Delta E formula match prediction
AssigneeX-Rite, Incorporated
InventorsRobert Willis, Thomas Michaels
Life of this patent
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Abstract
A method of determining a color formula for a target color begins with generating a plurality of candidate color formulas to reproduce the target color. For each candidate formula, a predicted delta E indicating a difference from a predicted color for the candidate formula from the target color is determined. Also for each candidate formula, a confidence value in the predicted delta E is generated by summing weighted figures of merit for each colorant in the candidate formula. The weighting of the figures of merit represents each colorant's proportion in the candidate formula. A formula is then selected based on the predicted delta E and confidence value. The target color may be defined in terms of a multi-dimensional color space.
Claims14
A computer implemented method of determining a color formula for a target color, comprising:
- generating a plurality of candidate color formulas to reproduce the target color by a color formulation engine;
- for each candidate formula, determining a predicted delta E indicating a difference from a predicted color for the candidate formula from the target color;
- for each candidate formula, the color formulation engine generating a confidence value in the predicted delta E by summing weighted figures of merit for each colorant in the candidate formula, wherein the weighting of the figures of merit represents each colorant's proportion in the candidate formula;
- and
- ranking candidate formulas based on the predicted delta E and confidence value;
- wherein the figure of merit for each colorant comprises an average standard deviation (PSD) of the colorant's predicted spectral response relative to spectral measurements of a plurality of samples of the colorant, where the samples are prepared at different colorant concentrations.
A system for determining a color formula to match a target color, comprising a computing device having non-volatile instructions that, when executed by a processor, cause the computing device to:
- generate a plurality of candidate color formulas to reproduce the target color;
- for each candidate formula, determine a predicted delta E indicating a difference from a predicted color for the candidate formula from the target color;
- for each candidate formula, generate a confidence value in the predicted delta E by summing weighted figures of merit for each colorant in the candidate formula, wherein the weighting of the figures of merit represents each colorant's proportion in the candidate formula;
- and
- indicate a formula to use based on the predicted delta E and confidence value;
- wherein the figure of merit for each colorant comprises an average standard deviation (PSD) of the colorant's predicted spectral response relative to spectral measurements of a plurality of samples of the colorant, where the samples are prepared at different colorant concentrations.
A computer implemented method of determining a color formula for a target color, comprising:
- generating a plurality of candidate color formulas to reproduce the target color by a color formulation engine;
- for each candidate formula, determining a predicted delta E indicating a difference from a predicted color for the candidate formula from the target color;
- for each candidate formula, the color formulation engine generating a confidence value in the predicted delta E by summing weighted figures of merit for each colorant in the candidate formula, wherein the weighting of the figures of merit represents each colorant's proportion in the candidate formula as generated by the color formulation engine;
- and
- ranking candidate formulas based on the predicted delta E and confidence value;
- wherein the figure of merit comprises an average delta E (pΔE) of a colorant's predicted color relative to spectral measurements of the colorant's samples.
Dependencies are inferred from the claim text.