Abstract: Disclosed are methods of halftoning images having multiple color planes using error diffusion techniques, and incorporating both error information from the previously-processed color planes of a pixel, and error information from a previously process pixel of yet-to-be processed color planes.

Abstract: A device for the electrodeionisation of an aqueous electrolyte solution, comprising an electrodeionisation module (1), an ultrafiltration module (21, 22, 1201, 1202, 1203) and a connection piece (3, 10) which connects the electrodeionisation module (1) and the ultrafiltration module (21, 22, 1201, 1202, 1203) such as to be able to guide a diluate produced from said electrolyte solution during operation of said device in said electrodeionisation module (1) from said electrodeionisation module (1) to said ultrafiltration module (21, 22, 1201, 1202, 1203); wherein said connection piece (3, 10) comprises no adjustable pressure-maintaining valve. By means of the pressure drop occurring in the ultrafiltration modules (21, 22, 1201, 1202, 1203) these devices build up a counter pressure behind the electrodeionisation module (1) which is sufficient to ensure the packing density of the ion exchanger in the electrodeionisation module (1).

Abstract: Tone dependent plane dependent error diffusion halftoning takes into account multiple color planes, such as cyan and magenta, when determining the placement of a dot in any of the color planes. The combined tones of the correlated color planes is used to determine the threshold levels against which the combined tones and the accumulated errors for the correlated color planes is compared. Further, tone dependent error weightings are determined based on the combined tones of the correlated color planes. The tone dependent error weightings are used to diffuse the final accumulated errors for each color plane. A prerendered mid-tone bitmap may be used to break up any structured patterns that occur in the mid-tones. Using this technique, printed dots of two or more colors are dispersed so as to avoid noticeable clumping of dots of two or more colors to provide a more uniform pattern and to avoid the unintentional overlapping of colors. This technique can be used to augment any existing error diffusion method.

Abstract: An indication of a target point in a first color space is received. A set of interpolation points in the first color space are identified from which to interpolate a value of the target point in a second color space. The set of interpolation points comprises at least one boundary point in a boundary surface defined by a colorant boundary.

Abstract: Tone dependent plane dependent error diffusion halftoning takes into account multiple color planes, such as cyan and magenta, when determining the placement of a dot in any of the color planes. The combined tones of the correlated color planes is used to determine the threshold levels against which the combined tones and the accumulated errors for the correlated color planes is compared. Further, tone dependent error weightings are determined based on the combined tones of the correlated color planes. The tone dependent error weightings are used to diffuse the final accumulated errors for each color plane. A prerendered mid-tone bitmap may be used to break up any structured patterns that occur in the mid-tones. Using this technique, printed dots of two or more colors are dispersed so as to avoid noticeable clumping of dots of two or more colors to provide a more uniform pattern and to avoid the unintentional overlapping of colors. This technique can be used to augment any existing error diffusion method.

Abstract: Tone dependent plane dependent error diffusion halftoning takes into account multiple color planes, such as cyan and magenta, when determining the placement of a dot in any of the color planes. The combined tones of the correlated color planes is used to determine the threshold levels against which the combined tones and the accumulated errors for the correlated color planes is compared. Further, tone dependent error weightings are determined based on the combined tones of the correlated color planes. The tone dependent error weightings are used to diffuse the final accumulated errors for each color plane. A prerendered mid-tone bitmap may be used to break up any structured patterns that occur in the mid-tones. Using this technique, printed dots of two or more colors are dispersed so as to avoid noticeable clumping of dots of two or more colors to provide a more uniform pattern and to avoid the unintentional overlapping of colors. This technique can be used to augment any existing error diffusion method.