JPH06230759A - Display device making full color data into a small number of colors - Google Patents

Abstract

PURPOSE:To prevent the display image of each color data from being different from an original picture color image and to display desired image data in a color image nearer to that of an original picture even when plural pieces of color image data are supplied as data to be displayed in a display device making full color data into a small number of colors. CONSTITUTION:When the image data adaptable for full color is read in by a scanner 17 and is supplied as the data to be displayed, it is selected whether data 21 of reference N colors stored in main memory 13 in advance by allocating 16770000 full colors uniformly to displayable 256 colors or data of dedicated N kinds of colors stored in a magnetic disk 14 by selecting 256 colors dedicated for individual color data, respectively is used by the operation of a mouse 18, and the data to be displayed is correlated to the reference N kinds of colors or the dedicated N kinds of colors corresponding to a selection result, and conversion making into small colors is performed by a CPU 11, then, it is displayed on a display 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-color data reduction display device for reducing full-color image data and displaying it.

[0002]

2. Description of the Related Art Generally, computer displays are
16 primary colors of R, G and B expressed in 8 bits
Of the 770,000 full colors, 256 colors are selected for display.

That is, when a color photograph, for example, is given as an image to be displayed on a computer display, the color photograph is optically read by an image scanner and stored in an image memory such as a RAM as digital data corresponding to the full color. Is stored.

Then, the full-color-compatible digital image data stored in the image memory is converted into a reduced color and displayed according to a preset color reduction algorithm of 256 colors according to various computer displays. Usually, the 256 colors that can be displayed on the computer display are set by selecting a color such that the image of the original image is moderately maintained no matter what color image data is given.

[0005]

If the above-mentioned 256 colors are selected so that a plurality of full-color image data can be displayed as close to the original color image as possible, the 256-color image data corresponding to each image data will be displayed. Due to the different combinations, they cannot be displayed simultaneously on one computer display.

In this case, conventionally, other image data is converted into a smaller color and simultaneously displayed in accordance with 256 colors selected according to any one of the image data, but the color of the other image data is displayed. The image is displayed in a completely different state from the original picture.

Therefore, when the above-mentioned plurality of image data are given, if 256 colors are selected for all the colors existing in these image data, it is possible to display each image at the same time with a reasonable color image. Yes, but there is one
Regarding one image data, the color image for the original image is significantly deteriorated as compared with the case where 256 colors are selected according to the image data. On the other hand, full color (167
A computer display capable of displaying all 70,000 colors) at the same time has also been developed, but there is a problem that it is very expensive and not practical.

The present invention has been made in view of the above problems.
Even if multiple color image data are given as the data to be displayed, the display image of each image data does not differ from the original color image at all, and the color image closer to the original image for the desired image data. It is an object of the present invention to provide a full color data color reduction display device capable of displaying with.

[0009]

That is, a full-color data reduced color display device according to the present invention has three primary colors (R,
Each of G and B) is displayed by converting the full color of 2 ^3m color expressed by m bits into N colors (<2 ^3m ) with reduced color, and the 2 ^3m color is evenly allocated to N colors. Standard N color data, dedicated N color data selected exclusively for each of a plurality of full color compatible image data, and each image element in the full color compatible image data are associated with the standard N color data to reduce the number. Standard color-reducing means for color-converting, dedicated color-reducing means for color-converting each image element in full-color-compatible image data in association with the dedicated N-color data, and full-color-compatible image data When given as display data, display color selection means for selecting whether to display using the standard N color data or the dedicated N color data, and, according to the selection result by the selection means, Displayed image data Color reduction control means for converting the data into the standard N color data or the dedicated N color data in association with the standard N color data or the dedicated N color data, and the color reduction control means. And display means for displaying the converted display data.

[0010]

In other words, if the standard N color data is selected and displayed in a reduced number of colors for a plurality of full color image data, all of them are simultaneously displayed in a state in which they match the original color image to some extent. If the dedicated N color data is selected and displayed in a reduced number of colors, a color image closer to the original image can be displayed for arbitrary image data.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a computer display equipped with a full color data color reduction display device.

The computer display is a CPU
A (central processing unit) 11 is provided, and a main memory 13, a magnetic disk 14, a keyboard 15, a display 16, an image scanner 17, and a mouse 18 are connected to the CPU 11 via a system bus 12.

