摄影是纪录、传递信息的重要手段,也是一门广泛的群众性艺术活动.一张照相片的产生,要经过拍摄、冲洗底片、印制或放大(或扩印)等环节.在整个过程中,前道环节的缺陷往往可以通过后道环节予以补救.例如:由于拍摄时曝光量不适当、照明光源色温偏差或滤色镜使用不当等原因,致使底片密度不标准或破坏了三色平衡.若能恰当地掌握印相时的曝光量及印相 Photography is an important means of documenting and transmitting information, and is also an extensive mass art activity. A photograph is produced through filming, filming, printing or enlargement (or enlargement) etc. Throughout the process, Defects in the front link can often be remedied through the back link, for example, due to improper exposure during shooting, color temperature deviation of the illuminant light source or improper use of the color filter, the density of the negative film is not standard or the three color balance is damaged. Grasp the print exposure and printing