Digital analysis of early color photographs taken using regular color screen processes

TL;DR

This paper presents a novel digital method for accurately digitizing early color photographs created with color screen processes, addressing challenges like dynamic range, resolution, and pattern stitching.

Contribution

It introduces a new open-source software tool that analyzes and precisely stitches images of early color photographs with regular screen patterns.

Findings

Successful digitization of early color photographs at the National Geographic Society.

Effective handling of geometric pattern repetition and resolution issues.

Enhanced digital presentation of historical photographic collections.

Abstract

Some early color photographic processes based on special color screen filters pose specific challenges in their digitization and digital presentation. Those challenges include dynamic range, resolution, and the difficulty of stitching geometrically-repeating patterns. We describe a novel method used to digitize the collection of early color photographs at the National Geographic Society which makes use of a custom open-source software tool to analyze and precisely stitch regular color screen processes.