APPARATUS FOR PRODUCTION OF COLOR SEPARATION RECORDS

• US 3,555,262 A
• Filed: 05/07/1968
• Issued: 01/12/1971
• Est. Priority Date: 05/07/1968
• Status: Expired due to Term

• Current Assignee: Shimada Shoichi
• Original Assignee: Shimada Shoichi
• Inventors: SHIMADA SHOICHI
• Application Number:
  US04/727,191
• Time in Patent Office: 980 Days
• US Class Current: 358/529
• CPC Class Codes: G06G 7/75 for component analysis, e.g. of mixtures, of colours G06G7/122 takes precedence ; gas chromatography G01N30/00
• CPC Class Codes: H04N 1/54 Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing

Abstract

Color separation records are produced which are necessary to produce printers for printing color images by scanning an original copy. More particularly, printers are produced for reproducing color images with the use of color inks other than the standard inks. Black ink is used for the separation of color to substitute for the neutral color which is normally obtained by printing the standard three color inks one over the other.

Claims

1. Apparatus for the production of color-separation records for the reproduction of color images from a scanned original color copy comprising input terminals for supplying signals individually representative of the primary red, green, and blue color components of a scanned color copy, a basic computation circuit means coupled to said input terminals for deriving ink signals corresponding to a set of basic three primary color inks, three secondary color inks and a black ink individually representative of said set of color components and the neutral component of said scanned color copy, a special color computation circuit means having a plurality of circuit means individually coupled to the output terminals of said basic computation circuit means, each effective to correct said ink signals from said basic computation circuit means in accordance with the hue of the primary color inks and the intermediate color inks which are actually used for reproduction, and an under-color removal circuit means coupled to said special color computation circuit means for adjustably developing signals representative of the amount to be removed of the islands or dots in the color separation records of the basic three primary colors corresponding to the amounts of the signals for the intermediate colors and neutral gray derived from said special Color computation circuit means.

2. Apparatus for the production of color separation records for the reproduction of color images from a scanned original color copy as claimed in claim 1, wherein the basic computation circuit means comprising a color correction circuit which develops ink signals corresponding to the standard inks for four-color halftone representative of yellow, magenta, cyan and black and a plurality of color computers individually deriving ink signals on the supposition that the color images of a scanned color copy are reproduced with the use of basic three primary color inks of yellow, magenta and cyan, basic three intermediate color inks of orange, violet and green and black ink additively.

3. Apparatus for the production of color separation records for the reproduction of color images from a scanned original color copy as claimed in claim 2, wherein the basic computation circuit means are provided with a plurality of color computers each having the differential amplifier for deriving the signals in the equations:

4. Apparatus for the production of color separation records for the reproduction of color images from a scanned original color copy as claimed in claim 1, wherein the special color computation circuit means comprising a plurality of color computer units each having a set of potentiometers and a differential amplifier for deriving the signals in the equations:

5. Apparatus for the production of color separation records for the reproduction of color images from a scanned original color copy as claimed in claim 1, wherein the under-color circuit means are provided with a plurality of amplifiers each effective to develop the signals in the equations: