Method of determining exposure time for photographic printer
AssigneeFuji Photo Film Co., Ltd.
InventorShohei Yamamoto
Life of this patent
Estimating the term…
Abstract
A method of determining exposure time for a photographic printer on the basis of a cubic function is provided. A plurality of test printings are conducted by using different print magnifications, in such a manner as to obtain the same density of test prints. Exposure times T during test printings are measured in correspondence with the print magnifications m. On the basis of the print magnifications m and the exposure times T, the exposure time is expressed as a cubic function (am.sup.3 +bm.sup.2 +cm+d) of the print magnification. An exposure time for actual printing is determined on the basis of the above-mentioned cubic function, and printing is effected.
Claims9
A method of determining an exposure time for a photographic printer which is applicable to a photographic printer capable of varying the print magnification, to determine an exposure time corresponding to a print magnification set during actual printing of said printer, comprising the steps of:
- conducting a plurality of test printings with different test print magnifications, in such a manner as to obtain an optimum test print each time;
- calculating a relationship between the test print magnifications and test exposure times corresponding to said test print magnifications by using a cubic function;
- and
- determining, on the basis of said relationship, said exposure time corresponding to said set print magnification.
A method of determining an exposure time for a photographic printer which is applicable to a photographic printer capable of varying the print magnification, to determine an exposure time corresponding to a print magnification set during actual printing of said printer, comprising the steps of:
- conducting at least four test printings with different test print magnifications, in such a manner as to obtain a test print having the same density each time;
- measuring test exposure times corresponding to said different print magnifications;
- calculating, on the basis of at least four sets of said test print magnifications and the corresponding test exposure times, an exposure time expressed as a cubic function of a print magnification;
- and
- determining on the basis of said cubic function, an exposure time corresponding to a set print magnification.
A method of determining an exposure time for a photographic printer which is applicable to a photographic printer capable of varying the print magnification, to determine an exposure time corresponding to a print magnification set during actual printing of said printer, comprising the steps of:
- conducting at least four test printings with different test print magnifications, in such a manner as to obtain a test print having the same density each time;
- measuring test exposure times corresponding to said different print magnifications;
- calculating, on the basis of at least four sets of said test print magnifications and the corresponding test exposure times, a relationship between the test exposure time and the test print magnification by using a cubic function;
- and
- determining, on the basis of said cubic function, the exposure time corresponding to the set print magnification.
Dependencies are inferred from the claim text.