Expanded color space
AssigneeHewlett-Packard Development Company, L.P.
InventorJeffrey Steinhauer
Life of this patent
Estimating the term…
Abstract
A process for color printing an image with angled half tone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant having a hue angle intermediate the hue angles of Cyan and Magenta.
Claims27
A process for color printing an image with angled half tone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant comprising:
- choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta;
- assigning a screen angle to each of the colorants in the colorant set:
- providing an angled half tone screen for each of the colorants of the colorant set responsive to a color separation of the image;
- and
- using the angled half tone screens to produce a color printing of the Image,
- wherein the number of colorants in the colorant set is odd and assigning a screen angle to each of the colorants of the colorant set comprises assigning black a first screen angle, assigning one half of said non-black colorants a second screen angle and one half of said non-black colorants a third screen angle, wherein said first, second and third screen angles are different and wherein non-black colorants having adjacent hue angles are assigned different screen angles.
A process for color printing an image with angled half tone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant comprising:
- choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta;
- assigning a screen angle to each of the colorants in the colorant set;
- providing an angled half tone screen for each of the colorants of the colorant set responsive to a color separation of the image;
- and
- using the angled halftone screens to produce a color printing of the image,
- wherein the number of colorants in the colorant set is even and assigning a screen angle to each of the colorants of the colorant set comprises assigning black a first screen angle, assigning one half of said colorants that are neither black or yellow a second screen angle and one half of said colorants that are neither black or yellow a third screen angle, wherein yellow is assigned a fourth screen angle, wherein said first, second, third and fourth screen angles are different and wherein non-black colorants having adjacent hue angles are assigned different screen angles.
A process according to any of the previous claims wherein choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hues angles of Cyan and Magenta comprises choosing a colorant substantially exterior to the gamut of hues provided by said Cyan, Magenta, Yellow and Black colorants.
A colorant set for color printing with angled half tone screens comprising:
- at least five colorants including Cyan, Magenta, Yellow and Black colorants;
- and at least one colorant have a hue angle intermediate the hue angles of Cyan and Magenta,
- wherein the number of the at least five colorants is odd wherein said black colorant has a first screen angle, wherein one half of said non-black colorants have a second screen angle and one half of said non-black colorants have a third screen angle, wherein said first, second and third screen angles are different and wherein non-black colorants having adjacent hue angles have different screen angles.
A colorant set for color printing with angled halftone screens comprising;
- at least five colorants including Cyan, Magenta, Yellow and Black colorants;
- and at least one colorant have a hue angle intermediate the hue angles of Cyan and Magenta,
- wherein the number of the at least five colorants is even, wherein said black colorant has a first screen angle, wherein one half of said colorants that are neither black or yellow have a second screen angle and one half of said colorants that are neither black or yellow have a third screen angle, wherein yellow has a fourth screen angle, wherein said first, second, third and fourth screen angles are different and wherein non-black colorants having adjacent hue angles have different screen angles.
A process for color printing an image with angled halftone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant comprising:
- choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta;
- assigning a screen angle to each of the colorants in the colorant set;
- providing an angled half tone screen for each of the colorants of the colorant set responsive to a color separation of the image;
- and
- using the angled half tone screens to produce a color printing of the Image,
- wherein choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hues angles of Cyan and Magenta comprises choosing a colorant substantially exterior to the gamut of hues provided by said Cyan, Magenta, Yellow and Black colorants.
A process for color printing an image with angled half tone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant comprising:
- choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta;
- assigning a screen angle to each of the colorants in the colorant set;
- providing an angled half tone screen for each of the colorants of the colorant set responsive to a color separation of the image;
- and
- using the angled halftone screens to produce a color printing of the image,
- wherein choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta comprises choosing violet.
A colorant set for color printing with angled half tone screens comprising:
- at least five colorants including Cyan, Magenta, Yellow and Black colorants;
- and
- at least one colorant have a hue angle intermediate the hue angles of Cyan and Magenta,
- wherein the at least one colorant having a hue angle intermediate the hue angles of Cyan and Magenta is a colorant substantially exterior to the gamut of hues provided by said Cyan, Magenta, Yellow and Black colorants.
A process for color printing an image with angled halftone screens and a colorant set that includes Cyan, Magenta, Yellow and Black colorants and at least one other colorant comprising:
- choosing the at least one other colorant so that one of the at least one other colorant is a colorant having a hue angle intermediate the hue angles of Cyan and Magenta;
- assigning a screen angle to each of the colorants in the colorant set;
- providing an angled half tone screen for each of the colorants of the colorant set responsive to a color separation of the image;
- and
- using the angled halftone screens to produce a color printing of the image,
- wherein cyan and magenta have a same screen angle.
Dependencies are inferred from the claim text.