EP0508121A2
Expired / Lapsed
EP
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Color image forming apparatus having mono-color image forming function
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1992-03-09
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Granted: —
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Expires: 2012-03-09
Abstract
Abstract A color image forming apparatus having a function of forming a mono-color image based on a full-color image data inputted includes: highest-value image data outputting circuit (50) for comparing the values of color image data of three primary colors constituting the full-color image data to output a color image data having a highest value thereamong; and mono-color image forming portion for forming a predetermined mono-color image based on the output of the highest-value image data outputting circuit.
Inventors
- 👤 Katsumi Amakawa
- 👤 Haruo Yamamoto
- 👤 Shuji Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 13:58
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A color image forming apparatus having a function of forming a mono-color image based on a full-color image data inputted, comprising: highest-value image data outputting means (50) for comparing the values of color image data of three primary colors (YD, MD, CD) constituting said full-color image data to output a color image data having a highest value thereamong; and mono-color image forming means (8, 9, 11-15) for forming a predetermined mono-color image based on the output of said highest-value image data outputting means (50).
Claim 2
Dependent Claim
66 words
A color image forming apparatus according to claim 1, wherein said mono-color image forming means comprises: a color specifying operation member for specifying a mono color to be used for forming a mono-color image; a plurality of developer units (17) having toner of different colors, respectively; and controlling means for activating the developer unit having toner of the color specified by said color specifying operation member.
Claim 3
Dependent Claim
114 words
A color image forming apparatus having a function of forming a mono-color image based on a full-color image data inputted, comprising: image reading-in means (3-7) for reading-in an original image in the form of electric signals corresponding to red, green and blue which are the three primary colors of light; highest-value image data outputting means (50) for comparing the values of color image data of the three colors outputted by said image reading-in means (3-7) to output a color image data having a highest value thereamong; and mono-color image forming means (8, 9, 11 - 15) for forming a predetermined mono-color image based on the output of said highest-value image data outputting means (50).
Claim 4
Dependent Claim
39 words
A color image forming apparatus according to claim 1 or 3, wherein said highest-value image data outputting means (50) performs said comparison for every dot of image and outputs said highest-value color image data for every dot of image.
Claim 5
Dependent Claim
21 words
A color image forming apparatus according to claim 1 or 3, wherein said three primary colors are yellow, magenta and cyan.
Claim 6
Dependent Claim
85 words
A color image forming apparatus according to claim 1 or 3, wherein said highest-value image data outputting means (50) comprises: a first comparator (28) for comparing the values of the color image data of two of the three primary colors; and a second comparator (31) for comparing the value of the color image data which is determined to have a higher value by said first comparator (28) and the value of the color image data of the primary color other than said two primary colors.
Claim 7
Dependent Claim
92 words
A color image forming apparatus according to claim 6, wherein said highest-value image data outputting means (50) further comprises: first gate means (29, 30) for outputting one of the color, image data of said two primary colors based on the output of said first comparator (28); and second gate means (32, 33) for outputting one of the color image data output of said first gate means (29, 30) and the color image data of the primary color other than said two primary colors based on the output of said second comparator (31).
Claim 8
Dependent Claim
61 words
A color image forming apparatus according to claim 3, wherein said mono-color image forming means comprises: a color specifying operation member for specifying a mono color to be formed; a plurality of developer units (17) having toner of different colors, respectively; and controlling means for activating the developer unit having toner of the color specified by said color specifying operation member.
References Cited (Backward Citations)
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