火棉胶及卤化物对湿版摄影成像的影响

The Effects of Collodion and Halideon on Wet Plate Photography Imaging

在板材、银浴、曝光、显影、定影等条件不变的情况下,研究火棉胶配比、卤化物组分、火棉胶溶剂的改变对成像效果的影响。通过观察湿板图像,用Ps软件分析图片亮度和对比度的数值,结果表明:Br^(-)、I^(-)摩尔比1∶1时成像最优,额外添加F^(-)、Cl^(-)可提高感光度,加Cl^(-)的较加F^(-)的感光度更高。可用无水乙醇代替粮食酿造酒精配制火棉胶溶液。

Under the same conditions of board,silver bath,exposure,development and fixing,the effects of the changes in collodion ratio,halide composition and collodion solvent on imaging effects were studied.The observation of the wet plate images and the analysis on the brightness and contrast ratio of the images using Ps software show that the imaging effect is the best when the content of Br^(-)and I^(-)is 1∶1.The addition of F^(-)and Cl^(-)can improve the International Standards Organization(ISO)values.Meanwhile the ISO value of adding Cl^(-)is higher than that of F^(-).Absolute ethanol can be used to replace grain alcohol in preparing collodion solution.