JPH036732A - Hard copy circuit - Google Patents

Abstract

PURPOSE:To freely perform a hard copy operation with the black and the white designated at every pixel value by carrying out the logic operation based on the black/white information designated at every pixel value and outputting the result of this operation to a printer. CONSTITUTION:It is supposed that a VRAM 5 constituted of 4 planes. Thus a logic operation formula calculation part 2 calculates a prescribed logic operation formula among those planes based on the information on the pixel values received from an input part 1 to be printed in black and white respectively. This calculated formula is stored in a logic operation formula buffer 3. A hard copy part 4 takes the head rasters of 4 planes out of a plane 0 of the VRAM 5 and performs a logic operation based on the logical arithmetic formula stored in the buffer 3. The result of this arithmetic operation is outputted to a printer 6. Thus it is possible to freely perform a hard copy operation with the black and the white designated at every pixel value.

Description

Detailed Description of the Invention: Industrial Application Fields of the Invention The present invention (companies) In equipment having a plain type VRAM such as a personal computer, it is possible to
This is related to a hard copy circuit that can perform hard copying to a value printer with a simple configuration and by freely specifying black and white for each pixel value.
When outputting to a value printer, a method is used to perform OR processing between the planes and output the result to the printer. Pixels are white, and pixels with a pixel value of 1 or more are printed as black, and depending on the state of the VRAM, most pixels become black, making it impossible to obtain an accurate hard copy. There are nine problems.The present invention takes into account these problems.
The purpose of the present invention is to provide a hard copy circuit which has a simple configuration and is capable of freely specifying black and white for each pixel value to perform hard copying to a black and white binary printer. Means of the Present Invention (Dai) A logical operation formula calculation unit that calculates a logical operation formula between planes based on information on pixel values to be printed in black and pixel values to be printed in white; The present invention is also applicable to a hard copy circuit having a hard copy portion that performs logical operations between planes based on the calculated logical operation formula and outputs the results to a printer.
When making a hard copy to a black and white binary printer, by performing a logical operation using the black and white information specified in the pixel plating and outputting the result to the printer, you can freely specify black and white for each pixel value. Embodiment Figure 1 shows a block diagram of a hard copy circuit in an embodiment of the present invention. In Figure 1,
1 inputs information on pixel values to be printed in black and pixel values to be printed in white.Input section 2 inputs information on pixel values to be printed in black and pixel values to be printed in white input from input section 1. 3 is a logical operation expression buffer that stores the logical operation expression calculated by the logical operation expression calculation unit 2, and 4 is stored in the logical operation expression buffer 3. 5 is a VRAM, and 6 is a printer.
The operation of the hard copy circuit of this embodiment configured as described above will be explained below. Assuming that the VRAM 5 is composed of four planes, the pixel values to be printed in black and white as shown in Figure 2 are as follows. If the information on the pixel values to be printed is input from the input section l, then the hard copy part 4 (
Receives information on pixel values to be printed in black and pixel values to be printed in white as shown in FIG. 2 from the input unit 1, and performs the following processing.

(1) The hard copy part 41 also sends information on pixel values to be printed in black and pixel values to be printed in white as shown in FIG. 2 to the logical operation formula calculation unit 2. From the information on the pixel values to be printed in black and the pixel values to be printed in white as shown in Figure 2, calculate the logical operation expression % expression % D: plane 3) between the planes and store it in the logical operation expression buffer 3. (3) Hard copy part 4 L VRAM5i7) Extract the first raster of 4 planes from the O plane. Based on the logical operation formula stored in the logical operation expression buffer 3, perform the logical operation on the line too\\ Output to the printer 6. (4) (3)
The above processing is performed up to the final raster in VRAM5.

As described in detail, according to the present invention, it is possible to freely specify black and white for each pixel value to make a hard copy, and its practical effects are as follows:

[Brief explanation of drawings]

Figure 1 shows the block configuration of a hard copy circuit according to an embodiment of the present invention. Figure 2 shows information on pixel values to be printed in black and pixel values to be printed in white in an embodiment of the present invention. FIG. 1... Input section, 2... Logical operation formula calculation section, 3.
...Logical operation buffer 4...Part of hard copy, 5...VRAM, 8...Printer.

Claims (1)

[Claims] In a hard copy of a plane-type VRAM, a logical operation expression calculation unit that calculates a logical operation expression between planes based on information of pixel values to be printed in black and pixel values to be printed in white, and the logical operation expression a logical operation expression buffer that stores the logical operation expression calculated by the calculation section; and a hard copy section that performs logical operations between the planes based on the logical operation expression stored in the logical operation expression storage section and outputs the results to the printer. A hard copy circuit characterized by comprising: