Photographic process for the production of pictures of increased

Details Photographic process for the production of pictures of increased Photographic process for the production of pictures of increased

1977-02-18

1978-10-24

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 6, 96 27R, G03C 506, G03C 704

Patent

active

041219376

ABSTRACT:
In order to increase the contrast of a picture such as an X-ray picture over a selected range of densities, a negative transparency of the original picture of selected density value at one end of the selected range and a positive transparency of the original picture at the other end of the selected range are superimposed to form a transparency sandwich and the image produced by illuminating such a transparency sandwich is photographed or displayed. A number of selected density ranges may be superimposed on a single display by making a respective transparency sandwich for each range in a different color and superimposing such transparency sandwiches.

REFERENCES:
patent: 1967057 (1934-07-01), Irvine
patent: 2144066 (1939-01-01), Kindermann
patent: 2378213 (1945-06-01), Glashoe

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