Trichrome photography involves taking three exposures of the same subject on black and white film. Each exposure is taken through a red, green or blue filter.
One of the early users of the process, over a hundred years ago, was Sergey Prokudin-Gorsky , he used projectors with coloured filters to make a combined image, nowadays it can be done with photo editing software such as Photoshop.
For this trichrome, I used the Harris Shutter technique, which was invented by Robert Harris of Kodak for making colour photographs with the different primary colour layers exposed in separate time intervals in succession. Using an Olympus ECR35 35mm camera, I took three photos of the scene on black and white film (Rollei RPX400) with a red, green or blue filter in front of the lens. It took several seconds to change the filter, so moving subjects, such as clouds or people, appear in different positions and in different colours, while static subjects appear normal.
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