Browse Prior Art Database

Production Color Control Process

IP.com Disclosure Number: IPCOM000074063D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Anderson, DA: AUTHOR

Abstract

This process uses the predictive ability of the applicable color prediction model to adjust mathematically for the small variation in color difference between the known standard and the production batch. Compensation is made for small inherent errors that occur within the color prediction model.

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Production Color Control Process

This process uses the predictive ability of the applicable color prediction model to adjust mathematically for the small variation in color difference between the known standard and the production batch. Compensation is made for small inherent errors that occur within the color prediction model.

In the flow chart for this process, symbols are used as follows: n - No. colorants in formula E(n) - Prediction error = B(n)-P(n) S(n)-Predicted % std. conc. D(n)-Conc. variance = S(n)-P(n) B(n)-Colorant Conc. in actual C(n)-Batch adjustment quantity = batch D(n)+E(n) P(n)-Predicted % conc. for batch A(n)- Batch additions quantity.

This process begins by reading the reflectance curve for the standard to be matched into the computer. From this curve, a color prediction model solves for S(n), for colorant in the formula. Each S(n) is stored. The actual batch reflectance curve is read into the computer next. The match of that curve is checked for tolerance acceptability. This check is based on a color difference calculation or visual comparison. If no satisfactory match is obtained, the same color prediction model solves for P(n), for each batch colorant. Each P(n) value is stored. B(n) is entered into the computer and stored. Then, for each colorant, E(n) is obtained by subtracting P(n) from B(n) values in storage. A large prediction error, E(n), can indicate omission of a colorant from the batch. The batch adjustment quantity, C(n), for eac...