| 摘要 |
A method of producing a latent photograph by using a reproduction of the photograph in both negative and positive form, photographing both negative and positive in sequence and in register through a dark screen, having extremely small apertures and angled 30 DEG and 60 DEG in respect to the upper margin, the resulting latent photograph having a visual effect of being smooth and continuous is a reflection of the size and shape of the dots, lines, or tones, of both positive and negative reproductions, but reduced in size and changed in shape by the small apertures of the dark screen when photographed at two angles 30 DEG apart through the negative and positive reproductions; the latent photographs reflect only the positive end of the photographic scale and then only in percentages of from 1/10 of a percent to 5 percent representing the dots, lines, or tones of the positive and negative reproductions which varied in percentages of from 1% to 59% being positive in nature and from 60% to 99% being negative in nature; the visible tonal range of the latent photographs are rendered invisible or latent in form by the cancellation effect of the negative and positive dots, tones, or lines photographed next to or 30 DEG from each other; to view or see the latent photographs negative or positive, the dark screen is placed over the latent picture and turned to the appropriate angle, producing a visible photo of the negative in one case and a visible photo of the positive in the other; the visible photographs are a reflective match of the original reproductions, when in reality the dots, lines, or tones on the original reproductions, had both negative and positive aspects, with percentages of from 1% to 99% whereas the combination of the latent photograph and the dark screen reflects only negative aspects with percentages of from 95% to 99 9/10%.
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