Abstract: In a data transmission apparatus, each dot data element is one of a predetermined number of kinds. The data transmitting apparatus includes a template-data generating portion generating template data from the image data by initially determining one of the kinds of dot data element that most frequently occurs in each of one of the rows and the columns and then sequencing the most frequently occurring kinds of dot data elements determined in a direction of the other of the rows and the columns, a data-block generating portion generating a data block by sequencing in the direction of the other of the rows and the columns codes each indicative of a difference between one of the dot data elements of a kind in the image data as stored in the storing portion and one of the dot data elements of a kind in the template data.

Abstract: A system and method for infrared watermarking using gray component replacement and other color removal schemes is shown. This method includes providing a substrate and implementing two infrared absorption strategies, one with low infrared absorption and the other with high infrared absorption. These two strategies are then combined in order to form two gamuts with substantially similar shapes. This combination can be made by blending the gamuts at areas where one of the strategies do not meet or implementing the intersection of the two gamuts. A watermark is then printed along with an image. The resultant image with watermark is void of artifacts while still having a consistent watermark signal.

Abstract: A method processes image data in a color separation to attenuate printing defects arising from misalignment of serially arranged printheads that eject ink for the color separation. The method includes processing image values of the color separation with a first rendering process that corresponds to one printhead in a plurality of serially arranged printheads for printing the color separation, processing the image values of the color separation with a second rendering process that differs from the first rendering process for at least one other printhead in the plurality of serially arranged printheads for printing the color separation, generating firing signals for the one printhead from the rendered image values generated by the first rendering process, and generating firing signals for the at least one other printhead from the rendered image values generated by the second rendering process.