CN100374301C - Print data conversion method and apparatus - Google Patents

Abstract

The invention discloses a method and a device for converting printing data, which can convert and print the printing data with any resolution, firstly convert an original image of the original resolution into an ink drop image represented by corresponding ink drop number, then obtain a printing ink drop image with new resolution by using the principle of ink drop balance, wherein the ink drop image and the printing ink drop image have the same ink drop number, and finally convert the printing ink drop image into a printing halftone image and output the printing halftone image. The invention relates to a method and a device for converting printing data, wherein when printing with different printing resolutions, a halftone image can be obtained by conversion without any color experiment, and the image can be printed with any resolution by the conversion mechanism, and the high resolution and the low resolution can be converted with each other, compared with the original image, the quality of the image is not changed, and the color is not greatly different.

Description

Print data conversion method and device thereof

technical field

The invention relates to a print data conversion method and its device, which are applied to image output devices such as printers, in particular to a print data conversion method and its device which can directly convert and output the resolution of print data.

Background technique

With the maturity of digital technology, the application of digital images is becoming more and more extensive. Not only can images be captured and new images created through the combination of digital cameras and computers, but they can also be output directly using image output devices, such as the current digital photo printers. , almost all integrate the memory card slot and LCD screen. The memory card slot usually supports most of the memory card specifications on the market, so it is no longer necessary to use the computer as the interface for printing. Just insert the captured memory card into the printer. Directly use the LCD screen and buttons on the printer to perform the work of selecting and printing, which is very convenient and fast.

However, digital images are usually composed of three primary colors: red (R), green (G), and blue (B) mixed in different proportions. Many image output devices and display devices cannot produce sufficient color levels. For digital images, the digital images will first be converted into the color gamut space of the output device. Taking a printer as an example, the colors are usually cyan (C, Cyan), magenta (M, Magenta) and yellow (Y, Yellow) , and then the image will be degraded so that the original multi-color-level image becomes a low-level image. This step is called halftone processing. Each pixel in the halftone image is represented by a different degree. Corresponds to different ink drop counts. Finally, the halftone image will be converted into print data output according to the ink hole arrangement of the inkjet head, and finally a print image can be seen.

With the advancement of printing systems and inkjet heads, the printing resolution has increased from 300 dots per inch (DPI, Dot/Inch) more than ten years ago to more than 4800DPI at present. Generally speaking, the resolution of a digital image has been determined when shooting or scanning, and only the printing resolution can be changed when printing. However, the size of the printed output image will change with the printing resolution. The higher the resolution, the smaller the printed image. Therefore, in order to obtain a fixed image output at different printing resolutions, some processing must be done on the printed image; on the other hand, printing modes with different resolutions must go through color experiments to obtain the relationship between the halftone degree and the ink drop. , and each experiment must spend a lot of manpower and time, especially in high-resolution printing mode.

In order to solve the above problems, U.S. Patent No. 5,480,240 directly repeats the original 300DPI print data in the horizontal direction, that is, the original one point becomes two points, and in order to maintain the characteristics of the original printed image, it will double the print data. The data is corrected, and the corrected action is to extract dots, so that there will be no printing of two adjacent dots, forming a virtual 600DPI printing data. This method only achieves 600DPI printing in the horizontal direction, and its data form is not strictly 600DPI.

The U.S. Patent No. 5,742,300 also enhances the horizontal printing resolution. The method first multiplies the data horizontally, and one point becomes two points. Since the multiplied printing data will cause the edge to be blurred, the part of the edge will be extracted. As for the processing of dots, as for the non-edge part, the printing data will be reduced by using checkerboard shielding, which makes the printing ink as much as possible the same as the original resolution printing. This method still only enhances the horizontal resolution, and the edge part of the image must be detected, and the calculation is quite complicated.

In addition, U.S. Patent No. 5,912,683 proposes a method for enhancing the horizontal printing resolution. The method is not to directly double the image, but to dither the table (Dither Table) in the halftone process. The same pixel of the image will be compared with the two thresholds (Threshold) of the transition table twice in the horizontal direction. Therefore, the same pixel will get two halftone pixel outputs. This method is limited to halftone processing using the dithering method, and the quality of the halftone image obtained by the dithering method is poor, and the number of ink droplets per unit area will increase, which may cause ink overflow or even color shift.

