将底片覆盖在此膜上，经紫外线照射后呈现出明显的色差，显示出的图象可保留24小时以上。
The negative film which covered the photochromic material was subjected to UV light, and image with clear contrast which lasted over 24 hours was obtained.
利用X射线底片扫描成像法得到铝合金焊缝图像，再通过图像处理方法即可得到焊接缺陷二值图象。
Processing the aluminum weld image from the scanning of the X ray negative can derive the binary image of the weld defects.
借助于盲拍，他显示出准确构图的能力（尽管冲印时也对许多底片做了裁剪），还原出十分真实公正的视觉图象。
By shooting "blind, " he sacrificed the ability to frame his compositions exactly (although he did crop many negatives in printing) but gained thoroughly candid views in return.
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