感光材料一旦受光,就会伴随曝光量的增加而密度值增高。但是,当曝光量过渡时,密度反而减小,即黑色变浅。这种由于曝光过度而使影像反转的现象叫做负感作用。感光材料在显影加工中,由安全灯等进行灰化而影像发生反转的所谓萨巴蒂效应,其反转状况有相似之处,故也叫做负感照相。这里作为特殊照相的一个实例,介绍一下由萨巴 Once the light-sensitive material is exposed, the density value increases with the increase of the exposure amount. However, as the exposure transitions, the density decreases instead, ie, the blackness becomes lighter. This phenomenon of image inversion due to overexposure is called negative effect. Photographic materials in the development process, by the security lights and other ashing the image inversion of the so-called Sabanti effect, the reversal of similarities, it is also called negative photography. Here as an example of special photography, introduce yourself to Sabah