At first, as already described in other articles, photographing is drawing with light and understanding the basics about light, such as the best time, its color temperature, etc. it is essential to make an impact photo ”.
Therefore, understanding how light works in digital equipment will help you understand how colors draw and change as you shoot.
The feeling of color
The sensation of color is produced by rays of light reflected or transmitted by an object. A ray of light can be considered an electromagnetic wave, part of the broader series of electromagnetic waves that travel through space and it is described by its wavelength and its frequency.
Wave-length
The wavelength is the distance between two corresponding adjacent points in the wave pattern, as shown in while the frequency refers to the number of waves passing through a given point each second. The product of the wavelength by frequency is equal to the speed of the wave. The electromagnetic spectrum extends from wavelengths from 0.0000001 nanometer (nm) to 1000 km. What we call light is the visible part of the spectrum, from approximately 400 nm to about 700 nm.
Taking into account that 1 nm is equal to 1/1000000000 m, it is clear that the visual spectrum represents a very small part of the electromagnetic spectrum. Below 390 nm is the ultraviolet (UV) range and above 760 nm is the infrared (IR) range. UV and IR radiation are therefore not visible.
In digital cameras, charge-coupled device (CCD) electronic sensors and the complementary metal oxide semiconductor (CMOS) semiconductor are sensitive to infrared rays […]
White light is a mixture of colored rays. In the second half of the 17th century, Sir Isaac Newton showed that when white light falls on a transparent glass prism, it is not only deflected, but also refracted in many colored rays in the following order: red, orange, yellow, green, blue , indigo and violet. The magnitude of the refraction depends on the wavelength of the ray, which showed that white light consisted of rays of different wavelengths, which correspond to the colors that we see in the spectrum (LANGFORD, 2013).
The following images illustrate the wavelength and incidence on the prism denoted by:
Only after studying about light did I discover the meaning of Pink Floyd's Dark Side album cover
Light Reflection
Therefore, if objects are perceived by the human eye from the reflection of light, it is from the entry of that same light through the lens of the camera that we will be able to register and perceive the information contained in the images.
Although you can delve into the advanced physical concepts of understanding the incidence of light on objects, the scope of this article is to propose an understanding of the effects of illumination through your camera and the responses it offers when recording images.
In practice
Compare the camera's light perception to the human eye itself. A clear and sunny day seems to reveal much more colors and details than a rainy evening. Likewise, looking directly at the sun will cause you to have blurred vision for a few moments, due to the excess light received by the cornea, which must distribute this light wave to the retina. Just as our eyes have, in the pupil, the movement of opening and closing by measuring the light input, so it is with the diaphragm of the camera.
Different lights
In this way, a photograph taken in the morning light will provide different results from the same image taken at sunset. Likewise, pointing the camera directly at the light will make it “blind” instead of recording the image. However, a photo taken at night, without the aid of supplementary light, will reveal less detail than the same image produced during the day.
Curiosity:
Even before photography became popular, Impressionism in the 19th century clarified the role of light in the perception of reality, including colors. Claude Monet was known for a series of paintings of the Cathedral of Rouen, portrayed at different times and situations of the day. In this way, he made clear the importance of the incidence of light and these changes in perception.
Until the next article!
Anyway, we will meet in the next article on photographic technique.
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