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System and method for digital rendering of images and printed articulation

  • US 5,347,620 A
  • Filed: 08/14/1992
  • Issued: 09/13/1994
  • Est. Priority Date: 09/05/1991
  • Status: Expired due to Term
First Claim
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1. A method for a placement of a donor color onto a receptor color, said donor and receptor colors being represented in a red-green-blue format, for producing marks, washes, strokes, colorations or effects similar to those produced with natural dyes, wherein said placement is produced in a two-dimensional image field on a computer, said image field comprising picture elements that can individually be used as said receptor colors, said method comprising the steps of:

  • modifying red, green, and blue receptor picture element components into cyan, magenta, and yellow density components comprising a three-element absorption spectrum,converting red, green, and blue donor picture element components into cyan, magenta, comprising a three-element absorption spectrum,scaling cyan, magenta, and yellow donor density components by a penetration fraction, said scaling corresponding to control over the amount of said donor color deposited,adding said donor density components into a receptor density component,transforming said cyan, magenta, and yellow receptor density components to red, green, and blue updated receptor transmittances, anddepositing said updated red, green, and blue transmittances into said two-dimensional image field.

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