Importance

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Abstract

A method is provided for analyzing the colour quality of a press pull as compared to a contract proof. The contract proof is scanned to create image data including colour data representing a scanned proof image. The press pull is also scanned to create image data including colour data representing a scanned press pull image. The scanned images are simultaneously displayed on a video monitor, and, the displayed images are searched for any significant differences in colour. A method is also provided for printing colour products on a colour printing press in a print run associated with a contract proof. The contract proof is scanned to create image data including colour data representing a scanned proof image. A sample printed colour product from the press is also scanned to create image data including colour data representing a scanned press pull image. The scanned images are simultaneously displayed on a video monitor. The scanned images are aligned and linked. The colour data for each section of one image is automatically compared with the colour data for a linked corresponding section of the other image to determine whether any differences exceed a pre-determined threshold. A count indicative of the number of sections which are determined to exceed such threshold is maintained. It is determined whether the number of sections which exceed such threshold exceeds a pre-determined overall threshold to determine colour quality. If the overall threshold is not exceeded, the print run is continued. If the overall threshold is exceeded, the print run is temporarily stopped, the print variables are adjusted and the print run is resumed. The preceding steps are repeated from the remove sample step until the print run is complete. A system is provided for analyzing the colour quality of a press pull as compared to a contract proof comprising at least one scanner for scanning the contract proof and for scanning the press pull, an image comparator connected to the at least one scanner to receive the data for the scanned proof image and the scanned press pull image and a video monitor connected to the image comparator to receive the data for the scanned proof image and the scanned press pull image and to display the scanned images simultaneously.

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First Claim