Coordinating the functioning of a color control system and a defect detection system for a printing press

A method of coordinating the use of a color control system and a defect detection system on a printing press having a plurality of ink key zones and printing using a plurality of ink colors, the method comprising:

• acquiring image data from a printing press,
• determining an actual color difference between the acquired image data and template image data representative of a desired image for each of a plurality of pixels,
• summing the actual color differences of the plurality of pixels to obtain a sum of defects,
• computing ink key adjustments for each ink key zone and for each color from the actual color differences,
• computing predicted image data from the ink key adjustments,
• determining a predicted color difference between the predicted image data and the template image data for each of the plurality of pixels,
• summing the predicted color differences of the plurality of pixels to obtain a residual error, and
• enabling and disabling the outputs of the color control system based on the sum of defects and the residual error.

A method of coordinating the use of a color control system and a defect detection system on a printing press having a plurality of ink key zones and printing using a plurality of ink colors, the method comprising:

• acquiring image data from a printing press,
• determining an actual color difference between the acquired image data and template image data representative of a desired image for each of a plurality of pixels,
• summing the actual color differences of the plurality of pixels to obtain a sum of defects,
• computing ink key adjustments for each ink key zone and for each color from the actual color differences,
• computing predicted image data from the ink key adjustments,
• determining a predicted color difference between the predicted image data and the template image data for each of the plurality of pixels,
• summing the predicted color differences of the plurality of pixels to obtain a residual error,
• enabling and disabling the outputs of the defect detection system based on the sum of the defects and the residual error, and
• enabling and disabling the outputs of the color control system based on the sum of defects and the residual error.

A method of coordinating the utilization of a color control system and a defect detection system on a printing press, the method comprising:

• storing template image data having values in a predetermined color space,
• acquiring an image from a web in the printing press and generating acquired image data having values in the same predetermined color space,
• determining an actual color difference between the acquired image data and the corresponding template image data for each of a plurality of pixels,
• summing the actual color differences of the plurality of pixels to obtain a sum of defects,
• computing ink key adjustments from the actual color differences,
• computing predicted image data in the same predetermined color space from the ink key adjustments,
• determining a predicted color difference between the predicted image data and the template image data for each of the plurality of pixels,
• summing the predicted color differences of the plurality of pixels to obtain a residual error,
• enabling and disabling the outputs of the defect detection system based on the sum of defects and the residual error;
• and
• enabling and disabling the outputs of the color control system based on the sum of defects and the residual error.