In the last article, we talked about cone cells and sticks and how they are responsible for sending information in eye color processing.
It is important to understand that depending on the variation of the waves, the perception of colors can change, in this sense the direct source, indirect font and colored font enter.
Direct light source
This comes from this type of light that directly affects the eye through a source.
Indirect light source
This type of light, on the other hand, is perceived according to the reflection that passes through objects or is reflected by a surface given by objects and reaches the eye.
Colorful light source
This light source is linked to both the applicability of light and color, that is, it occurs through a light source and according to the color of the object, so how does this process occur in the perception of the human eye?
The transparent color is visible because between the colors of the object, the light passes through them. As for the color of the surface, the light is reflected by the surface of the objects.
In most cases, photographers, photography enthusiasts and some new photography studios do not yet have a complete understanding of the variation in this brightness, but for the photo to be beautiful and with a balanced tone and brightness, it is also necessary to understand these effects. .
Colored light sources are reproduced from stimulation in relation to all wavelengths contained in light sources.
The light we see is usually made up of other lights of different length and the color of the light will change depending on the degree of mixing.
By adjusting the intensity and degree of mixing of the primary colors: red, green, and blue, it is possible to generate several colors of lights that can be recognized, then, when these 3 colors are balanced, the white hue appears.
This is a method called “additive color mixing”. The method is precisely to adjust the colors by adding lights. This principle is used in various light-emitting devices, such as monitors, projectors and TST.
The three primary colors of the lights essentially correspond to the colors of a light source.
Therefore, each color can be generated by mixing these 3 primary colors, which gives different colors.
If these 3 primary colors are mixed into a sheet of white paper, the result will be black. Therefore, they did not think, but absorbed. This method of generating new colors is called “sustrous color mixing”.
In this case, the colors are adjusted by subtracting the lights that correspond to cyan (C), magenta (M), and yellow (Y).
Colorful light source
The color light source is a light that reaches directly into the eye from the arranged light sources.
The color temperature represents the color tone of the light source, showing the temperature of a perfectly black imaginary body, and is indicated in Kelvin (K).
A perfectly black body has the peculiarity of absorbing all the emitted light, in all the existing wavelengths, without reflecting the light or letting it pass.
The color of the perfectly black body surface has an absolute zero temperature and changes when heated. The color temperature of each light source indicates approximately the color of the body surface.
The color temperature expresses exactly the appearance of the color of light emitted by a light source. This definition is based on the relationship between the temperature of a hypothetical object or material, known as a body, the radiant black body or perfectly black body, and the distribution of the energy emitted, as the temperature of that black or perfectly black body rises from absolute zero.
Differences in color tones
An example of this occurs when fired under an incandescent lamp, the red elements of the photo results appear stronger than in photos taken under fluorescent lights with a fluorescent color of daylight.
If you look at the heating of a piece of iron placed on fire, you will see that the same room behaves differently depending on the temperature, this is based on planck’s law, which at higher temperature, greater color differentiation of the object. , the same with photos.
At room temperature, there is a dark color, and this color can be more reddish, yellowish or even bluish white, that is, this color will become lighter and clearer as the temperature increases, until it reaches the melting point.
This observation shows that there is a spectral peak that drifts along the shorter wavelengths, resulting in a more bluish white.
We call the warmer colors, the ones that are warmer, connecting it to the heat of the sun, coming from the tropical area, and the colors are called cold colors related to the bluer tones, connecting it with the cold ice of the Arctic. poles of the earth. The higher the Kelvin temperature, the more bluish the color and the colder it is, the yellower it will be.
In conclusion, depending on the positioning in which you place your Canon camera, and depending on the lights you use, whether fluorescent or incandescent, there will be a certain balance of colors, given the temperatures produced by this brightness.