The method used in the US Patent No. 6,075,926 is to use in low-brightness areas, because human vision is less sensitive, the method of copying or averaging is used to increase the number of points, but when the brightness is greater than a certain threshold, the way of looking up the table is used Let's make a point. First, create a database (Data Base), which contains different image features, corresponding to the 4 filter matrices (Filter Matrix) required for the operation from one point to 4 points. In the actual calculation, take the processing point as the center, and subtract the processing point from the surrounding 8 points to form an 8-dimensional vector. After calculation and comparison, find a group or array in the database that corresponds to the characteristics of the current processing point. Matrix, and then calculate the value of the last interpolated point with a similar degree of weight. This method needs to build the database offline and store it in the memory. Although the image quality of the interpolated image is better when the database is larger, the memory space occupied and the amount of calculation required for the comparison are also relatively increased. On the contrary, the image The quality is relatively poor. On the other hand, different databases are required for different magnifications, which means more memory is required.

The U.S. Patent No. 6,411,399 is because the original printing data will be multiplied according to the printing resolution to be converted. If the printing data is completely printed on the paper, the amount of ink will also be doubled, and the color overflow will be quite serious. Therefore, the use of shielding will Redundant printing data is removed, and this mask will change with the printing position, so that the ink volume will not change due to the resolution change. Although this method keeps the amount of ink constant, the print data will change due to the position, which is equivalent to the pixel points originally printed in the center being scattered around, which may cause the deterioration of the print quality, and when the two points are in the Bleeding still occurs when adjacent prints are made at high resolutions.

From the above, when you want to change the print resolution output, you must first do an experiment of the halftone level corresponding to the number of ink drops. On the other hand, when printing the image stored in the memory card, the size of the output image will vary with the print resolution. Therefore, it is necessary to provide a print data conversion method and device that can achieve print output with different resolutions and save manpower and time in color experiments, so as to overcome the above-mentioned defects.

Contents of the invention

The object of the present invention is to provide a method and device for converting print data. When printing with different print resolutions, halftone images can be obtained through conversion without any color experiment. Images can be printed at any resolution, and high-resolution and low-resolution can be converted to each other. Compared with the original image, the quality of the obtained image will not change, and the color will not be much different.

In order to achieve the above object, the present invention provides a print data conversion method, comprising the following steps:

input an original image with original resolution;

Converting the original image into an ink drop image, each unit area of the ink drop image has a corresponding number of ink drops;

Evenly distribute the corresponding ink drops of the ink drop image to the corresponding positions of a new resolution, generate a print ink drop image corresponding to the new resolution, and divide the corresponding ink drop by the new resolution and the original resolution The ratio of the converted ink droplet is obtained, and the converted ink droplet is equally divided to form the printing ink droplet image at the corresponding position of the new resolution, so that the ink droplet image and the printing ink droplet image have the same ink droplet number;

converting the printed ink drop image into a printed halftone image; and

Outputs the printed halftone image.

In the printing data conversion method described above, the original image is represented in halftone levels.

In the printing data conversion method described above, when the number of converted ink droplets is a non-positive integer, the sum of ink droplets at the relative position of the new resolution is fixed to the sum of ink droplets at the original resolution, and the number of ink droplets is averaged.

In the above printing data converting method, wherein, the number of ink drops is averaged in such a way that a part of the number of ink drops is a positive integer less than the number of converted ink drops and a part of the number of ink drops is a positive integer greater than the number of converted ink drops.

In the above printing data conversion method, wherein, the step of evenly distributing the corresponding ink droplet of the ink droplet image to a corresponding position of a new resolution, and generating a printing ink droplet image corresponding to the new resolution is performed by querying a Ink drop conversion table way to perform.

In the printing data conversion method described above, the ink drop conversion table is established based on the principle that the sum of ink drops at the relative position of the new resolution is fixed to the sum of ink drops at the original resolution.

