What photography skills can open the door to a new world?

Infrared photography uses infrared rays to penetrate the color infrared photographic gas larger than the living body, and has a reflection coefficient different from that of visible light. It can be used to shoot objects and creatures from a distance, distinguish forests from plants, and various identification photography. When taking pictures, infrared filters that can block visible light are combined with infrared films. For an ordinary camera, the focus is slightly biased and needs to be compensated slightly. The photography we usually contact is visible light photography, which is a technology that uses visible light to form images. As can be seen from the figure, the wavelength of electromagnetic wave is only one billionth micron from several kilometers to gamma ray, and visible light is only a small part of it. Since visible light is a kind of electromagnetic wave and can be imaged, can other electromagnetic waves be imaged? Ghostly infrared photography. The answer is yes. Almost all wavelengths of electromagnetic waves can be imaged, but the means of obtaining this image are different. X-ray imaging is often used in medical treatment, γ -ray imaging is used in flaw detection of industrial products, and radio telescopes in astronomical research use radio waves for imaging. Infrared digital photography is the product of the development of science and technology, which gives us another way and possibility to see the world. Infrared photography can be divided into black and white and color. Black and white infrared started with Sony 707. By using the night vision function of the camera and the infrared filter, we have an unprecedented visual experience. The "dark night" during the day, the "snow scene" in summer, the continuous white grass and the crystal clear rime are quiet and ethereal, and unpredictable. Color infrared is like a palette. We can smear it at will, break all the rules, change the order before everything and subvert the established visual memory. Just a word, we are afraid that we can't do it, but we are afraid that we can't think of it. Black and white infrared is subtraction, and color infrared is addition. Black and white infrared is the past tense, and color infrared is the future tense. Advantages: After testing, the infrared ray in natural light radiation can reach more than 40%. In black-and-white photography, special filters can be used to block visible light from red to dark red, so that infrared images can be sensitized on film. For example, the "Leiden 87C" filter can block almost all visible light and produce pure infrared photography effect. This filter is almost opaque to the naked eye, so you should adjust the focal length before adding the filter, and you need to shoot to get normal exposure. Generally speaking, "Leiden 25" red mirror can be used for infrared photography and can also produce obvious infrared effect. So what is the reason for infrared photography? The brightest objects seen by human eyes, such as blue water and sky, can't reflect more infrared light, so that although imaging in ordinary black and white film is normal, the color of infrared film is dark. The reason why trees and grasslands turn pale is that chlorophyll can reflect a lot of infrared rays, thus achieving an unrealistic artistic conception. Infrared ray not only provides a special creative technique for photography, but also can take clear photos in fog and smoke due to its high transmittance. It is often used in exploration and military reconnaissance in scientific research.

Using the characteristics of infrared rays penetrating the surface of the picture and pigment, we can also judge the authenticity of the famous paintings of masters. Usage: Before the birth of digital photography, special infrared film was needed to take infrared photos. The photosensitivity of film can be controlled by adjusting its chemical composition. Friends who engaged in black-and-white photography in the early days know that black-and-white film can be divided into dichroic film and panchromatic film. Dichroic film is only sensitive to light of a certain color, panchromatic film is sensitive to all visible light, and infrared film is particularly sensitive to infrared light in a specific wavelength range. Shooting and developing with infrared film is technically difficult and costly, and ordinary photographers rarely have the conditions to try it. It is mostly used in scientific research, criminal investigation, military and other fields. Because different substances have different absorption properties of visible light and infrared light, some differences that cannot be seen under visible light can be found through infrared photography. Infrared photography is often used in the inspection of criminal investigation technology to achieve the following purposes: to display ink, graphite pencils, carbon ink copy paper and ink handwriting covered or contaminated by aniline dyes, organic dyes and red stains; Identify the structure, stains and spots of textiles; Display vague postmark marks; Show faded or discolored handwriting or patterns; Shooting outdoor scenes shrouded in mist; Displays the handwriting of a document that has been dug or scraped. Infrared photography, such as this ground hat, is what we see with the naked eye when shooting with ordinary digital cameras. However, the effect of infrared photos is very different, and the originally inconspicuous lines and pores are particularly prominent. This is because the absorption and reflection properties of sewing thread of pure cotton cloth and chemical fiber are very different. The cotton fabric will absorb infrared rays, while the sewing thread of chemical fiber will almost completely reflect infrared rays (the close-fitting clothes of pure cotton are very comfortable to wear because it absorbs the infrared rays of the body and then radiates them out, instead of reflecting them back to the human body like the chemical fiber fabric). In addition to the above technical applications, infrared photography has a very unique expressive force in the field of artistic photography, especially in the field of landscape photography, and the imaging effect is quite special, which also makes many photographers obsessed with it, so that they have fans. Asserting that "once you take the first infrared photo, you will be fascinated by this fantastic effect." You will be fascinated by it and cannot extricate yourself. "Wonderful infrared photography.