Contrast processing techniques

"Light and contrast" describes a screen, light and dark relate to each other. Dark contrast level is determined by the nature of the lighting. Direct light is scattered light in the darkness of the subject contrast to strongly positive side light ratio; the light in the darkness of the subject contrast to the more strongly; light resulted in the shadow of the more obvious, the more strongly contrasting light and dark. Dark contrast to "shade" describes a screen, light and dark relate to each other. Dark contrast level is determined by the nature of the lighting. Direct light is scattered light in the darkness of the subject contrast to strongly positive side light ratio; the light in the darkness of the subject contrast to the more strongly; light resulted in the shadow of the more obvious, the more strongly contrasting light and dark. Dark contrast level can use numbers to quantify in Imaging, usually use the "light of the word than" to describe the size of the difference between light and darkness. The so-called optical ratio refers to the composition of the highlights and shadows in the light of illumination. The larger the light than from Ming to the dark layer changes more apparent, the more strongly the effect. Conversely, the less light than, the level of variation between light and darkness, the more blurred effects tend to dull. A different light than on the content of different shots and shade, it reflects the style is different. High-contrast screen, highlight and shadow, brightness differences from Ming to the dark layer changes significantly, the impression is hard; on the contrary, low contrast scenes hierarchy variety not obvious, the screen effect is soft. But too high contrast of light and shade are often unable to put the light and dark detail is good, but too low contrast of light and image will be too flat, the lack of angry. Performance than with highlight to men strong, with a small light than to show female tenderness, for film and television in the usual way. Shooting with light as the main male character, in the light of the body causing significant shadows to exaggerated male muscle texture, a sense of empowerment. But to embody feminine gentle side, with astigmatism lighting, create a gradation of soft small light ratio. Highlights of the Department with the shadows on the screen in the representation of different sizes, its meaning will be different. When you want to show the effect of the night or performance is fear, gloomy, mysterious, sad mood, often to let the screen of the shaded area is greater than the light, and the contrast of light and shade screen design is comparatively high, and let the screen light more than shadows and light and contrast design is relatively low, often show the day's results or happy, positive emotion means when used. Appropriate use of light and contrast DV-camera, we can not handle the light ratio is too high, if light ratio control, light is just a piece of white and dark is black. Details will not be rendered, and also do not see the color changes. This is because the camera CCD on gaoming dark contrast of tolerance than films are much lower, the adaptation of human eyes, more is unmatched by CCD camera. In static photography, highlight and shadow light and contrast between the strong, in the picture looks pretty good, the DV-RI becomes only a dark picture of the two regions. For feature film photography, better light ratio is 2: 1 to 3: 1. This light than the human eye is quite bland, but for the DV machine is working properly. For the performance of the night effect or fear, gloomy, mysterious, sad mood, you can use more than 4: 1 ratio of light to capture this, of course, the inevitable will lose some of the details.