Abstract:
A technique for making multiple copies that includes the steps of scanning a scan region that contains the image to be copied to produce an array of scan region pixel data that contains pixel data for the entire scan region; printing an image based on the array of scan region pixel data; processing the scan region pixel data to determine a subregion of the scan region that contains printable, non-background information; scanning the subregion of the scan region and providing to a print buffer print data only for the subregion of the scan region that contains printable, non-background information; and printing an image based on the subregion print data.
Abstract:
A technique for making multiple copies that includes the steps of scanning a scan region that contains the image to be copied to produce an array of scan region pixel data that contains pixel data for the entire scan region; printing an image based on the array of scan region pixel data; processing the scan region pixel data to determine a subregion of the scan region that contains printable, non-background information; scanning the subregion of the scan region and providing to a print buffer print data only for the subregion of the scan region that contains printable, non-background information; and printing an image based on the subregion print data.
Abstract:
An image that includes black-and-white text—from which most chromatic-colorant data in text areas have already been stripped—is enhanced by removing all chromatic-colorant data from a region of the image data array, independent of object type. Removal occurs only if color-data conditions are met; the data array is then applied to print the image. The system includes storage and automatic retrieval of instructions for automatically evaluating the condition, removing chromatic-colorant data, and applying the color-stripped data in printing. The conditions include whether the amount of chromatic-colorant data in (A) the region is less than a certain threshold; (B) an entire row immediately above the region is less than a second threshold; (C) a region adjacent to the region is less than a third threshold; and (D) a vertical column above the particular region exceeds a fourth threshold. In this last case the system counts a number of consecutive regions, vertically above the region, from which chromatic-colorant data have been removed; and then refrains from removing chromatic-colorant data from the region if the count exceeds the fourth threshold. The system thus limits the effect of the first three conditions, to deter chromatic-colorant removal from a substantially continuous thin vertical chromatic-color line. The four thresholds are disclosed and explained.