Title:
【発明の名称】減少されたメモリー条件を有するカラー画像のための高品質マルチレベルハーフトーン化法
Document Type and Number:
Japanese Patent JPH08512444
Kind Code:
A
Abstract:
PCT No. PCT/EP94/02291 Sec. 371 Date Jan. 10, 1996 Sec. 102(e) Date Jan. 10, 1996 PCT Filed Jul. 7, 1994 PCT Pub. No. WO95/02938 PCT Pub. Date Jan. 26, 1995A method is disclosed for producing a colour image by printing on a sheet a plurality of monochrome images on top of each other. The monochrome image (37) is composed of microdots (36), having an address (x,y). Each microdot (36) is represented by a pixel (32). The pixel (32) carries information about the address (x,y) and an image signal Ix,y that corresponds with the density to be printed on the microdot (36). This image signal is given as 8 bit signal data for example. The microdots (36) are partitioned by a screen (40) in identical screen cells (33), composed of M microdots (36). Each microdot is associated with a pixeltonecurve (34). The image signal Ix,y is transformed to a bitmap signal B by the pixeltonecurve (34). The image signal Ix,y is transformed to a bitmap signal B by the pixeltonecurve (34) corresponding to the microdot (36). The bitmap signal B is represented by 2 or 4 bit resulting in important memory savings for the bitmap signals. The bitmap signal B is further transformed to a printer signal. The printer signal is transformed by printing to a density on the microdot (36) with address (x,y).
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Inventors:
Elegod, Marc
Betin, Roger
Nope, Jere
Betin, Roger
Nope, Jere
Application Number:
JP50434195A
Publication Date:
December 24, 1996
Filing Date:
July 07, 1994
Export Citation:
Assignee:
Agfa-Gewert Nam Roze Bennaught Chap
International Classes:
B41J2/44; B41J2/525; B41J5/30; G03G15/01; G06T5/00; H04N1/40; H04N1/405; H04N1/41; H04N1/50; B41J2/21; H04N1/52; (IPC1-7): H04N1/405; B41J2/21; B41J2/44; B41J2/525; B41J5/30; G03G15/01; G06T5/00; H04N1/41
Attorney, Agent or Firm:
Mitsuo Adachi (2 outside)