EP0599495A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for adjusting correlated color temperature
Assignee: Canon Information Systems Inc
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Filing: 1993-10-29
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Granted: —
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Expires: 2013-10-29
Abstract
Abstract A color printing system includes a central processing unit for generating color image data, a color monitor for displaying color image data generated by the central processing unit and a color temperature sensing device for sensing color temperature of viewing light in which color images displayed on the monitor and color images printed by the printer are viewed. A first light source has a light output intensity controllable by the central processing unit. The central processing unit is adapted to control the intensity of the first light source in accordance with the color temperature sensed by the sensing device so as to match the color temperature sensed by the sensing device to a potential color temperature. Additionally, a second light source may be provided. The second light source has a different color temperature than the first light source and the central processor can adjust the intensity of the first and second light source based on relative color temperatures. The central processing unit is adapted to adjust the color temperature of either or both intensity of the first and second light sources.
Inventors
- 👤 Giordano Bruno Beretta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:06
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6083; H04N1/6088; H04N1/6011; H04N1/603; H04N1/6052
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
53 words
A method for color printer comprising the steps of: reading the color temperature of viewing light in a first location from a second location; equalizing color output signals based on the color temperature read in said reading step; and printing a color image in the first location based on the equalized color data.
Claim 2
Dependent Claim
31 words
A method according to Claim 1, wherein said reading step comprises the step of addressing a request for color temperature to an addressable color temperature sensor connected to a digital interface.
Claim 3
Dependent Claim
24 words
A method according to Claim 1, further comprising the step of viewing the color image printed in said printing step in the first location.
Claim 4
Independent Claim
69 words
A method of matching the color temperature of viewing light and the color temperature of a color monitor comprising the steps of: reading the color temperature of the viewing light; comparing the color temperature of the viewing light to the color temperature of the monitor; and matching the color temperature of the viewing light to the color temperature of the monitor based on the results of said comparison step.
Claim 5
Dependent Claim
20 words
A method according to Claim 4, further comprising an adjustment step for adjusting the white point of said color monitor.
Claim 6
Dependent Claim
74 words
A method according to Claim 5, wherein said adjusting step comprises the step of decreasing the color temperature of the viewing light in the case where the color temperature of the viewing light is higher than the color temperature of the monitor and the step of increasing the color temperature of the viewing light in the case where the color temperature of the viewing light is lower than the color temperature of the monitor.
Claim 7
Dependent Claim
65 words
A method according to Claim 5, wherein the white point of the monitor is increased in the case where the color temperature of the monitor is lower than the color temperature of the viewing light and wherein the white point of the monitor is decreased in the case where the color temperature of the monitor is greater than the color temperature of the viewing light.
Claim 8
Dependent Claim
37 words
A method according to Claim 7, wherein said step of decreasing the color temperature of the viewing light comprises the step of decreasing the intensity of an incandescent source and/or increasing the intensity of a fluorescent source.
Claim 9
Dependent Claim
37 words
A method according to Claim 7, wherein said step of increasing the color temperature of the viewing light comprises the step of increasing the intensity of an incandescent source and/or decreasing the intensity of a fluorescent source.
Claim 10
Dependent Claim
20 words
A method according to Claim 4, wherein in said matching step, the color temperature of the viewing light is adjusted.
Claim 11
Dependent Claim
31 words
A method according to Claim 4, wherein said matching step includes the step of adjusting both the white point of the color monitor and the color temperature of the viewing light.
Claim 12
Dependent Claim
72 words
Apparatus for adjusting color temperature of viewing light to a predetermined color temperature comprising: a first adjustable intensity light source; means for measuring the color temperature of viewing light, the viewing light including ambient light and the light output of said first light source; means for comparing the color temperature measured by said measuring means with the predetermined color temperature; and means for adjusting said first light source based on the comparison.
Claim 13
Dependent Claim
31 words
Apparatus according to Claim 12, further comprising a second adjustable intensity light source, said second light source having a color temperature different from the color temperature of said first light source.
Claim 14
Dependent Claim
24 words
Apparatus according to Claim 13, wherein said adjusting means adjusts said first light source and said second light source based on relative color temperature.
Claim 15
Dependent Claim
73 words
Apparatus according to Claim 13, wherein the color temperature of said second light source is higher than the color temperature of said first light source, and wherein said adjusting means is adapted to increase the intensity of said second light source when the color temperature measured by said measuring means is low and to increase the intensity of said first light source when the color temperature measured by said measuring means is high.
Claim 16
Dependent Claim
21 words
Apparatus according to Claim 12, wherein said first adjustable intensity light source includes a controllable dimmer controllable by said adjusting means.
Claim 17
Dependent Claim
14 words
Apparatus according to Claim 12, further comprising means for setting the pre-designated color temperature.
Claim 18
Dependent Claim
36 words
Apparatus according to Claim 17, wherein said means for setting includes means for measuring the color temperature of a color monitor and wherein said pre-designated temperature is set to the color temperature of said color monitor.
Claim 19
Dependent Claim
130 words
A color printing system comprising: a central processing unit for generating color image data; a color monitor for displaying color image data generated by said central processing unit; a color printer for printing color image data generated by said central processing unit; a color temperature sensing device for sensing color temperature of viewing light in which color images displayed on said monitor and color images printed by said printer are viewed; a first light source having a light output intensity controllable by said central processing unit; wherein said central processing unit is adapted to control the intensity of said first light source in accordance with the color temperature sensed by said sensing device so as to match the color temperature sensed by said sensing device to a predetermined color temperature.
Claim 20
Dependent Claim
65 words
A color printing system according to Claim 19, further comprising a second color sensing device for sensing the color temperature of said color monitor, wherein said central processing unit is adapted to set the predetermined color temperature to the color temperature sensed by said second color sensing device whereby color temperature of the viewing light is matched to the color temperature of the color monitor.
Claim 21
Dependent Claim
34 words
A color printing system according to Claim 19, further comprising a second adjustable intensity light source, said second light source having a color temperature different from the color temperature of said first light source.
Claim 22
Dependent Claim
31 words
A color printing system according to Claim 21, wherein said central processing unit is adapted to adjust said first light source and said second light source based on relative color temperature.
Claim 23
Dependent Claim
81 words
A color printing system according to Claim 21, wherein the color temperature of said second light source is higher than the color temperature of said first light source, and wherein said central processing unit is adapted to increase the intensity of said second light source when the color temperature measured by said color temperature sensing device is low and to increase the intensity of said first light source when the color temperature measured by said color temperature sensing device is high.
Claim 24
Dependent Claim
52 words
A color printing system according to Claim 19, wherein said central processing unit is adapted to control both the intensity of said first light source and said color monitor in accordance with the color temperature sensed by said sensing device so as to adjust the color temperature to a predetermined color temperature.
Claim 25
Dependent Claim
51 words
A color printing system according to Claim 19, further comprising a color sensing device for sensing the color temperature of said color monitor wherein said central processing unit is adapted to adjust an output color image of the color printer so as to match the color temperature of the color monitor.
Claim 26
Dependent Claim
25 words
A color printing system according to Claim 19, wherein said first adjustable intensity light source includes a controllable dimmer controllable by the central processing unit.
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