Facsimile and static presentation processing – Natural color facsimile – Color correction
Reexamination Certificate
1996-07-17
2001-03-06
Grant, II, Jerome (Department: 2724)
Facsimile and static presentation processing
Natural color facsimile
Color correction
C358S519000, C358S527000
Reexamination Certificate
active
06198553
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image processing apparatus and method for performing a color adjustment process for an image before it is printed.
2. Related Background Art
High image quality and sophisticated functions of digital color copiers are becoming more common. A color adjustment process and an editing process for an output image now meet most of requirements of users. Copiers having a so-called preview function are also being manufactured. With this preview function, instead of printing an image several times on recording sheets in order to obtain a desired image, an image is displayed on a CRT or the like.
There are copiers having a monochrome liquid crystal display for displaying and confirming a read original image. For a color copier, however, a preview system of full-color is desired in order to adjust colors.
One example of a preview system is shown in FIG.
42
. Blocks
101
to
109
constitute a full-color copier, and blocks
110
to
111
, and
219
constitute a preview system.
In
FIG. 42
, reference numeral
101
represents an RGB output sensor for reading a reflection original, reference numeral
102
represents an S/H and A/D converter, reference numeral
103
represents a shading correction circuit, reference numeral
104
represents an input masking circuit, reference numeral
105
represents a LOG converter circuit, reference numeral
106
represents a masking UCR for adjusting the colors to match the printer characteristics, reference numeral
107
represents an image editing circuit for performing various processes such as trimming, masking, painting, and a variable power process, reference numeral
108
represents an edge emphasis circuit, and reference numeral
109
represents a printer unit for scanning a reflection original three or four times to print a full-color image.
Reference numeral
110
represents an image memory unit for storing image signals (RGB) after input masking, reference numeral
111
represents a memory control circuit for controlling the image memory
110
(the memory control circuit having an address counter and controlling data transfer between an unrepresented CPU and image memory), and reference numeral
219
represents a CRT for displaying data in the image memory. If a read image is simply displayed on a CRT, a desired editing process entered from an operation unit is not reflected in the image.
There may sometimes be a hue difference between the printed image of a digital color copier and the preview image.
SUMMARY OF THE INVENTION
The invention has been made under the above circumstances and aims at matching hues of an output image and a preview image.
The invention also aims at matching hues of an output image and a preview image irrespective of the display characteristics of a display device and the observation conditions.
According to one aspect of the present invention, there is provided an image processing apparatus for generating preview image data to confirm on a display, an output color image generated by an image forming apparatus, comprising: input means for inputting from the image forming apparatus density data representative of the output color image, the density data depending on the output characteristics of the image forming apparatus; conversion means for converting the input density data into luminance data on a predetermined color space; and color correction means for correcting color of the luminance data in accordance with the display characteristics and observation conditions of the display, and generating the preview image data being dependent on the display.
The invention also aims at readily making a white color temperature of a display device and an ambient light color temperature equal to each other.
According to another aspect of the present invention, there is provided an image processing apparatus comprising: measurement means for measuring a first color temperature of a white color of a display and a second color temperature of ambient light; and conversion means for converting an input image signal into an image signal for the display in accordance with the measurement results of the measurement means, wherein the conversion means performs an image signal conversion so as to match the first color temperature with the second color temperature.
The above and other objects of the invention will become apparent from the following detailed description and the claims when read in connection with the accompanying drawings.
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Kitamura Toshiyuki
Kurita Mitsuru
Suzuki Yasumichi
Yamamoto Nobuo
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Grant II Jerome
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