Abstract: A method creates printing data applied to a printer that is capable of generating different sizes of ink drops. Firstly, a halftoning threshold table is created based on all possible combinations that are determined based on the quantity of the printheads and the sizes of ink drops quantity provided by each printhead. When the image data to be printed is received, each pixel of an image will correspond to one combination based on the halftoning threshold table. The corresponding combination is deemed as a halftoning encoded data and represented by several bits. These bits can be separated into plural groups, where the bits contained in each group are for driving a specific printhead. That is to say, each printhead has its own driving data so that the printing process will have superior efficiency.

Abstract: An image processing mechanism combines the halftone method and image enhancement technique for processing halftone and improving image performance. The mechanism includes an image input module, an image enhancement module and a halftone module. The image input module sends the original image data to the image enhancement module to enhance the image by filtering. The halftone module processes the enhanced image data by the algorithm of error diffusion. It combines two different processes into one mechanism to simplify the hardware architecture and to decrease the usage of memory.

Abstract: A method and apparatus for detecting faulty nozzles is applied to a multi-function peripheral (MFP). The method is to print a predefined test pattern by an inkjet component of a printing unit. A scanning unit connecting with the printing unit scans the predefined test pattern to generate an image data of the predefined test pattern. Afterwards, an analyzing unit analyzes the image data of the predefined test pattern to see if any one of the nozzles is clogged. Finally, the analyzing unit reports the result to the printing unit. The printing unit will avoid using the clogged nozzles during the printing process to improve the quality of printing.

Abstract: A compound inkjet print head printer has a compound print head module. The compound print head module includes at least two inkjet print heads for providing ink droplets of one color but with different sizes. Since the compound inkjet print head module provides different sizes of ink droplets in a swath, the number of print swaths can be decreased. The compound inkjet print head printer increases a printing speed with high photo quality.

Abstract: A method of arranging orifices on a print head and the corresponding structure. The invention uses a design that changes relative positions of orifices on a print head so that different ink droplets for the same pixel fall in different areas of the pixel. The printing quality is enhanced because of a more homogeneous distribution of the ink droplets.

Abstract: A method of arranging orifices on a print head and the corresponding structure. The invention uses a design that changes relative positions of orifices on a print head so that different ink droplets for the same pixel fall in different areas of the pixel. The printing quality is enhanced because of a more homogeneous distribution of the ink droplets.