论文部分内容阅读
密度控制是保证缩微品质量、衡量缩微品好坏的关键指标之一。 一、摄影中密度的控制 缩微摄影室对灯光要严格管理,防止光源相互干扰。摄影人员每拍一种资料时,都要做试验,达到把胶片密度控制在1.0左右。 二、原件与密度的关系 我们针对不同颜色的纸张和字迹对缩微胶片的感色性进行了一系列的试验,又做了对不同纸张和不同字迹的档案逐级曝光试验,制定出不同原件选用曝光档次的参考数据。根据这些数据拍摄,一般都可获得质量较为理想的缩微品。一般说,在原件纸张字迹较好的情况下,缩微品的密度好坏与分辨率的高低是一致的,但在原件纸质、字迹很差的情况下,用以作为调整曝光量的依据应该是缩微品的清晰度和分辨率。
Density control is to ensure the quality of the microfilm, one of the key indicators to measure the quality of the microfilm. First, the density control photography Photographic studio on the light to be strictly managed to prevent the light interfere with each other. Photographers every time a film of information, we must do the test, to achieve film density control at 1.0 or so. Second, the relationship between the original and the density We for different colors of paper and writing on the color of the microfilm of a series of tests, but also done on different paper and different handwriting file level exposure test to develop a different original selection Exposure level reference data. According to these data shots, generally can get better quality microfilm. In general, in the original case of good handwriting, microfilm density is consistent with the level of resolution, but in the case of the original paper, poor handwriting, as a basis for adjusting the amount of exposure should be Is the definition and resolution of the microfilm.