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Eberhard effect

Another manifestation of adjacency effects. A series of photographic line images of various widths, all exposed with equal intensities. As the lines become narrower, the concentration of reaction products is reduced, and thus the narrower lines develop to a higher density than do the wider lines. This effect would be expected to continue with successive narrowing until one reached the width of the spread function of the system, including film, used to expose the line. Beyond this point, the effects of the spread function of the system dominate, and light scattering decreases the true light exposure in the film, but the size of the image is not smaller than the spread function of the system.

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