التعارض بين مدلول الألوان الساخنة أو الباردة ، في لغة أصحاب الحرف المختلفة

The contradiction between the meaning of “hot or cold colors” in the language of the different craftsmen:

Points of view differ in interpreting the meaning of what we call hot or warm colors on the one hand, and cold colors on the other hand. When the artist or painter talks about the “blue color,” he calls it “a cold color,” and when he talks about yellow or red, he calls it a hot or warm color. From his point of view, they are two colors that resemble the colors of fire, glowing coal, or the hot sun. As for white and blue, they are two colors that resemble The colors of the ice, the moon, the stars and the cold sky.

Men of natural sciences and photographers have an interpretation contrary to the above, and this interpretation was built on the theory of color temperature previously explained. When a naturalist or photographer talks about the red color, he means a cold color when compared to the white color tinged with blue, which from his point of view represents the highest color temperature. . And when he mentions the blue of the sky, he means a color with a very high temperature that may reach 27,000 Kelvin. (Please refer to Table 3 p. 54). Does the color temperature tell us a true indication of the composition and components ratio?

Light rays emitted by a light source? In response, we say that the light rays emitted by two different sources may agree, for example, in their color temperature, and they appear to the eye as rays of similar color, but what may differ (1) much in the relative spectral energy distribution, so the relative distribution of energy instead of

A correct indication of the visible and invisible radiation emitted by the light source. The tungsten (photoflood) lamp with blue glass that we use in photography as a substitute for daylight due to its bright light. other spectrum of visible rays. The white flame carbon arc lamp also emits a large spectral energy of short-wave ultraviolet radiation, and visible spectral energy as well.

Despite the difference between the two previous sources in the relative distribution of the visible and invisible spectral energy, they may agree in their color temperature (... two kilowatts in both cases, as is evident in Table No. 3 p. 54), because the color temperature is specific only to the case of comparison between Two elegy colors that the eye senses, without giving any consideration to the invisible radiations (1).

Since sensitive films are affected by both visible and invisible rays, it is not enough only to know the color temperature of the rays of the light source, but we must also know the distribution of the spectral energy emitted by the source, so the color temperature is only an approximate way to perceive the colors of the visible rays emitted by the source.

If we used sensitive color film for imaging in two batches and by two sources that are similar in the color temperature of their rays, but differ in the distribution of the spectral energy that they emit, we would find a difference between the colors of the final images that we get, as the effect of the rays of each light source on the film differs greatly from the effect of the other (2).