The Nature of light is different, and the perceptible color of an object depends on the light source. The human brain can “correct” these color changes very well, but the film or CCD/CMOS photoreceptor we use cannot accomplish this task.
If an object burns, first the flame is red, as the temperature rises then it becomes orange-yellow, then it becomes white, and finally, blue appears.
Scottish mathematician and physicist Lord Kelvin first discovered the close relationship between heat and color in 1848, and left the world a great concept of “absolute zero” (-273.15 degrees Celsius). Since then, the Kelvin temperature scale was created. This is the theoretical basis for our discussion of color temperature today.
The Kelvin temperature scale uses K (abbreviation for kelvin) to express temperature. Take the flame as an example here, the lower value means the more “red”, the higher value means the “blue”. Red and blue are not the colors of light itself, but just show that there are more red or blue components in the spectrum.
Let’s take a look at the common standards in the Kelvin temperature scale: “Absolute zero” is expressed as 0 K in the Kelvin temperature scale, which corresponds to -273.15 degrees Celsius (or -459 degrees Fahrenheit). At this temperature, the thermal activity of the substance stops completely.
The more bluish the light color get, the higher the color temperature is ; the more reddish the light color has, the lower the color temperature get. The color temperature of the light source is different, and the light color is also different. The color temperature below 3300K has a stable atmosphere and a warm feeling; the color temperature is between 3000-5000K as the intermediate color temperature, which has a refreshing feeling; the color temperature above 5000K has a cold feeling. Different light colors of different light sources make up the best environment.
The preference for color temperature varies from person to person, which is related to the scenery we see daily. For example, in areas close to the equator, the average color temperature that people see daily is 11000K (8000K (dusk) ~ 17000K (noon)), so they prefer high color temperature (it looks more real). On the contrary, people in higher latitudes (the average color temperature is about 6000K) prefer low color temperature (5600K or 6500K), which means that if you use a high color temperature TV to show the Arctic scenery, it looks like It is bluish; on the contrary, if you use a low color temperature TV to watch the subtropical style, you will feel a little reddish.
How is the color temperature of a TV or display defined? Since the average color temperature of China’s scenery is between 8000K and 9500K throughout the year, TV programs are produced with the audience’s color temperature of 9300K for photography. However, the usual color temperature in Europe and the United States is different from ours. The production reference is based on the average color temperature of about 6000K, throughout the year. Therefore, when we watch foreign films, we will find that 5600K～6500K are the most suitable for viewing.
People with black eyes see 9300K, as white, but people with blue eyes see a blue tint. At 6500K, people with blue eyes see white, while people with black eyes see yellowish colors.