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Black White and Red Photography

Dan Eitreim

July 23, 2015

The picture that uses infrared rays as the main energy source for exposure can be done with conventional cameras through specially sensitized films to the area of the wavelengths between 700 and 1,200 nanometers (nm), approx.

In addition, the camera lens of digital photography equipment is usually equipped with a filter that excludes the near ultraviolet rays and all or part of the visible spectrum.

The ability to record photographically obtained infrared radiation sensitizing dyes incorporating the emulsion to absorb certain wavelengths and energy transfer of exposure to silver halide crystals.

Registration of infrared radiation

The portion of the infrared region closest to visible wavelengths is actinic, thus, can be recorded by infrared photography, using film and camera properly sensitized and a common goal.

Digital Infrared Photography classes

Black and white infrared photography can be defined as normal technique that uses a camera lens to focus an infrared image of an emulsion sensitive to infrared radiation, a record for black and white negative, from which can be obtained positive copy with the usual photographic materials.

The subject who produced the image, reflect or transmit varying amounts of infrared radiation incident on it, or luminescence emit a fall in the infrared when illuminated with an energy of suitable wavelength.

Lighting normally used for stock photography can provide or cause the infrared radiation when it comes to thinking skills, transfer or issue indoors. With many living subjects are preferred electronic flash units.

Outside, the sun provides adequate infrared radiation, but the intensity varies due to fog and clouds.

The emulsions are sensitive to infrared light purple, blue and red, as well as infrared. Therefore, a filter should be placed in front of the camera lens (sometimes in front of the light source) to prevent the passage of visible light. This filter passes infrared radiation reflected or transmitted by the subject, while excluding visible light and ultraviolet.

Color. The color infrared photography began with the development of a film intended for aerial detection of camouflage. Since then they have found many applications of color infrared photography, both on land and in the laboratory, like other aerial applications.

This picture is taken with color film for daylight sensitized to the infrared: Kodak Ektachrome infrared film. The three emulsion layers of this film are sensitized to green, red and infrared, instead of the blue, green and red, as in the current color film. In the camera using a yellow filter to retain the blue, as these layers are also sensitive to this color.

During processing, the green-sensitive layer is recorded a positive image of yellow, while the red-sensitive magenta shows a positive image, and the infrared-sensitive forms a cyan positive image.

In the slides may appear blue, but has been excluded from the image using the yellow filter. When the yellow image-sensitive layer is bright green, dominated by magenta and cyan, which combine to give the blue. Many other colors can be formed according to the proportions of green, red and infrared reflected or transmitted by the subject. For example, healthy plant leaves are recorded in red, as they are “bright” in infrared, it produces a clear image of the individual cyan, red dominates the other layers.

In the color Digital Infrared Photography, the visible light component is added to record infrared. Therefore, this film does not produce characteristic colors in the photographs of many animal and botanical substances. However, the infrared component causes the colors changed. As an example, a red rose with green leaves is recorded healthy yellow with red leaves. This color change is the basis of color infrared photography and is a valuable study of the phenomenon in the infrared.

Since the first Digital Infrared Photography was done with black and white movies, had not appreciated the infrared reflection characteristics of the substances. In the region of visible light, these changes appear as characteristics of colors. Actinic infrared band is as wide as between green and red, so there are potentially many “colors” infrared. But the differences can only be seen on color photography when using complicated photographic processes, infrared radiation is converted into visible colors. Color infrared film allows a partial conversion of this nature, it becomes an infrared image into a color image and combines it with the components of visible light.

This article touched the basics of the topic. I have 2 more resources related to the above. They are waterproof digital cameras [www.digitalphotographybasics.com/waterproof-digital-cameras-for-the-adventurers/] and photography ideas [www.digitalphotographybasics.com/photography-ideas-for-beginners/]. Do consider reading them.

Article Source: EzineArticles.com

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