Abstract: A method for driving an electro-optic display having a plurality of display pixels, the method includes dithering a grayscale image into a black and white image, updating the plurality of display pixels to display the black and white image, and converting the black and white image back to the grayscale image.

Abstract: A method for driving an electro-optic display having a plurality of display pixels, the method includes dithering a grayscale image into a black and white image, updating the plurality of display pixels to display the black and white image, and converting the black and white image back to the grayscale image.

Abstract: The automatic generation and use of halftone supercell threshold arrays suitable for high addressability output devices, particularly ones with constraints on sub-pixel combinations or geometries is disclosed. An example of a high addressability device is a laser printer using a pulse width modulator. The invention can further extend the usefulness of supercell halftone screening systems.

Abstract: At least two different pixel clock frequencies or pixel pitches are used when generating an image. They are used with periodic halftone patterns in a color scanning printing process. By using different clock frequencies for the different color separations, more options for screen geometry are available, and therefore new screen sets with desirable moiré behavior are possible. This is especially important on low resolution devices, such as 1200 dpi and below. Here there are a limited number of rational tangent screen geometries that are available and moiré canceling or moiré averting combinations are scarce. The different pixel clock frequency are used when writing at least two color channels in order to provide otherwise unavailable halftone geometries.