Method for including traditional photographic calibration into digital color management
First Claim
1. A method for including photographic calibration from a photographic process into digital color management having an abstract color transformation profile operative in a profile connection space, the method comprising the steps of:
- (a) measuring density values from one or more density patches on a test image produced by the photographic process and which represents an optical process aim, thereby providing measured density data;
(b) providing a transform for transforming between density data and colorimetry data based on spectrophotometric data of a particular paper representative of typical dye sets used in the photographic process, wherein the transform is operative in a CIE psychometric lightness space;
(c) providing a 3-dimensional table having table values for uniformly sampling the profile connection space;
(d) converting the table values into a lightness function;
(e) transforming the table values into a density function using said transform provided in step (b);
(f) finding table values corresponding to physically realizable colors;
(g) adjusting the table values corresponding to physically realizable colors to the optical process aim by 1-D interpolation from a digital process aim using the measured density values from step (a);
(h) transforming the adjusted table values back to colorimetric values by using an inverse of said transform provided in step (b);
(i) transforming the colorimetric values to the profile connection space by using a relationship inverse to that used in step (d); and
(j) saving the transformed colorimetric values as an abstract color transformation profile.
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Abstract
A method for including photographic calibration into digital color management having an abstract color transformation profile, the method comprises the steps of measuring a density from a patch of an optically created image; inputting the measured densities to a computer workstation; computing a density to colorimetry matrix that is received by the computer workstation; and interpolating the matrix based on the inputted density for creating the abstract profile for ultimately permitting modification of an image manipulated by the abstract profile.
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Citations
6 Claims
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1. A method for including photographic calibration from a photographic process into digital color management having an abstract color transformation profile operative in a profile connection space, the method comprising the steps of:
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(a) measuring density values from one or more density patches on a test image produced by the photographic process and which represents an optical process aim, thereby providing measured density data;
(b) providing a transform for transforming between density data and colorimetry data based on spectrophotometric data of a particular paper representative of typical dye sets used in the photographic process, wherein the transform is operative in a CIE psychometric lightness space;
(c) providing a 3-dimensional table having table values for uniformly sampling the profile connection space;
(d) converting the table values into a lightness function;
(e) transforming the table values into a density function using said transform provided in step (b);
(f) finding table values corresponding to physically realizable colors;
(g) adjusting the table values corresponding to physically realizable colors to the optical process aim by 1-D interpolation from a digital process aim using the measured density values from step (a);
(h) transforming the adjusted table values back to colorimetric values by using an inverse of said transform provided in step (b);
(i) transforming the colorimetric values to the profile connection space by using a relationship inverse to that used in step (d); and
(j) saving the transformed colorimetric values as an abstract color transformation profile. - View Dependent Claims (2, 3)
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4. A computer program product for including photographic calibration from a photographic process into digital color management having an abstract color transformation profile operative in a profile connection space, said computer program product comprising:
- a computer readable storage medium having a computer program stored thereon for performing the steps of;
(a) measuring density values from one or more density patches on a test image produced by the photographic process and which represents an optical process aim, thereby providing measured density data;
(b) providing a transform for transforming between density data and colorimetry data based on spectrophotometric data of a particular paper representative of typical dye sets used in the photographic process, wherein the transform is operative in a CIE psychometric lightness space;
(c) providing a 3-dimensional table having table values for uniformly sampling the profile connection space;
(d) converting the table values into a lightness function;
(e) transforming the table values into a density function using said transform provided in step (b);
(f) finding table values corresponding to physically realizable colors;
(g) adjusting the table values corresponding to physically realizable colors to the optical process aim by 1-D interpolation from a digital process aim using the measured density values from step (a);
(h) transforming the adjusted table values back to colorimetric values by using an inverse of said transform provided in step (b);
(i) transforming the colorimetric values to the profile connection space by using a relationship inverse to that used in step (d); and
(j) saving the transformed colorimetric values as an abstract color transformation profile. - View Dependent Claims (5, 6)
- a computer readable storage medium having a computer program stored thereon for performing the steps of;
Specification