Image processing apparatus and method

• US 8,027,058 B2
• Filed: 04/06/2007
• Issued: 09/27/2011
• Est. Priority Date: 04/12/2006
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Jinno, Takayuki
• Primary Examiner(s): Williams; Kimberly A
• Application Number:
  US11/697,343
• Publication Number:
  US 20070243314A1
• Time in Patent Office: 1,635 Days
• Field of Search: 358/1.9, 358/2.1, 358/3.02, 358/3.06, 358/3.09, 358/3.26, 358/1.13, 358/1.14, 358/1.15, 358/1.18, 347/1, 347/3, 347/5, 347/14, 347/15, 347/19, 347/43, 347/101
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6022 Generating a fourth subtractive colour signal, e.g. under colour removal, black masking
• CPC Class Codes: H04N 1/6097 depending on the characteristics of the output medium, e.g. glossy paper, matt paper, transparency or fabrics

Abstract

A color region in which the difference of a bronzing between different colors is to be decreased is set in accordance with preset printing conditions, and a bronzing of a printing medium with a predetermined chromaticity is measured. The measured bronzing measurement value is held, and color separation data to decrease the difference of the measurement value between the different colors in the color region is generated based on the held bronzing measurement value.

Claims

1. A color processing method of determining color separation data corresponding to color materials used in a printing apparatus, comprising:

using a processor to perform the steps of;

an inputting step of inputting, for each of a plurality of representative colors, a plurality of color separation data, each of the plurality of color separation data being capable of reproducing the representative color having a different bronzing tint; and

a determining step of determining, for each of the plurality of representative colors, a color separation data among the plurality of color separation data being capable of reproducing the representative color so as to decrease a difference between the bronzing tints among the plurality of representative colors.

2. The method according to claim 1, wherein said bronzing tint is obtained by measuring a tint of specular reflected light from an image printed on a printing medium by use of the color separation data which is capable of reproducing the representative color.

3. The method according to claim 1, further comprising:

an obtaining step of obtaining characteristic data of an image printed under a printing condition acceptable by the printing apparatus; and

a setting step of setting, based on the characteristic data, a color region which includes at least a part of the plurality of representative colors,

wherein the inputting step inputs, for each of the plurality of representative colors included in the color region, the plurality of color separation data, each of which is capable of reproducing the representative color having the different bronzing tint.

4. The method according to claim 3, wherein said characteristic data is a type of the image.

5. The method according to claim 3, wherein said characteristic data is a histogram of the image.

6. The method according to claim 3, wherein said printing condition includes a type of a printing medium and a type of color materials used for printing.

7. The method according to claim 3, wherein said printing condition includes a printing mode.

8. The method according to claim 3, further comprising:

a displaying step of displaying a user interface for use in designating the printing condition,

wherein the obtaining unit obtains the printing condition through the user interface.

10. A non-transitory computer readable medium storing a computer program that causes a computer to execute the color processing method according to claim 1.

9. A color processing apparatus for determining color separation data corresponding to color materials used in a printing apparatus, comprising:

an inputting unit that inputs, for each of a plurality of representative colors, a plurality of color separation data, each of the plurality of color separation data being capable of reproducing the representative color having a different bronzing tint; and

a determining unit that determines, for each of the plurality of representative colors, a color separation data among the plurality of color separation data being capable of reproducing the representative color so as to decrease a difference between the bronzing tints among the plurality of representative colors.