Method of and apparatus for processing image and correction chart employed in the apparatus
First Claim
1. A method of electronically processing an image, said method comprising:
- a first process for measuring respective spectral densities of a calibration chart having at least three regions where respective ones of three primary color dyes in a color photosensitive material are developed;
a second process for determining dye-quantity data, indicative of the quantity of the primary color dyes in said regions, from the spectral densities obtained in said first process;
a third process for determining color correction data from density data of said regions, said density data being obtained by reading said calibration chart with an image reading apparatus, and from said dye-quantity data, said dye-quantity data being obtained in said second process; and
a fourth process for correcting density data obtained by reading an original having the same color development characteristic as that of said calibration chart with said image reading apparatus, by making use of said color correction data obtained in said third process.
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Abstract
Disclosed herein are a method of and an apparatus for electrically processing an image, and a calibration chart used in the apparatus. This method comprises a first process for measuring respective spectral densities of a calibration chart having at least three regions at which respective ones of three primary color dyes in a color photosensitive material are developed, a second process for determining data indicative of the quantity of the three primary color dyes in the regions from the spectral densities obtained in the first process, a third process for determining color calibration data from density data of the regions, the density data being obtained by reading the calibration chart with an image reading apparatus, and the data indicative of the quantity of the primary color dyes in the regions, the data being obtained in the second process, and a fourth process for correcting density data obtained by reading an original having the same color development characteristic as that of the calibration chart with the image reading apparatus, by making use of the color correction data obtained in the third process. In addition, the apparatus comprises a dye-quantity data storage unit, an original reading unit, a color calibration data arithmetic unit, a color calibration data storage unit and a calibration density data arithmetic unit.
102 Citations
13 Claims
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1. A method of electronically processing an image, said method comprising:
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a first process for measuring respective spectral densities of a calibration chart having at least three regions where respective ones of three primary color dyes in a color photosensitive material are developed; a second process for determining dye-quantity data, indicative of the quantity of the primary color dyes in said regions, from the spectral densities obtained in said first process; a third process for determining color correction data from density data of said regions, said density data being obtained by reading said calibration chart with an image reading apparatus, and from said dye-quantity data, said dye-quantity data being obtained in said second process; and a fourth process for correcting density data obtained by reading an original having the same color development characteristic as that of said calibration chart with said image reading apparatus, by making use of said color correction data obtained in said third process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processing apparatus comprising:
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means for storing therein dye-quantity data, indicative of the quantity of dyes in respective regions of a calibration chart having at least three regions where respective ones of three primary color dyes in a color photosensitive material are developed; means for reading said calibration chart and an original having the same color development characteristic as that of said calibration chart; color-correction data arithmetic means for computing color correction data from density data obtained by reading said calibration chart with said reading means, and said dye-quantity data stored in said storing means; mean for storing therein said color correction data; and correction density data arithmetic means for computing correction density data from density data obtained by reading said original with said reading means and said color correction data stored in said color correction data storing means, wherein said original and said color calibration chart are disposed within cassettes. - View Dependent Claims (10, 11, 12, 13)
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Specification