Industry news

Color temperature also belong to the category of light color, this article will be listed separately, because the "color temperature" in the TV light is indeed a very important concept.

4. Color temperature requirements

The color temperature is the scale of the light color of the light source, in units of K (Kelvin). Color temperature is defined in accordance with the absolute black,the color of the light source and the blackbody  at a certain temperature give off the same color ,at this time the absolute temperature of the blackbody is called the color temperature of the light source. With the increase of color temperature,the color will gradually transit  from the blackbody  to the "red - orange - yellow - blue" . The same object under the irradiation in different color temperature light source can present different colors. For example, a piece of white paper, in the 3 000 K incandescent and 6 000 K fluorescent lamp irradiation, according to the truth of the color is not the same, the former is warm yellow, the latter is micro blue. But in fact, the human eye is not sensitive to this difference,  people without color knowledge often think that is white, which is the human eye "color vision conservation" phenomenon. The human eye of this adaptability, making people normal observation scene color, but can not accurately feel the color characteristics.

It is because of this inertia of the human eye, in the stage lighting involved in the "color temperature" concept, not too much emphasis on the color of the light is mainly related to the human eye based on the vision. But in the TV light, the color temperature is a very important concept, which is mainly due to the camera are very sensitive to color changes in the external environment , very "objective". Once the camera's white balance is established, the slight changes in the color temperature will be reflected in the TV screen, shooting bad TV picture in the face color is not restored, sometimes yellow or sometimes bluish, it is the reason that TV light color temperature changes and the camera white balance not coordinated. Before the filming, there is a fixed workflow between TV lights and the camera's coordination. First of all, the lighting workers to open a basic lighting source (referred to as the basic light source, is the main light source of stage lighting, generally refers to the performance of the face light, ear light, backlight, etc.), this basic light source requires its color temperature is same with one of basis light source to be commonly used in performance,meanwhile,turn off the other light with different color temperature not to be used in performances. Then, all the cameras of the different units  according to this basic light "whitening"to  unified debugging. "White" is a saying often used by television workers, and the" white" actually refers to the adjustment of a white balance, that is, all the cameras first unifiedly definit a white according to this base light source,all the cameras have a common "white" be standard. Different colors temperature of light or colored light will be based on this "white"  "show their different visual hue.

There is a very typical example of a television broadcast.It must be considered matching problems of the studio's basic light source or the color temperature of main light source in the purchase of follow-up light . If the TV studio's basic light source is 3 200 K low color temperature, chasing light is 6 000 K high color temperature, and the camera adjusts the white balance is based on 3 200 K basis light source, then the chisel lamp projection To the person's face, the color displayed on the TV screen will be significantly cold blue. On the contrary, the high color temperature of the basic light source must be equipped with high color temperature chasing light. If the studio's base light source has a color temperature of 6 000 K and the chase is equipped with a 3 200 K light source, the camera will be projected onto the human face with the 6,000 K base light, After shooting the show is warm yellow, TV screen color cast must be very obvious, uncoordinated.

Television has a very typical example.Must consider when buying follow spot and studio light source or main light source color temperature matching problem.If the light source is the basis of a television studio 3 low 200 K color temperature, follow spot is 6 000 K of high color temperature, and the camera to adjust the white balance is based on the basis of 3 200 K light source, so the follow spot projected onto the face, the color show on the TV screen slants cold blue.On the other hand, the high color temperature of light source must be equipped with high color temperature follow spot.If the fundamentals of the studio light source color temperature for 6 000 K, and the follow spot is equipped with 3 200 K light source, the camera based on 6 000 K light source after the white, the follow spot projected onto the face, after the camera is displayed as warm yellow, television images of partial color must be very obvious, uncoordinated.

Therefore, the TV station in the purchase of chasing light is best to first consider their studio base light source color temperature, so that the light and the studio based on the same color temperature, in order to better restore the skin color. Of course, now chasing light can be equipped with warm color paper and light color paper, but after all, there may be inaccurate, color cast the case, if one step is not better?

The staff from the drama stage lighting design into the TV lighting design often don't understand the professional level on the camera principle and some specific parameters , so they often lack of rational judgment on the design procedures . As a TV lighting designer,learning the knowledge of the tutorial camera is very necessary,which is the drama academy course lacks of stage light .

From: VanGaa Lighting

Keywords:characteristics of TV lighting and stage lighting,color temperature requirements,vangaalighting

(please indicleate the source from if you want to reprint or re-issue this article)