Radiation imagery chemistry: process – composition – or product th – Including control feature responsive to a test or measurement
Reexamination Certificate
1998-11-03
2001-02-27
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Including control feature responsive to a test or measurement
C430S359000, C430S362000
Reexamination Certificate
active
06194107
ABSTRACT:
The present invention relates to a method for producing a set of exposed photographic colour negatives suitable for use in calibrating a developing and a printing machine system for making photographic colour prints. The present invention also relates to the use of the set of exposed negatives thus produced for calibrating a developing and a printing machine system for making photographic colour prints.
The calibration of a developing/printing machine system is an ever lasting problem in the art of making photographic colour prints. As a matter of fact, all the calibration methods presently used are unsatisfactory, mainly in that they cannot avoid that substantial differences occur in the quality of the photographic colour prints produced.
The MSP printing machines commercially used are usually supplied with three calibration negative film strips which have been exposed and developed by the manufacturer. The exposures are carried out at standardised levels of normal (N), over (O) and under (U) exposure. The specific development conditions at the photolaboratory of the customer are not taken into account and the reproducibility of the printing quality is poor. Even shortly after the printing machine has been calibrated the printing quality can be unsatisfactory.
An alternative calibration technique is provided by the colour kits of Kodak and Fuji which comprise exposed negative strips for calibrating the developer machine as well as the printing machine of a photolaboratory. The exposed negative strips contain a grey reference circle which has been introduced into the negative afterwards by means of a digitised technique. The difference between the grey colour in the original negative and the grey colour of the digitised reference circle will result in that a good reproducibility of the printing quality cannot be obtained.
Finally, several attempts have been made in order to calibrate printing machines by means of negative films which have been submitted to arbitrarily chosen exposure conditions. However, large density fluctuations in the printing quality have been experienced.
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patent: 2 602 596 (1988-02-01), None
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“Film Printer Balancing Kit.”Research Disclosure. No. 325. May 1, 1991. XP000229715.
Hendrix H. G. M.
Sparidaens P. J. A. M.
Fuji Photo Film B.V.
Le Hoa Van
Merchant & Gould P.C.
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