在拍照、放大、显影等过程中,因某种原因造成了底片、照片的密度过大,直观来看,底片厚了,照片色调深了。但是,可以运用减薄液减薄的办法去掉一部分密度,使底片或照片密度的厚薄、深浅达到适度。然而,对于照片来说,除了减深之外,还有其特殊作用。例如,(1)用过期相纸使放出 In the process of photographing, magnifying, developing and so on, due to some reasons, the negatives are caused. The density of the photos is too large. Intuitively, the negatives are thick and the color of the photos is deep. However, you can use the thinning liquid thinning method to remove part of the density, film or photo density of the thickness, depth to moderate. However, for photos, there is a special role to play besides the deepening. For example, (1) release with expired photo paper