In order to better achieve the above purpose, the present invention also provides a print data conversion device, including:

an image input unit, used to generate an original image with original resolution;

A unit corresponding to the number of ink drops in the original resolution is used to convert the original image into an ink drop image, and each unit area of the ink drop image has a corresponding ink drop number;

An ink drop balance unit, which converts the corresponding ink drop of the ink drop image to the corresponding position of a new resolution, generates a print ink drop image corresponding to the new resolution, and divides the corresponding ink drop by the new resolution Ratio to the original resolution to obtain a converted ink drop number, and equally divide the converted ink drop number to form the print ink drop image at the corresponding position of the new resolution, so that the ink drop image and the print ink drop the images have the same drop count; and

A new resolution halftone ink drop processing unit converts the print ink drop image into a halftone image for output.

The above-mentioned print data conversion device is characterized in that the original image is represented in halftone level.

The above-mentioned printing data conversion device is characterized in that, when the number of converted ink droplets is a non-positive integer, the sum of the ink droplets at the relative position of the new resolution is fixed with the sum of the ink droplets at the original resolution, and the ink droplets are homogenized number.

The print data conversion device above is characterized in that the number of ink drops is averaged in such a way that a part of the number of ink drops is a positive integer less than the number of converted ink drops, and a part of the number of ink drops is a positive integer greater than the number of converted ink drops.

The above-mentioned print data conversion device is characterized in that the ink drop balance unit includes an ink drop conversion table.

The print data conversion device above is characterized in that the ink drop conversion table is established based on the principle that the sum of ink drops at the relative position of the new resolution is fixed to the sum of ink drops at the original resolution.

The printing data conversion method and device disclosed in the present invention can obtain halftone images through conversion when printing with different printing resolutions, without any color experiment, and this conversion mechanism can convert images into Print out at any resolution.

Compared with the methods used in the prior art, most of them only change the printing resolution in the horizontal direction, and can only convert from low resolution to high resolution. Moreover, the conversion magnification is mostly 2, while the present invention uses The method can be converted to any resolution, and can be converted between high resolution and low resolution.

Using the method disclosed in the invention to convert the resolution of printing data, compared with the original image, the quality of the obtained image will not change, and the color will not be much different.

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the flowchart of the print data conversion method of the present invention;

Fig. 2 is a system block diagram of the printing data conversion device of the present invention;

Fig. 3 is the halftone image data of the original image whose printing resolution is 300*300 in the embodiment of the present invention;

FIG. 4 is an ink drop image with a printing resolution of 300*300 in an embodiment of the present invention;

Fig. 5 is the printing ink droplet image that printing resolution is 600*600 in the embodiment of the present invention; And

FIG. 6 is the printed halftone image data with a printing resolution of 600*600 in an embodiment of the present invention.

Among them, reference signs:

10 Image input unit

20 original resolution ink drop number corresponding unit

30 ink drop balance unit

40 new resolution halftone drop processing units

Detailed ways

The print data conversion method and its device of the present invention realize the conversion and output of print data resolution based on the concept of ink drop balance.

The printing data conversion method of the present invention shown in Fig. 1 is applied in image output devices such as printers, and can directly convert the resolution of printing data and output it, and its main process includes the following steps:

First, input an original image with original resolution (step 100);

Then, converting the original image into an ink drop image (step 200), and each unit area of the ink drop image has a corresponding number of ink drops;

Then evenly distribute the corresponding ink drops of the ink drop image to the corresponding positions of the new resolution, generate a print ink drop image corresponding to the new resolution (step 300), and make the ink drop image and the print ink drop image have the same ink drop number;

Subsequently, converting the printed ink drop image into a printed halftone image (step 400);

Finally, print the halftone image (step 500).

In addition, as shown in Figure 2, according to the above-mentioned print data conversion method, the print data conversion device provided by the present invention includes an image input unit 10, a corresponding unit 20 for the original resolution ink drop number, an ink drop balance unit 30 and A new resolution halftone ink drop processing unit 40, and the ink drop balance unit 30 has an ink drop conversion table. The principle is established; when the image input unit 10 generates the original image with the original resolution, the original resolution ink drop number corresponding unit 20 will convert the original image into an ink drop image, and make each unit area of the ink drop image have a Corresponding to the corresponding number of ink drops, and then use the ink drop balance unit 30 to convert the corresponding ink drops of the ink drop image to the corresponding position of the new resolution, and generate the printing ink drop image corresponding to the new resolution, so that the ink drop image and The print ink drop images have the same number of ink drops, and the print ink drop images are converted into halftone images by the new resolution halftone ink drop processing unit 40 for output.