The CPU 11 controls the operation of each part of the apparatus according to programs and data stored in the main memory 13 and the magnetic disk 14 based on user operation signals from the keyboard 15, the image scanner 17, and the mouse 18.

FIG. 2 is a diagram showing the contents of various data stored in the main memory 13 and the magnetic disk 14 in a computer display equipped with the full color data color reduction display device.

That is, in the main memory 13, for example, in addition to various system control programs and color data display programs, an N color reduction program 21, standard N color data 22, and standard N color reduction table 23 are stored in advance. To be done.

The magnetic disk 14 has a plurality of full-color data 24a, 24b, and full-color data 24 in addition to various processed data by the CPU 11, for example.
dedicated N color data 25a, 25b corresponding to a, 24b,
The dedicated N-color reduction tables 26a and 26b and the N-color data 27 are written or read as needed.

The standard N color data 21 includes three primary colors (R,
Each of G and B) is represented by 8 bits. 2 ²⁴ (16
This is standard color data in which full colors (770,000 colors) are evenly allocated to 256 colors that can be expressed by this computer display.

In the standard N color reduction table 22, the color of each image element forming the full color compatible image data read by the image scanner 17 as display data corresponds to any one of the standard colors. It is a standard color-reduction table for supporting such.

The full-color data (1) 24a and the full-color data (2) 24b are different full-color image data read by the image scanner 17 as display data.

The dedicated N color data 25a and 25b are dedicated color data of 256 colors selected so as to come closest to the original color image according to the corresponding full color data (1) 24a or (2) 24b. .

The dedicated N color reduction tables 26a, 26
b is the corresponding full color data (1) 24a
Or (2) a dedicated color reduction table for instructing which of the corresponding dedicated colors 25a or 25b the color of each image element constituting 24b corresponds to. The tables 26a and 26b are created based on a preset color-reduction algorithm when the full-color data (1) 24a or (2) 24b to be subjected to the color-reduction is given.

Here, each of the above-mentioned full color data (1) 2
The storage areas 4a and (2) 24b are provided with a flag area F for storing display color designation information. When the flag "1" is set in the flag area F,
The full color data is displayed in reduced color in the corresponding dedicated color data.

The N-color reducing program 23 uses the full-color data (1) 24a provided as display target data.
Or (2) when the 24b is reduced in color and the dedicated color designation flag F is set in the full color data, the dedicated color reduction table 26a or 26b corresponding to the full color data and the dedicated color data 25a or 25
If the dedicated color designation flag F is not set, the full color data (1) 24a or (2) 24b is converted into the standard color reduction table 22 and the standard color. It is a color-reduction processing program for color-reduction conversion using the data 21, and the display data which is color-reduced into color data corresponding to standard 256 colors or dedicated 256 colors in accordance with the color-reduction program 23 is It is stored as the N color data 27.

On the other hand, the mouse 18 is the display 1
The color data displayed in 6 is operated when the standard color display or the dedicated color display is selected and designated, and when a plurality of color data are displayed, the display color selected and designated is displayed. It is operated when the priority color data you want to specify is specified. Next, the operation of the computer display equipped with the full color data color reduction display device having the above configuration will be described.

For example, two image data corresponding to full color based on image information such as a photograph are converted into the image scanner 17
Is read by the magnetic disk 14 and stored as full-color data (1) 24a and full-color data (2) 24b on the magnetic disk 14, respectively, and individually stored in the magnetic disk 14 so that the color images of the full-color data (1) 24a and (2) 24b come close to each other as much as possible. Color-selected data 1 dedicated N
Color data 25a and data 2 dedicated N color data 25b are stored, and further each dedicated N color data 25 is stored.
In the state where the data 1 exclusive N color reduction table 26a and the data 2 exclusive N color reduction table 26b for reducing the colors of a and 25b are created and stored based on a predetermined color reduction algorithm, the keyboard 15 Is operated to instruct display of the full color data (1) 24a and (2) 24b, the N color reduction program 23 previously stored in the main memory 13 is read out to the CPU 11, and the full color data (1) is read. Both 24a and (2) 24b are subjected to color reduction conversion in association with the standard N color data 21 based on the standard N color reduction table 22 previously stored in the main memory 13.

