Method for computing main, flash and bump exposures for direct screening

Claim 1

A method for computing main, flash and bump exposures for direct screening comprising the steps of: a. preparing a graph of experimental values giving as parameters densities of highlight, intermediate tone and shadow areas of an original plotted respectively against dot percent and parallelly shifting, the curves representing the relation between the dot percent and the density of the original at varying bump exposure percents to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of bump exposure showing the relation between the dot percent and density difference, b. determining from the graph of bump exposure values of coefficient to obtain an equation of lower degree for computing a bump exposure percent, c. parallelly shifting curves in the graph of experimental values representing the relation between the dot percent and the density of the original at varying amounts of flash exposure to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of flash exposure showing the relation between the dot percent and density difference, d. determining from the graph of flash exposure valUes of coefficients to obtain an equation of lower degree for computing an amount of flash exposure, e. forming an equation of lower degree for computing an amount of main exposure from an energy of light providing a predetermined density to the original, the effects of the bump exposure and flash exposure on the intermediate tone area, the sensitivity of a negative film including the conditions for developing the same, the diaphragm aperture value for setting the amount of the main exposure, the variation of the dot percent set for the intermediate tone area from the 50% point, and determined coefficients f. forming an equation of lower degree for computing an amount of bump exposure from the amount of main exposure, the bump exposure percent, a film speed for each color plate and developing conditions, g. forming an equation of lower degrees for computing the diaphragm aperture value for main exposure photography from the main exposure amount computing equation, h. forming an equation of lower degree for computing the diaphragm aperture value for bump exposure from the bump exposure amount computing equation, and i. feeding the foregoing parameters and the determined coefficients in a desired combination to a computer incorporating electrical digital computing circuits for calculating from the equations the main, flash, and bump exposure amounts for direct screening.

Claim 2

A method for computing main, flash and bump exposures for direct screening comprising the steps of: a. preparing a graph of experimental values giving as parameters densities of highlight, intermediate tone and shadow areas of an original plotted respectively against dot percent and parallelly shifting, the curves representing the relation between the dot percent and the density of the original at varying bump exposure percents to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of bump exposure showing the relation between the dot percent and density difference, b. determining from the graph of bump exposure values of coefficient to obtain an equation of lower degree for computing a bump exposure percent, c. parallelly shifting curves in the graph of experimental values representing the relation between the dot percent and the density of the original at varying amounts of flash exposure to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of flash exposure showing the relation between the dot percent and density difference, d. determining from the graph of flash exposure valUes of coefficients to obtain an equation of lower degree for computing an amount of flash exposure, e. forming an equation of lower degree for computing an amount of main exposure from an energy of light providing a predetermined density to the original, the effects of the bump exposure and flash exposure on the intermediate tone area, the sensitivity of a negative film including the conditions for developing the same, the diaphragm aperture value for setting the amount of the main exposure, the variation of the dot percent set for the intermediate tone area from the 50% point, and determined coefficients f. forming an equation of lower degree for computing an amount of bump exposure from the amount of main exposure, the bump exposure percent, a film speed for each color plate and developing conditions, g. forming an equation of lower degrees for computing the diaphragm aperture value for main exposure photography from the main exposure amount computing equation, h. forming an equation of lower degree for computing the diaphragm aperture value for bump exposure from the bump exposure amount computing equation, and i. feeding the foregoing parameters and the determined coefficients in a desired combination to a computer incorporating electrical digital computing circuits for calculating from the equations the main, flash, and bump exposure amounts for direct screening.

Claim 3

A method for computing main, flash and bump exposures for direct screening comprising the steps of a. preparing a graph of experimental values giving as parameters densities of highlight, intermediate tone and shadow areas of an original plotted respectively against dot percents and parallelly shifting the curves representing the relation between the dot percent and the density of the original at varying bump exposure percents to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of bump exposure showing the relation between the dot percent and density difference; b. determining from the graph of bump exposure values of coefficients a1-a6 of an equation for computing a percent of bump exposure: Alpha 1/Dmh (a1 - a2.Dmh + Square Root a3 + (a4 - a5.Yh) Dmh - a6.Dmh2); c. parallelly shifting curves in the graph of experimental values representing the relation between the dot percent and the density of the original at varying amounts of flash exposure to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of flash exposure showing the relation between the dot percent and density difference; d. forming determing from the graph of flash exposure values of coefficients b1 - b4 of an equation for computing an amount of flash exposure: Beta b1.Dsm - b2.Ys + b3/Dsm + b4; e. forming from an energy of light providing a predetermined density to the original, the effects of the bump and flash exposures on the intermediate tone area, the sensitivity of a negative film including the conditions for developing it, the diaphragm aperture value for setting the amount of the main exposure, a photography magnification, the variation of the dot percent set for the intermediate tone area from the 50% point and determined coefficients c2 and c3 an equation for computing an amount of main exposure: Mx Fx2/Fs2.E.10Dm.(1-1/ gamma m. Delta Ym).(N+1)2/4.10 (c c ) f. forming from the amount of main exposure, the percent of bump exposure and the amount of bump exposure An equation for computing a diaphragm aperture value for bump exposure: FH Fs Square Root H/Ho; g. feeding the parameters and the sets of determined coefficients in a desired combination to a computer incorporating electrical digital computing circuits for calculating from the equations the main, flash and bump exposure amounts for direct screening.

Claim 4

A method for computing main, flash and bump exposures for direct screening comprising the steps of a. preparing a graph of experimental values giving as parameters densities of highlight, intermediate tone and shadow areas of an original plotted respectively against dot percents and parallelly shifting the curves representing the relation between the dot percent and the density of the original at varying bump exposure percents to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of bump exposure showing the relation between the dot percent and density difference; b. determining from the graph of bump exposure values of coefficients a1-a6 of an equation for computing a percent of bump exposure: Alpha 1/Dmh (a1 - a2.Dmh + Square Root a3 + (a4 - a5.Yh) Dmh - a6.Dmh2); c. parallelly shifting curves in the graph of experimental values representing the relation between the dot percent and the density of the original at varying amounts of flash exposure to concentrate their 50% points at the 50% point of a curve representing the case in which only a main exposure is made and to thereby obtain a graph of flash exposure showing the relation between the dot percent and density difference; d. forming determing from the graph of flash exposure values of coefficients b1 - b4 of an equation for computing an amount of flash exposure: Beta b1.Dsm - b2.Ys + b3/Dsm + b4; e. forming from an energy of light providing a predetermined density to the original, the effects of the bump and flash exposures on the intermediate tone area, the sensitivity of a negative film including the conditions for developing it, the diaphragm aperture value for setting the amount of the main exposure, a photography magnification, the variation of the dot percent set for the intermediate tone area from the 50% point and determined coefficients c2 and c3 an equation for computing an amount of main exposure: Mx Fx2/Fs2.E.10Dm.(1-1/ gamma m. Delta Ym).(N+1)2/4.10 (c c ) f. forming from the amount of main exposure, the percent of bump exposure and the amount of bump exposure An equation for computing a diaphragm aperture value for bump exposure: FH Fs Square Root H/Ho; g. feeding the parameters and the sets of determined coefficients in a desired combination to a computer incorporating electrical digital computing circuits for calculating from the equations the main, flash and bump exposure amounts for direct screening.