CONTROL DEVICE, IMAGE PROCESSING METHOD AND IMAGE PROCESSING PROGRAM

• Main Author: HIRANO SACHIKO
• Format: Patent
• Language: English; Japanese
• Published: 15.03.2018
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

PROBLEM TO BE SOLVED: To improve color reproducibility even in a case where an input image has high saturation or high lightness.SOLUTION: When performing printing in which a white ground is imparted to a color input image, multi-value pixels of the input image and the white ground are generated and it is discriminated whether a color of the multi-level pixel of the input image is a predetermined color. Both a pixel value of each of color material colors of the input image and a pixel value of a white color of the ground are subtracted in such a manner that a total value of both the pixel values becomes equal to or less than a predetermined value. After a color material amount during the printing is limited, the pixels are transformed into a binary pixel array for each color material color using the area gradation method. Based on the binary pixel array that is obtained by transforming the multi-value pixels of the predetermined color, a pixel position at which any one of C, M and Y color components is present and a pixel position at which no color component is present are identified. At least one white pixel disposed at any one pixel position is rearranged at the other pixel position where a white pixel is not disposed, with respect to the white binary pixel array, and a result of the rearrangement is outputted.SELECTED DRAWING: Figure 6 【課題】入力画像が高彩度及び高明度のいずれの場合でも、色再現性を高める。【解決手段】カラーの入力画像に白色の下地を付与した印刷を行う際に、入力画像及び白色の下地の多値の画素を生成し、入力画像の多値の画素の色が所定の色であるかを判定し、入力画像の各色材色の画素値と下地の白色の画素値との合計値が所定値以下となるように双方の画素値を減じて、印刷時の色材量を制限した後、面積階調方法を用いて色材色毎の２値の画素配列に変換し、上記所定の色の多値の画素を変換して得た２値の画素配列に基づいて、C、M、Yのいずれかのカラー成分がある画素位置及びカラー成分がない画素位置を特定し、白色の２値の画素配列に対して、いずれか一方の画素位置に配置されている少なくとも１つの白色の画素を、白色の画素が配置されていない他方の画素位置に再配置し、再配置した結果を出力する。【選択図】図６