When the two color-reduced color data 27 corresponding to the standard N colors which have been color-reduced are obtained, the standard color-reduced color data (1) and (2) are transferred to the display 16. Is displayed. FIG. 3 is a diagram showing a display state of two color-reduced color data on a computer display equipped with the full-color data color-reduced display device.

When the operator wants to display the color data (1) displayed in the color data display window A as a color image closer to the original image,
The mouse cursor M on the screen is moved to the "dedicated" side of the color-reduction mode selection area P provided on the window A by the mouse 18 and the mouse button is operated.

Then, the "dedicated" display portion of the color-reduction mode selection area P designated by the mouse cursor M is highlighted, and the flag area F corresponding to the full-color data (1) 24a on the magnetic disk 14 is displayed. Has the flag "1" set, and the data 1 exclusive N color data 25a
Color reduction is specified.

As a result, the above full color data (1)
The data 24a is converted to a reduced color in association with the data 1-dedicated N color data 25a based on the data 1-dedicated N color reduction table 26a, stored as the reduced color data 27, and stored on the display 16 as color data. It is redisplayed in the display window A.

In this case, when the mouse cursor M exists in the color data display window A displaying the color data (1) in the dedicated color, it is displayed in the color data display window B as a standard color designation. The color data (2) is also displayed in reduced color in association with the data 1-dedicated N color data 25a based on the same data 1-dedicated N color reduction table 26a, that is, the color data designated by the cursor. In the state in which the color reduction method is selected to the "dedicated" side, the color data (1) is very close to the color image of the original image 1 dedicated N color data 25
Although the color data (2) is displayed in a reduced color with a, the other color data (2) displayed simultaneously is displayed in a state different from the original color image.

If the "dedicated" side of the color reduction method selection area P provided on the upper part of the color data display window B is designated, the full color data (2) is stored in the data 2 dedicated N color reduction table 26b. Based on the data 2, the N color data 25b for exclusive use of the data 2 is converted into a reduced color, and a color image closer to the original image is displayed.

In this case, the color data (1) displayed as a dedicated color designation on the color data display window A is also the same as the data 2 dedicated N color reduction table 2 for exclusive use.
The color data (2) is displayed in a state different from the color image of the original image because the color data (2) is displayed in a reduced color in association with the N color data 25 dedicated to data 2 based on 6b.

That is, if each of the color-reduction mode selection areas P in the color data display window A and the color data display window B is designated on the "dedicated" side,
By simply moving the mouse cursor M in the desired window A or B, the color data in the window can be reduced in color by being associated with the dedicated color and displayed in a state closer to the original color image.

On the other hand, if the mouse cursor M is moved into the window B with the color-reduction mode selection area P in the window B in which the color data (2) is displayed being designated as the "standard" side. The priority is given to the color reduction method specified on the window B side, and the full color data (2) is displayed in reduced color in association with the standard N color data 21 based on the standard N color reduction table 22. The color data (1) for which the dedicated color is designated on the side of the window A is also the standard N color reduction table 22 in the same manner as above.
The color data (1) and (2) are inferior to the original image when the dedicated color is selected, but are significantly different from the original image because they are displayed in reduced colors in correspondence with the standard N color data 21. It will be displayed in a color image that is unprecedented.

Therefore, according to the computer display equipped with the full-color data color-reducing display device having the above-mentioned configuration, when the image data corresponding to the full-color is read by the image scanner 17 and given as the data to be displayed, for example, there are 16.77 million colors. The full color is evenly allocated to 256 colors that can be displayed on the display and the main memory 13 is stored in advance.
Display using the standard N color data 21 stored in
Or 256 for each individual full color data
Whether the color is selected and displayed using the dedicated N color data stored in the magnetic disk 14 is selected by operating the mouse 18 using the color-reduction mode selection area P and the mouse cursor M on the display 16, In accordance with the selection result of the color-reducing method associated with the mouse operation, the displayed full-color data is associated with the standard N-color data or the dedicated N-color data, and the CPU 11 performs color-reduction conversion and displays it on the display 16. Therefore, if a plurality of color data are displayed at the same time and any one of them is desired to be viewed as an original image to some extent, all the color data should be displayed without any discomfort by conversion to the standard N color data. Can
Further, when it is desired to bring a certain specific color data closer to the original image, it is possible to display the original image with sufficient characteristics by the color reduction conversion to the dedicated N color data. Various display states can be obtained according to the content of the processing.

