Polachrome
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Linear filter structure in Polachrome 35mm instant slide film. The blue filter strips are slightly larger compared to the red and green filters. The filter lines are running along the film strip. According to the image placement of the 135 film format for still photography the image is divided horizontally into triplets of R, G and B filter lines.
The emulsion layer has been removed before the image was taken.
Credit: David Pfluger, ERC Advanced Grant FilmColors. Imaging was performed with support of the Center for Microscopy and Image Analysis, University of Zurich. -
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Linear filter structure in Polachrome 35mm instant slide film with a emulsion layer of low photographic density.
Credit: David Pfluger, ERC Advanced Grant FilmColors. Imaging was performed with support of the Center for Microscopy and Image Analysis, University of Zurich. -
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Comparision of the linear filter structure of Polachrome 35mm instant slide film and Polavision Super-8 motion picture film. While the technical concept behind the two film stocks is the same, the Super-8 film was produced with linear filters of a smaller width. Based on the given width of an RGB filter triplet and the 135 still image size there are about 920 horizontal RGB-triplets per image for a Polachrome slide. The Super-8 film image is rotated by 90° compared to the 135 film still image and has about 340 vertical RGB-triplets per frame. The positioning of the image content compared to the filter lines is indicated in the picture.
Credit: David Pfluger, ERC Advanced Grant FilmColors. Imaging was performed with support of the Center for Microscopy and Image Analysis, University of Zurich.
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Measurements
A comparison of the spectrum measured from a Polachrome sample with the published spectrum for Polavision shows a similar basic curve progression but all the absorption maxima differ, particularly for the green screen dye.
Credit:
Right: Figure 13 from Land, Edwin H. (1997): An Introduction to Polavision. In: Photographic Science and Engineering, 21,5, Sept., Oct., pp. 228–236, on p. 236.
Left: Giorgio Trumpy, ERC Advanced Grant FilmColors.
