Crosstalk correction
AssigneeCymbolic Sciences Inc.
InventorsFred Fang Cao, Horst W. Schaaf, Susan Shuping Zhang
Life of this patent
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Abstract
A method of crosstalk correction comprises producing a calibration image having different printed image densities in grayscale, measuring the printed image densities at the different light exposure values to obtain a correlation of printed density in grayscale as a function of light exposure value over a range of light exposure values, obtaining experimental analytical density values for a selected light exposure value within the range of light exposure values and using the correlation of printed density as a function of light exposure value and the experimental analytical density values to correct for crosstalk.
Claims10
A method of correcting crosstalk in a colour printing process using a colour photographic medium having a plurality of light sensitive dyes, each dye having an associated complimentary colour light associated therewith and at least one non-complimentary colour light associated therewith, each dye primarily absorbing the complimentary light associated therewith, comprising the steps of:
- producing a calibration image having different printed image densities in grayscale by exposing the photographic medium to light comprising said complimentary and non-complimentary colours, in a range of different light exposure values;
- measuring the printed image densities at the different light exposure values to obtain a correlation of printed density in grayscale as a function of light exposure value over a range of light exposure values for each of the complimentary and non-complimentary colours;
- producing an analytical density test image for each of said complimentary and non-complimentary colours by exposing the photographic medium successively to light of each of said complimentary and non-complimentary colours for a selected light exposure value within said range of light exposure values;
- measuring the analytical density contributed by each of said complimentary and non-complimentary colours, respectively, from said test images;
- and
- using said correlation of printed density as a function of light exposure value and said measured analytical density to correct for crosstalk.
A method of correcting crosstalk in a colour printing process using a colour photographic medium having a plurality of light sensitive dyes, each dye having an associated complimentary colour light associated therewith and at least one non-complimentary colour light associated therewith, each dye primarily absorbing the complimentary light associated therewith, comprising the steps of:
- producing a calibration image having different printed image densities in grayscale by exposing the photographic medium to light comprising said complimentary and non-complimentary colours, in a range of different light exposure values;
- measuring the printed image densities at the different light exposure values to obtain a correlation of printed density in grayscale as a function of light exposure value over a range of light exposure values for each of the complimentary and non-complimentary colours;
- producing an analytical density test image for each of said complimentary and non-complimentary colours by exposing the photographic medium successively to light of each of said complimentary and non-complimentary colours for a range of light exposure values;
- measuring the analytical density contributed by each of said complimentary and non-complimentary colours, respectively, from said test images to obtain a correlation of analytical density as a function of light exposure value over a range of light exposure values for each of said complimentary and non-complimentary colors;
- and
- using said correlations of printed density as a function of light exposure value and said correlation of analytical density as a function of light exposure value to correct for crosstalk.
Dependencies are inferred from the claim text.