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COLOR CORRECTION FOR A SLIDE PRINTER

IP.com Disclosure Number: IPCOM000023624D
Original Publication Date: 1978-Aug-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 206K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a color electrophotographic printing machine, color slides may be reproduced, Hereinbefore, color correction was achieved by employing color filters and neutral density filters during the imaging cycle. In operation, the printing machine forms successive, single color light images by inter-posing successive color filters into the optical light path. These single color light images require color correction due to the characteristics of the slide. This may be achieved by interposing a second color correction filter into the optical light path during the formation of one of the single color light images. Alternatively, color correction may be obtained by cycling an aperture in front of the slide projector lens. A powered aperture may be positioned in the optical light path to provide varying amounts of light depending upon an operator adjustable setting or automatically in response to the amount of light detected by a light detector. A system of this type regulates the amount of light by adjusting the aperture and does not introduce image degradations inherent in the use of neutral density filters. Thus, the overall exposure balance can be optimized.

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XEROX DISCLOSURE JOURNAL

COLOR CORRECTION FOR A SLIDE Proposed Classification
PRINTER U.S. Cl. 355/4
J. E, Bollman mt. Cl. G03g 15/01
L. D. Mailloux

In a color electrophotographic printing machine, color slides
may be reproduced, Hereinbefore, color correction was
achieved by employing color filters and neutral density
filters during the imaging cycle. In operation, the printing
machine forms successive, single color light images by inter~
posing successive color filters into the optical light path.
These single color light images require color correction due
to the characteristics of the slide. This may be achieved by
interposing a second color correction filter into the optical
light path during the formation of one of the single color
light images. Alternatively, color correction may be obtained
by cycling an aperture in front of the slide projector lens. A
powered aperture may be positioned in the optical light path
to provide varying amounts of light depending upon an operator
adjustable setting or automatically in response to the amount
of light detected by a light detector. A system of this type
regulates the amount of light by adjusting the aperture and
does not introduce image degradations inherent in the use of
neutral density filters. Thus, the overall exposure balance
can be optimized.

Volume 3 Number 4 July/August 1978 265

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