The present invention will be described in detail below.

Assume that the original resolution of the original image is VRori*HRori (step 100 ), and the original image is represented by N bits, that is, each pixel of the original image has at most 2N variations, and these variations represent different halftone levels. In actual printing, different halftone levels will have different ink droplet counts. Table 1 is the correspondence table between the original resolution halftone level and the corresponding ink droplet counts. In order to facilitate the distinction, the ink droplets with different halftone degrees of the original resolution and the new resolution are respectively named as the corresponding ink droplets and the converted ink droplets. In addition, the halftone images of the original resolution and the new resolution are respectively named as Halftone images and printing halftone images.

Table I

halftone level Code (N bit) Corresponding to the number of ink drops 0 00...0 0 1 00...1 . . . . . . . . . . 2^N-1 11...1 m

If the new resolution to be output is VRnew*HRnew, that is, the printing resolution of the original image will be converted from the original resolution VRori*HRori to the new resolution VRnew*HRnew. Here, the corresponding relationship between the degree of halftone and the number of converted ink droplets under the new resolution must be obtained first. Theoretically, when the ink and paper have not changed, no matter how the resolution changes, the total amount of ink droplets per unit area should be exactly the same. According to the formula (1), one pixel of the original image with the original resolution The relationship with the new resolution pixels can be calculated, we call the relationship between the two conversion ratio (Conversion Ratio).

CR＝(VR _new *HR _new )/(VR _ori *HR _ori )(1)

Taking one pixel of the original image as the unit area, after converting it into the new resolution, it is equivalent to CR new resolution pixels as the unit area. Using the concept that the sum of ink droplets in the unit area must be equal, we can know that CR new resolution The total number of ink droplets printed in the resolution pixels, that is, there are at most 2N combinations of corresponding ink droplets in CR pixels. The corresponding ink droplets of these 2N combinations can be found from Table 1, and the corresponding ink Divide the number of drops by the conversion ratio CR to get the number of converted ink drops, and then distribute the converted ink drops of each halftone level to each pixel in CR pixels, so that all the possible occurrences of new resolution pixels can be obtained Convert the drop count combination. Table 2 is the halftone degree of the original resolution and the ink drop conversion table of the pixel of the new resolution.

Table II

original resolution new resolution halftone level A single pixel corresponds to the number of ink drops Convert the number of ink drops per unit area The number of ink drops converted by a single pixel point 0 0 0 0 1 . . . . . . . . . . . . . . . 2^N-1 m m M/CR

Under the new resolution, the number of converted ink drops printed by each pixel is at least 0, and the maximum is M/CR drops. According to the number of converted ink drops from small to large, there are P types of converted ink drops. This P The number of digits Q required for this conversion of the number of ink drops can be obtained by formula (2). In the formula, the MAXINT () function means to take its maximum integer value, that is, Q bits can be used to represent each pixel of the new resolution halftone image , so we get the correspondence table between the halftone degree of the new resolution and the number of converted ink drops, as shown in Table 3. This correspondence table provides the new resolution for printing halftone images for encoding.

$\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; MAXINT</span>}<span\; class="notranslate">\; (</span>\sqrt{\mathrm{<span\; class="notranslate">\; P</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Table three

halftone level Code (Q bit) Convert the number of ink drops 0 00...0 0 1 00...1 . . . . . . . . . . P-1 11...1 M/CR

The following further describes how to realize the conversion and output of the print data resolution by using the print data conversion method and the device provided by the present invention.

First, after the image input unit 10 of the printing data conversion device generates an original image with the original resolution (step 100), the original resolution ink drop number corresponding unit 20 first converts the pixels of the original resolution halftone image After all the pixels are converted into the corresponding number of ink droplets, an ink drop image with original resolution is obtained, that is, a halftone image represented by the corresponding ink droplets (step 200 ). For ease of distinction, the ink droplet images of the original resolution and the new resolution are referred to as the ink droplet image and the printed ink droplet image below, respectively.

Then, the ink drop balance unit 30 will use the ink drop conversion table to convert each pixel of the ink drop image with the original resolution into CR pixels according to the conversion ratio CR, wherein the conversion ratio CR is the new resolution and the original resolution The ratio, the number of ink drops in this CR pixel must be the same as the number of ink drops in one pixel of the original resolution. Therefore, divide these corresponding ink drops by the conversion ratio CR to obtain the number of converted ink drops, and then convert The number of ink droplets is allocated to CR pixels, and when all the pixels are converted, a print image of ink droplets with a new resolution can be obtained (step 300 ).

Finally, the new resolution halftone ink droplet processing unit 40 converts the printed ink droplet image into a halftone level to obtain a new resolution printed halftone image (step 400 ), which can be encoded. The high resolution printed halftone image can be input to a printer system for printing (step 500).

In one embodiment, the data of the original image with the original resolution of 300*300 generated by the image input unit 10 is 8 bits (step 100 ), in other words, the input value of the original image ranges from 0-255. The halftone output is 2 digits: 00, 01, 10 or 11. The relationship between the halftone degree and the corresponding number of ink drops is shown in Table 4, where 00 means that the pixel needs to print 0 corresponding ink drops ;01 means to print 4 corresponding ink drops; 10 means to print 8 corresponding ink drops; 11 means to print 12 corresponding ink drops.

Table four

halftone level Code (2 digits) Corresponding to the number of ink drops 0 00 0 1 01 4 2 10 8 3 11 12

As shown in Figure 3, the size of the original image after halftone conversion is 10*10 by using the original resolution ink drop number corresponding unit 20, and the number on the pixel indicates the halftone degree after encoding, which is converted into a corresponding image according to Table 4 After counting the ink droplets, the image of the ink droplets can be obtained, as shown in FIG. 4 (step 200).

At this time, if the original image is to be printed with a new resolution of 600*600, first of all, it is required to obtain a corresponding relationship table between the degree of halftone under the new resolution and the number of converted ink droplets. The conversion ratio CR can be obtained by formula (1), and its value is 4, that is, one pixel of the original resolution is equivalent to four pixels of the new resolution. We use one pixel of the original resolution as the unit area, because The number of ink droplets per unit area will not change. The number of ink droplets corresponding to the halftone degree of the original resolution is divided by the conversion ratio CR, that is, the number of converted ink droplets is obtained, and the number of converted ink droplets is allocated to the new resolution. Pixels can get the ink drop conversion table in Table 5.

Table five

Resolution 300*300 Resolution 600*600 halftone level A single pixel corresponds to the number of ink drops Convert the number of ink drops per unit area The number of ink droplets converted by a single pixel point 0 0 0 0 1 4 4 1 2 8 8 2 3 12 12 3

Then, through the ink drop conversion table (Table 5), each pixel of the ink drop image with the original resolution of 300*300 can be converted into 4 of the new resolution of 600*600 by the ink drop balance unit 30 according to the conversion ratio 4 pixels, the number of converted ink drops in these 4 pixels is the same as the number of corresponding ink drops in the original resolution of 300*300 pixels, and the corresponding ink drops are allocated in an even distribution method, that is, the converted ink drops are distributed To 4 pixels, when all the pixels are converted, a printed ink drop image with a printing resolution of 600*600 can be obtained, as shown in Figure 5. (step 300)

Under the new resolution of 600*600, the number of ink drops printed by each pixel is at least 0 and the maximum is 3. According to the number of ink drops in ascending order, there are 4 types of ink drops. These 4 types of ink The number of bits required for coding the number of drops is calculated as 2 according to formula (2), therefore, 2 bits can be used to represent each pixel of the halftone image when the new resolution is 600*600, and the new resolution is 600 *When 600, the corresponding table of the halftone level and the number of converted ink drops is shown in Table 6. The correspondence table can provide a halftone image with a new resolution of 600*600 for encoding (step 400).

Table six

halftone level Code (2 digits) Convert the number of ink drops 0 00 0 1 01 1 2 10 2 3 11 3

Finally, the halftone ink droplet processing unit 40 with the new resolution outputs the coded printed halftone image according to Table 6. The printed ink droplet image is shown in FIG. Use at 600 (step 500).