In the above embodiment, the standard N color reduction table 22 is stored in the main memory 13 in advance. However, when the standard N color reduction is selected, the standard N color reduction table 22 is stored. Instead of preparing a color reduction table in advance, each element color of full color data may be associated with the standard N color by a simple calculation.

Further, in the above embodiment, the standard N color data 21, the standard N color reduction table 22 and the N color reduction program 23 are made into a library so that a plurality of color data given by different applications can be used as a common standard. The color may be reduced to N colors for display. In this case, the process of reducing the number of colors to the dedicated N color may be different for each application.

Further, in the above embodiment, as a means for selecting the color-reducing method for the color data given as the display image data, the color-reducing colors provided in the color data display windows A and B on the display 16 are used. Although the "standard" side or the "dedicated" side of the conversion method selection area P is operated by operating the mouse cursor M, for example, a specific color indicating a standard color or a dedicated color is displayed on the color data display windows A and B. The symbols and marks may be selectively displayed, and the means for selecting the color reduction method is not limited in any way.

[0039]

As described above, according to the present invention, 2 ^{3 m} in which each of the three primary colors (R, G, B) is represented by m bits.
Full color of N colors (<2 ^{3 m} ) is converted into smaller colors and displayed. Standard N color data in which 2 ^{3 m} colors are evenly allocated to N colors and multiple full color compatible image data Dedicated N-color data selected exclusively for N, and standard color-reducing means for reducing the color of each image element in the full-color compatible image data by associating it with the standard N-color data.
Dedicated decolorizing means for decolorizing and converting each image element in full-color compatible image data to the dedicated N-color data, and the standard N when the full-color compatible image data is given as display target data. Display color selection means for selecting whether to display using the color data or the dedicated N color data, and the standard image color reduction of the displayed image data according to the selection result by the selection means. Means or a dedicated color-reducing means for reducing the color of the standard N-color data or the dedicated N-color data and converting the reduced color, and the displayed data reduced in color by the color-reducing control means. Since the display means for displaying is provided, even when a plurality of color image data is given as display target data,
The display image of each image data is not different from the original color image at all, and moreover, it is possible to display a desired image data as a color image closer to the original image.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a computer display equipped with a full color data color reduction display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing contents of various data stored in a main memory and a magnetic disk in a computer display equipped with the full color data color reduction display device.

FIG. 3 is a diagram showing a display state of two color-reduced color data on a computer display equipped with the full-color data color-reduced display device.

[Explanation of symbols]

11 ... CPU (central processing unit), 12 ... system bus,
13 ... Main memory, 14 ... Magnetic disk, 15 ... Keyboard, 16 ... Display, 17 ... Image scanner, 1
8 ... Mouse, 21 ... Standard N color data, 22 ... Standard N color reduction table, 23 ... N color reduction program, 24a ...
Full color data (1), 24b ... Full color data (2), 25a ... N color data dedicated to data 1, 25b ... N color data dedicated to data 2, 26a ... N color reduction table dedicated to data 1, 26b ... N dedicated to data 2 Color reduction table, 27 ... N color data, A, B ... Color data display window, P ... Reduction method selection area, M ... Mouse cursor.

Claims (1)

[Claims] 1. A full color of 2 ^{3 m} colors in which each of the three primary colors (R, G, B) is represented by m bits is N colors (<2 ^{3 m} ).
Full-color data that is converted into less colors and displayed in a reduced-color display device. Standard N-color data in which 23 ^m colors are evenly assigned to N colors and N-color data exclusively for full-color compatible image data are used. Standard decolorizing means for converting the selected dedicated N color data and each image element in the full color compatible image data to the standard N color data, and each image in the full color compatible image data. Dedicated decolorizing means for decolorizing and converting an element in association with the dedicated N color data, and when image data corresponding to full color is given as display target data, is displayed using the standard N color data, or Display color selection means for selecting whether to display using the dedicated N color data, and the display target image data according to the selection result by the selection means, the standard color reduction means or the dedicated small color A color reduction control means for performing color reduction conversion by associating with standard N color data or dedicated N color data, and display means for displaying the displayed data color-reduced by the color reduction control means. A full color data color reduction display device characterized by the above.