holds historical significance in the evolution of photography, marking the transition from early experiments to modern photographic practices.
How were photograms invented?
A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. In a darkroom, or a darkened room, objects are arranged on top a piece of photographic material, usually photographic paper. When the operator is satisfied with the arrangement, the photographic material is exposed with light, usually by switching on an enlarger or other artificial light source. The material is then processed, washed and dried. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed through transparent or semi-transparent objects appear grey.
What Light will not mess up photography paper when used in a darkroom?
In a darkroom, the light that will not mess up photography paper is typically red or amber light. These colors are safe for black-and-white photographic paper because they do not affect the light-sensitive chemicals in the paper. Photographers use special safelights that emit these wavelengths to allow them to work without exposing the paper to unwanted light. However, it's important to ensure that the intensity and duration of exposure to safelight are kept within recommended limits to avoid fogging the paper.
What is light sensitive paper and how does it work?
Light sensitive paper is a type of photographic paper that changes color when exposed to light. It contains light-sensitive chemicals that react to light by darkening in areas exposed to light, creating a visible image. This process is used in traditional darkroom photography to create prints from film negatives.
Which type of wasp possesses a photographic memory?
The type of wasp that possesses a photographic memory is the paper wasp.
What is a photographic copy of written or printed work?
A photographic copy of a written or printed work is commonly referred to as a photocopy. It is a reproduction of the original document created using a photocopier or similar copying technology. Photocopies are widely used for duplicating paper documents quickly and easily.
Where can you purchase photographic printer paper?
One can purchase photographic printer paper at store that sell computer and printers, as well as stores that sell stationary. Staples is one of these stores.
Why is a lens used?
just because it does without the lens light can not concentrates on the photographic sensitive material such as film or photographic paper
What is used to make photographic film?
Photographic film was invented in 1889 by George Eastman. Photographic film and paper is made using silver nitrate which is light sensitive.
What is a Kodak projection paper holder model b pat?
Used in photographic printing. It's now known as an enlarging easel. It holds the photographic paper in place below an enlarger so that projected enlargements can be made from smaller negatives. Nora Hague Notman Photographic Archives
Is photographic fixer soluble in water?
A photographic fixer is soluble in water.
What are two basictypes of photographic paper?
1 - color 2- black and white
Was i supposed to open my brand new pack of photographic paper?
If you weren't in a dark room, no.
What does Kirlian photography do?
Kirlian photography creates a photographic image by placing the object or body part to be photographed on film or photographic paper and exposing it to an electro-magnetic field.
How are photographic images made permanent?
Photographic images are made permanent through various processes, depending on the medium used. In traditional film photography, light-sensitive chemicals on the film capture images, which are then developed and fixed to make them stable. In digital photography, images are stored as digital files on memory cards or drives, where they can be saved indefinitely. Additionally, prints can be made using ink or photographic paper, which can also be treated to enhance longevity.
