G - Physics – 03 – B
Patent
G - Physics
03
B
88/65, 95/34.2
G03B 27/56 (2006.01) G03B 27/32 (2006.01) G03B 27/73 (2006.01)
Patent
CA 1176895
-25- Abstract of the Disclosure Subtractive filters are moved into and outfrom the light path between a lamp and a supported color transparency in a color enlarger to provide three separate exposures for the colors red, green and blue. Operator setable means provides an exposure time for each color exposure based on the color density of a standardized transparency, balance means adjusts the exposure time for each color exposure to compoensate for differences in color density between the standardized transparency and a transparency from which a color print is to be made. The balance means includes a light intensity sensor means between the transparency and the lens. Magenta and yellow filters are moved together into the light path to produce the color red. Yellow and cyan filters produce the color green. Cyan and magenta filters produce the color blue. At the end of the red exposure the cyan filter is moved back into the white light path before the yellow filter is withdrawn. At the end of the green exposure the yellow and cyan filters are delayed in the white light path until all white light has disappeared. A portion of the magenta filter is moved into the light path during the green exposure and a portion of the yellow filter is moved into the light path during the green exposure. This shutters off some of the light, permitting an increase in the exposure time for the colors green and blue.
377423
Gowling Lafleur Henderson Llp
Labrum Ervin D.
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