在刑事案件现场勘查中，我们常常碰到一些红色客体或多色图案的客体，并在这些客体上发现了作案分子遗留的手印。通常情况下，基层技术人员一般都用黑白照相方法拍照提取这些客体上的手印。然而，冲晒出的指印往往都出现纹线反差较弱，并且纹线受客体图案颜色的干扰，造成纹线? In the field investigation of criminal cases, we often encounter some objects of red objects or multicolored patterns, and handprints left behind by the criminal elements are found on these objects. Normally, grass-roots technicians generally use black and white photography method to take pictures of fingerprints on these objects. However, fingerprints often appear out of the line contrast is weak, and the lines by the color of the object pattern interference, resulting in lines?