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介绍了用铜物理显影方法挽救微弱银影像的技术。实验表明，对黑白负片拍摄的文汇报半调影像，曝光量可以减少至常规曝光量的１／１２５；对Ｘ光胶片拍摄的手指骨连续调底片，曝光量可以减少至常规曝光量１／３：铜物理显影方法更适合于半调影像。
The technique of using copper physical development method to save the weak silver image is introduced. Experiments show that black and white negatives of Wen Wei Po halftone images, the exposure can be reduced to 1/125 of the conventional exposure; X-ray film shot of the finger bone continuous film transfer, the exposure can be reduced to the conventional exposure 1/3: Copper physical development method is more suitable for halftone images.