We discuss digitization, subsequent digital analysis and processing of negatives (and diapositives) made by Finlay, Thames, Dufay, Paget, and similar additive color screen processes. These early color processes (introduced in the 1890s and popular until the 1950s) used a special color screen filter and a monochromatic negative. Due to poor stability of dyes used to produce color screens many of the photographs appear faded; others exist only in the form of (monochromatic) negatives. We discuss the possibility of digitally reconstructing the original color from scans of original negatives or by virtue of infrared imaging of original transparencies (which eliminates the physically coupled color filters) and digitally recreating the original color filter pattern using a new open-source software tool. Photographs taken using additive color screen processes are some of the very earliest color images of our shared cultural heritage. They depict people, places, and events for which there are no other surviving color images. We hope that our new software tool can bring these images back to life.
翻译:我们讨论Finlay、Thames、Dufay、Pacet和类似添加色屏幕过程制作的底片(和直阳性)的数字化、随后的数字分析和处理。这些早期彩色过程(在1890年代开始,在1950年代前很受欢迎)使用了特殊的彩色过滤器和单色否定。由于用于制作彩色屏幕的染料的稳定性差,许多照片似乎已经淡化;其他照片只是以(单色)底片的形式存在。我们讨论了从原始底片扫描或通过原始彩色图像红外成像(消除了物理上结合的彩色过滤器)以数字方式重建原始彩色原始色彩的可能性,以及利用新的开源软件工具以数字形式重建原始彩色过滤模式的可能性。使用添加彩色屏幕过程拍摄的照片是我们共同文化遗产中最早期的彩色图像的一部分。它们描绘了人、地方和事件,没有其他的彩色图像。我们希望我们的新软件工具能够将这些图像带回生命。