It must be added that when the number of converted ink droplets obtained by converting the corresponding ink droplets according to the conversion ratio CR by the ink drop balance unit 30 is a non-positive integer, the sum of the ink droplets of each CR pixel point must be equal to the original The total number of ink drops with a resolution of one pixel is the same to distribute the number of ink drops, so set some to be the closest to and less than the number of converted ink drops, and set some to be the closest to and greater than the number of converted ink drops to balance Number of ink drops; for example, if the original resolution of 300*300 pixels corresponds to 1 ink drop, and the new resolution is 600*600, the calculated conversion ratio CR is 4. The number of converted ink droplets is 1/4, but the total number of converted ink droplets for every 4 pixels of the new resolution is equal to the total number of corresponding ink droplets for one pixel of the original resolution To distribute the number of ink drops, therefore, the number of converted ink droplets of these 4 pixels can be distributed in the manner of 1, 0, 0, 0 respectively.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. a printing data conversion method comprises the following steps:

Input one raw video with former resolution ratio;

Changing this raw video is an ink droplet image, and the per unit area of this ink droplet image has a corresponding ink droplet number respectively;

The opposite position of the new resolution ratio of the corresponding ink droplet to of this ink droplet image of mean allocation, produce a printed dot image corresponding to this new resolution ratio, this correspondence ink droplet is obtained a conversion ink droplet number divided by this new resolution ratio with the ratio of this former resolution ratio, and divide equally this conversion ink droplet number and form this printed dot image at the opposite position of this new resolution ratio, make this ink droplet image have identical ink droplet number with this printed dot image;

Changing this printed dot image is a printing halftoning image; And

Export this printing halftoning image.

2. printing data conversion method according to claim 1 is characterized in that this raw video is represented with the kenel of halftoning degree.

3. printing data conversion method according to claim 1 is characterized in that, when this conversion ink droplet number is non-positive integer, makes the ink droplet summation of the relative position of this new resolution ratio fix this ink droplet number of homogenizing with the ink droplet summation of this former resolution ratio.

4. printing data conversion method according to claim 3 is characterized in that, this ink droplet number is got positive integer with part and got positive integer and come this ink droplet number of homogenizing greater than the mode of this conversion ink droplet number less than this conversion ink droplet number and part.

5. printing data conversion method according to claim 1, it is characterized in that, the opposite position of the new resolution ratio of this correspondence ink droplet to of this ink droplet image of this mean allocation, generation one is carried out by the mode of inquiring about an ink droplet conversion table corresponding to the step of the printed dot image of this new resolution ratio.

6. printing data conversion method according to claim 5 is characterized in that, this ink droplet conversion table is by the ink droplet summation and the fixing principle foundation of the ink droplet summation of this former resolution ratio of the relative position of this new resolution ratio.

7. print data conversion equipment comprises:

One image input block is used for producing a raw video with former resolution ratio;

One former resolution ratio ink droplet is counted corresponding unit, is used for this raw video is converted to an ink droplet image, and the per unit area of this ink droplet image has a corresponding ink droplet number respectively;

One ink droplet balancing unit, the corresponding ink droplet of this ink droplet image is converted to the opposite position of a new resolution ratio, produce a printed dot image corresponding to this new resolution ratio, this correspondence ink droplet is obtained a conversion ink droplet number divided by this new resolution ratio with the ratio of this former resolution ratio, and divide equally this conversion ink droplet number and form this printed dot image at the opposite position of this new resolution ratio, make this ink droplet image have identical ink droplet number with this printed dot image; And

One new resolution ratio halftoning ink droplet processing unit is the output of halftoning image with this printed dot video conversion.

8. print data conversion equipment according to claim 7 is characterized in that this raw video is represented with the kenel of halftoning degree.

9. print data conversion equipment according to claim 7 is characterized in that, when this conversion ink droplet number is non-positive integer, makes the ink droplet summation of the relative position of this new resolution ratio fix this ink droplet number of homogenizing with the ink droplet summation of this former resolution ratio.

10. print data conversion equipment according to claim 9 is characterized in that, this ink droplet number is got positive integer with part and got positive integer and come this ink droplet number of homogenizing greater than the mode of this conversion ink droplet number less than this conversion ink droplet number and part.

11. print data conversion equipment according to claim 7 is characterized in that, this ink droplet balancing unit comprises an ink droplet conversion table.

12. print data conversion equipment according to claim 11 is characterized in that, this ink droplet conversion table is by the ink droplet summation and the fixing principle foundation of the ink droplet summation of this former resolution ratio of the relative position of this new resolution ratio.

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