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| | A Limitation of Color Photography |
 | | In fl and white photography, changing the contrast of a photograph to fit it within the dynamic range of any reproduction medium is a simple and standard procedure. |
 | | Color film, however, does not glow, so instead of starting with a fl screen, and adding red, green, and blue light to produce the desired mixture, one has to start with white paper, subtracting red, green, and blue light from what is reflected. |
 | | If one overlays a color image with a negative fl-and-white image of the same scene, or if one processes the image with a computer, however, it is possible to reduce the contrast between different points of the image in overall brightness, while maintaining the color at any given point. |
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