From Negatives to Positives: Modeling the Photochemical Printing Process

Most analog color photographs were captured on film negatives. This study presents a scientifically validated workflow for digitizing and inverting color negatives to produce digital positives that closely emulate traditional enlarger prints. A custom imaging system with narrow spectral bands, designed to match the spectral sensitivities of photographic paper, was tested against a conventional digitization method. Final color images were computed based on the spectral densities of the paper’s image-forming dyes, simulating the photochemical printing process. Results demonstrate that aligning digitization spectral bands with photographic paper characteristics improves inversion accuracy. This research lays the foundation for enhanced archival preservation of color negatives and provides a method for generating digital positives that closely match the aesthetic of original prints.