Color reproduction system
Image synthesizing system
Image combining in image processing apparatus
Color printer calibration with blended look up tables
Method and apparatus for printing high fidelity color reproductions of colors displayed on a monitor
Halftone computer imager
Reduced storage of pre-computed difference tables used in color space conversion Patent #: 5592591
ApplicationNo. 608867 filed on 02/29/1996
US Classes:358/1.9, Attribute control358/1.15, Communication358/1.2, Size, resolution, or scale control358/462, Text and image detection and processing358/515, Color separation358/518, Color correction358/520Hue, saturation and luminance
ExaminersPrimary: Coles, Sr., Edward L.
Assistant: Wallerson, Mark
Attorney, Agent or Firm
International ClassesG06F 015/00
AbstractA method and apparatus for blending pictorial and graphical look-up tables is provided. The blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.