Abstract: A method of forming a halftone screen, the method comprising: representing a first tone range by forming a plurality of dots arranged in a grid; representing a second tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots contained within respective dot cells and having four arms, a distal end of at least one of the arms wider than a proximal end, the second tone range darker than the first tone range; and representing a third tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots contained within respective dot cells and having four arms, a proximal end of at least one of the arms wider than the proximal end of at least one arm of the cross-shaped dots representing the second tone range, the third tone range darker than the second tone range.

Abstract: A method of forming a halftone screen comprising representing each of a first, second, third and fourth tone range of increasing darkness by forming a plurality of dots arranged in a grid; the dots representing the second tone range larger than the dots representing the first tone range; the dots representing the third tone range having a body section and at least one extension extending toward a or respective nearest neighbor(s), the extension(s) narrower in width than the body section, the dots representing the third tone range substantially the same size as the dots representing the second tone range; and the dots representing the fourth tone range having a body section and at least one extension extending toward a or respective nearest neighbor(s), the extension(s) greater in width than the extension(s) associated with the dots representing the third tone range. A halftone screen and a printing system are also disclosed.

Abstract: A method of forming a halftone screen, the method comprising: representing a first tone range by forming a plurality of dots arranged in a grid; representing a second tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots contained within respective dot cells and having four arms, a distal end of at least one of the arms wider than a proximal end, the second tone range darker than the first tone range; and representing a third tone range by forming a plurality of substantially cross-shaped dots arranged in a grid, the cross-shaped dots contained within respective dot cells and having four arms, a proximal end of at least one of the arms wider than the proximal end of at least one arm of the cross-shaped dots representing the second tone range, the third tone range darker than the second tone range.

Abstract: A method of forming a halftone screen comprising representing each of a first, second, third and fourth tone range of increasing darkness by forming a plurality of dots arranged in a grid; the dots representing the second tone range larger than the dots representing the first tone range; the dots representing the third tone range having a body section and at least one extension extending toward a or respective nearest neighbour(s), the extension(s) narrower in width than the body section, the dots representing the third tone range substantially the same size as the dots representing the second tone range; and the dots representing the fourth tone range having a body section and at least one extension extending toward a or respective nearest neighbour(s), the extension(s) greater in width than the extension(s) associated with the dots representing the third tone range. A halftone screen and a printing system are also disclosed.

Abstract: The patterns can be used to reduce one or more undesirable effects such as moire or colour shift in coloured halftone images. Colour screens in the images are based on a combination of non-orthogonal mesh structures with parcels of printing dots which have common shape and size. Preferably the dots grow in mid tones by extending first towards their second, third or fourth nearest neighbours.

Abstract: The dot patterns can be used to reduce dot gain and moire effects in halftone images involve printing areas that have inwardly curved edges and variable elongation. Colored images having screens that use these patterns can be printed with the screens at 45.degree. relative angular separations. Alternatively the dot patterns can be regarded as reversed variable oval patterns with varying elongation of the generally oval shaped non-printing areas.

Abstract: The dot patterns which may be used to reduce dot gain and moire effects in halftone images involve printing areas which have inwardly curved edges and variable elongation. Colored images having screens which use these patterns may be printed with the screens at 45.degree. relative angular separations. Alternatively the dot patterns may be regarded as reversed variable oval patterns with varying elongation of the generally oval shaped non-printing areas.

Abstract: The patterns can be used to reduce one or more undesirable effects such as moire or colour shift in coloured halftone images. Colour screens in the images are based on a combination of non-orthogonal mesh structures with parcels of printing dots which have common shape and size. Preferably the dots grow in mid tones by extending first towards their second, third or fourth nearest neighbours.