JPS62222774A - Color data conversion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A device that converts R, G, and B color information into, for example, print information, which indexes a table using data obtained by decoding R, G, and H color information signals. The configuration is such that
Reduce processing time.

[Industrial application field]

The present invention relates to a color data conversion device, particularly for R and G.

The present invention relates to a color data conversion device capable of converting a B signal into C, M, Y, and B signals at high speed.

For example, in a color display device, R,G.

The original image is reproduced using signals of the three colors B, but in color printers, color copiers, etc.
, the B signal is the three primary colors of ink (cyan 20, magenta 2M
, yellow (Y) and black (BL) and are recorded on plain paper or the like.

In such conversion, since the conversion efficiency is related to the printing processing time, it is desired to improve the conversion efficiency.

[Conventional technology]

Data extracted from each point of the red plane, green plane, and blue plane (e.g., 8 gradation display using 3 bits) is extracted from each point of the magenta plane, cyan plane, yellow plane, and black plane using a logic circuit or the like. It decides whether to turn it on or off.

[Problem that the invention seeks to solve]

This conventional color data conversion device has disadvantages in that the conversion efficiency is poor and the conversion takes time because it requires (number of branes x number of data) determination processing during conversion.

The present invention was created in view of the above points, and an object of the present invention is to provide a color data conversion device that can efficiently perform color conversion by devising a simple correspondence between converted color data. The purpose is

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of a color data conversion device according to the present invention.

In the figure, 1 is a first storage section that stores first color data.

21 is a decoder that decodes first color data given as an input signal from the first storage section 1;

Reference numeral 22 is a table that outputs information on whether or not the points of each output brane corresponding to the input data are set.

3 is a second storage unit that stores second color data obtained by indexing a table based on input data.

[Effect]

The relationship of output color data to input color data is given in a table, and this table is searched by the decoded output of the input color data. By this search, for example, C, M
, Y, and BL at the same point of each prenin are performed at the same time, thus making it possible to shorten the color conversion time.

〔Example〕

FIG. 2 shows an embodiment of the present invention, in which the storage unit 1 includes a memory 1) for R (red) branes. Memory for G (green) brane 12. It consists of a memory 13 for B (blue) brane.

The ROM unit 2 includes a decoder 21 and a ROM 22 that functions as a table. In addition, the memory section 3 includes M
(magenta) brane memory 31, C (cyan) brane memory 32. Memory 3 for Y (yellow) brane
3. It consists of a memory 34 for the BL (black) brane.

The R, G, and B color data are stored in memories 1) to 13 for each color. Each of memories 1) to 13 includes memory 1).
.about.13 common address lines A1 and data lines Di, D2 .
03 is connected. The data lines D1 to D3 contain signals at any corresponding and identical positions (points) of each brane specified by the address line A1 in memories 1) to 13.
It is output from The signal on the data line Di-03 is output to the decoder 21 and decoded into table index data.

The signal decoded by the decoder 21 is stored in the ROM2
2 table is indexed and the data line D is sent to the memories 31 to 34.
4 to D7, and set at a point designated by address line A2 common to memories 31 to 34.

For example, the following combinations can be considered as tables set in the ROM 22.

As shown in the table above, the input to the decoder 21 is the data line D.
i, D2. When given in 3 bits via D3, 4 bits are sent to data l14 to D7 for 8 types of combinations.
Eight types of bit combination data are output. The left column and right column in the table correspond to each other, and DI, D2.
When D3→0.0°0=(black), D4. D5. D6.
D? −〇.

0.0.1=(black) is searched. As is clear from this, color conversion at the same point of the four branes (M, C, Y, BL) is performed simultaneously by searching D4 to D7 at the same time.

In the printer, R, G, B are printed while referring to the plain data in memories 31 to 34.
Based on the signal, printing is performed in the same color as the display displaying the image.

As described above, by performing color data conversion using a table, conversion can be completed in about 1/4 of the time compared to color data conversion using conventional logic circuits. In particular, 1) 0 devices with different packaging systems, such as color displays and color printers, have a set of color planes (R, G).

A remarkable effect appears when converting color data when B) is shared.

In addition, as color data, M, C, for R, G, B,
It is clear to those skilled in the art that the present invention is not only effective for the relationship between Y and BL.

〔Effect of the invention〕

As described above, according to the present invention, conversion efficiency can be increased and conversion time can be shortened by simplifying the process of generating output color data from input color data.

[Brief explanation of drawings]

FIG. 1 is a principle block diagram of a color data conversion device according to the present invention, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1 and 2, 1 and 3 are memory sections, 2 is a ROM section, 1). 12, 13, 31, 32. 33 and 34 are memories, 21 is a decoder, and 22 is a ROM (table). Wats 4' Sun Moon's Fugori Fukuro Nukku Diagram 1

Claims (2)

[Claims] (1) a first storage section (1) that stores first color data; a decoder (21) that decodes the first color data given as an input signal from the first storage section (1); a table (22) that stores the second color data corresponding to the first color data; and a table (22) that stores a value searched in the table (22) using the output signal of the decoder as the second color data. 1. A color data conversion device comprising two storage units (3). (2) The first color data consists of a combination of red, green, and blue, and the second color data consists of a combination of mazereta, cyan, yellow, and black. Color data conversion device.