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Color Screen is a collection of tools for working with scans of additive screen processes of early color photography.
Flowers, Paget lantern slide 8x8cm, ca 1921 (left) and digital color reconstruction (right)
Additive color screen processes used panchromatic negative which was exposed through a color screen filter pretty much same was as today CCD and CMOS chips use Bayer filter. The negative was then copied to (black and white) transparency which yield to color picture when viewed through the viewing screen filter.
Our tool can
- bring back to life collection of negatives of such processes by turning them to color photographs.
- recover original colors of transparencies made by this processes which faded or got misregistered. These trasnparencies sandwich black and white slide with a color screen. If digitized in infrared spectra one can obtain a scan of the slide (screens are transparent) and then re-add the screen digitally.
- additive color screen processes are hard to view on screen or reproduce. It is a common practice to photographs these somewhat out of focus or blur/denoise them later to obtain useable pictures. We implement special demosaicing algorithms which understand the specific color screen used and produce smoother digital file without losing fine details of the image.
- TODO: What needs to be done before release
- Supported Processes: List of supported processes
- Collections: Known collections of additive color screen processes around the world
- ColorScreenGUI: Java based GUI
- colorscreen: Library, command line utility and legacy GTK2 based GUI