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See a very good article, we can share it together. Today we talk about the illumination requirements and the light ratio requires these two different differences.

Stage lighting is mainly reflected in the human eye; TV lights are more important is reflected through the TV screen, the TV lights, the camera is an important device. The stage of the theater is based on the human eye, and the video is based on the camera as the frame, which is a different perspective. Stage performance is the human eye in the stage of experience, personal perspective is unique; and television program recording, it is the camera in the observation stage, the camera is a number of seats, multiple perspective. TV screen is taken by the camera, there are cameras and cameramen on the light of the reflection, and then through the director of a number of viewing angle screen to choose to edit, through the transmission of television signals presented in front of the audience. This is a big difference between the stage performance and the TV screen.

1. illumination requirements

The visual range of the human eye is relatively large, that is, the brightness range can be felt relatively large, whether it is sunny or moonlight dim, the human eye can be through the pupil of the free adjustment to see the object, to distinguish the details. On the human eye to watch the stage lights, the stage and the scene of the bright and dark brightness as long as the audience visual comfortable.

The camera is through the lens inside the aperture and the CCD sensor sensitivity adjustment to adapt to the changes of light and shade. When the studio illumination is low, the camera can open a large aperture, high illumination can open a small aperture. But the size of the aperture will affect the effect and quality of the image, such as the virtual reality of the depth of field effects, image clarity and so on. When the camera aperture to the maximum, the halo will be more obvious; if the camera aperture is too small, because the diffraction phenomenon will reduce the image clarity. Therefore, as a TV lighting designer, be sure to keep the program recording the scene is relatively appropriate intensity of illumination, so that the camera can determine a suitable aperture opening to ensure the quality of the footage. Neither the illumination is too small, forcing the camera to the maximum aperture; also the illuminate isn’t too large, forcing the camera to the minimum aperture, it will affect the effect of the TV screen. At the same time need to pay attention to different camera sensitivity is not the same, the requirements of the contrast is also different.

Studio lighting illumination is to ensure that the camera can be adjusted to the appropriate aperture, get a clear picture.

2. light ratio requirements

 Light ratio refers to the light in the scene on the ratio of the intensity values between light and dark.The scene by using different light than modelling, can show different artistic effects, light ratio large, strong contrast, visual impact;light ratio Small, contrast soft, can make people feel comfortable.

Stage light on the use of light ratio is rich, arbitrary, as long as meet the audience visual, freedom is very large. Many intense drama is accomplished by big dark contrast to achieve .TV lights are not the case, the camera allows the maximum contrast is limited. In the TV light arrangenment, the size of the illumination can be adjusted by  the camera's aperturein a certain range  to make up, but the light ratio of the lighted can not be adjusted by the camera, it should be said that the light ratio is relatively objective, there is no way for the camera to adjust the light ratio of object from 2: 1 to 3: 1. If the light ratio of the object is too large, beyond the allowable range of the camera, at this time, if the camera to illuminate the object as the standard adjustment of the aperture, to show the details of the bright part, then the dark part may be black paste into a ball; If the camera to the dark as the standard adjustment of the aperture, then the dark can reflect the gradation, but the bright part may be exposed to white one. This is not ideal picture effect, are the director can not be used.

When the designers arrange the light for the the scenery , often through the surface light, ear light, side light, backlight, background light and other different light ways for light, according to the different requirements, different lamp light size configuration, different light ratio requirements , but overall, the TV light ratio requirements can not be too large, if the light ratio is too large, the camera reacts the frames or bright exposure, or dark side into a black paste.If the lighting designers found television pictures with this kind of situation during the terrace, the rehearsal stage, to be timely to the light of the light by the adjustment.

TV light task is to well control the scene of the illumination and light ratio, through the camera to get a good TV screen visual effects.

Tomorrow we talk about color and color temperature requirements.

From: VanGaa Lighting

Keywords:characteristics of TV lighting and stage lighting,illumination requirements,light ratio requirements,vangaalighting

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