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物证照相通常需要无阴影或无投影照相,脱影照相就是把被拍对象由于光照而产生的投影消除,使物体的影像轮廓边缘特征清晰的显示出来,以利于辨认和检验的一种重要的照相方法。主要方法有利用自然光下的散射柔和光脱影、利用脱影灯箱脱影、利用平面玻璃悬空法脱影、利用黑衬底脱影、利用环形闪光灯脱影等拍摄技法。
Photographic evidence usually requires no shadow or no projection photography, photography is to take off the film object is due to the projection of light to eliminate the projection, so that the outline of the image edge features clearly displayed in order to facilitate identification and inspection of an important photo method. The main method is the use of natural light under the soft shadow of light-off film, the use of off-shade film off the shadow of the use of flat glass hanging off the shadow of the use of black film, the use of flash off flash shadow shooting techniques.