CN103373098B - The printing process of color compensation and device - Google Patents

Abstract

The present invention provides a printing method and device for color compensation. The method includes: presenting a reference color block with a real chromaticity value on a display; measuring the reference color block on the display to obtain a measured chromaticity value; A deviation of the measured colorimetric value from the true colorimetric value compensates for the job to be printed. The present invention provides a printing device for color compensation, comprising: a display module, used to present a reference color patch with a true chromaticity value on a display; a measurement module, used to measure the reference color patch on the display Obtaining the measured chromaticity value; a compensating module configured to compensate the job to be printed with the deviation of the measured chromaticity value from the real chromaticity value. The color difference is used to compensate the job to be printed, which eliminates the problem of poor printing effect due to the color difference displayed on the monitor, and effectively improves the printing effect.

Description

Printing method and device for color compensation

technical field

The invention relates to the field of printing, in particular to a color compensation printing method and device.

Background technique

Before digital printing, the sample inspector compares the sample displayed on the monitor with the printed sample to judge whether the color effect seen in the image processing software of the sample is consistent with the printing effect.

If it is consistent, it can be printed; if it is inconsistent, if the color setting of the sample is correct, the color difference may be caused by the monitor. In this case, the monitor is usually corrected, and the color difference is re-judged, and then printed.

This printing method, because the display is an electronic product, after a certain period of use, there will be color distortion caused by aging. Even if it is corrected, there will be color difference, which will lead to a large deviation between the proofing result and the printing result, and ultimately lead to poor printing effect.

Contents of the invention

The present invention aims to provide a color compensation printing method and device to solve the above-mentioned problem of large deviation between the proofing result and the printing result due to the existence of color difference.

In an embodiment of the present invention, a color compensation printing method is provided, including:

Presenting a reference color patch with a true chromaticity value on the display; measuring the reference color patch on the display to obtain a measured chromaticity value; using the measured chromaticity value to compensate for the deviation of the true chromaticity value to be print job.

In an embodiment of the present invention, a color compensation printing device is provided, including: a display module, used to present a reference color block with a real chromaticity value on the display; a measurement module, used to measure the The reference color block is measured to obtain the measured chromaticity value; the compensation module is used to compensate the to-be-printed job with the deviation of the measured chromaticity value from the real chromaticity value.

Through the embodiment, the job to be printed is compensated by using the color difference, which eliminates the problem of large color deviation between the proofing result and the printing result due to the color difference displayed on the display, and effectively improves the printing effect.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 shows the flowchart of embodiment;

Fig. 2 shows the flow chart of calculating and compensating the color difference according to the color difference formula in the embodiment;

Fig. 3 shows a block diagram of the device structure in the embodiment.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. See Figure 1, including the following steps:

S11: Presenting the reference color patch with real chromaticity value on the display;

S12: Measure the reference color block on the display to obtain the measured chromaticity value;

S13: Compensate the job to be printed by using the deviation of the measured chromaticity value from the real chromaticity value.

Through the above steps, the color difference is used to compensate the job to be printed, which eliminates the problem of large color deviation between the proofing result and the printing result due to the color difference displayed on the monitor, and effectively improves the printing effect.

Referring to the flow chart of calculating and compensating the color difference according to the color difference formula in the embodiment shown in Figure 2, it includes the following steps:

S21: setting image processing software parameters;

Start the image processing software on the soft proofing device, such as PhotoShop software, and set related parameters including: working space setting and action setting. Set the corresponding printing ICC parameters in the workspace, and load the pre-made action files in the action settings. Among them, the printing ICC and action files mainly realize the transformation of subsequent reference color blocks into Lab mode based on the specified printing ICC. Soft proofing equipment is computer equipment with display performance suitable for printing and proofing requirements.

Among them, the working space setting is a set of ICC file settings (including RGB, CMYK, grayscale and spot color) used by PhotoShop software to process image files. PhotoShop uses these ICC files to convert the color values in the image file to the RGB color values displayed on the monitor.

Action setting is a sequence of image operation commands and parameters pre-recorded by users in PhotoShop, which is used to automatically execute a group of image operations in sequence. The external program can execute an action through the interface provided by PhotoShop to complete a certain function. Recorded actions can be exported as files to save. Action setting refers to loading the pre-recorded and exported action files into PhotoShop for calling.

In the embodiment, it is necessary to call a pre-recorded action file to complete the operation of converting the reference color block file from the CMYK color mode to the Lab color mode.

ICC files are color profile files used to convert between input color values and output color values.

After starting the PhotoShop software, open the color setting dialog box in the edit menu, and load the printing ICC file in CMYK in the working space.

Open the action dialog box in the window menu of PhotoShop software, and load the action file made in advance. It includes the operation of converting the reference color patch file from CMYK color mode to Lab color mode.

Connect the measuring device to the current computer, and click the whitening button to calibrate the measuring device.

Preferably, the EyeOnePro device is chosen to perform the measurements.

S22: call out the reference color block with real chromaticity value and display it on the display;

After the white calibration is completed, click the measurement button and follow the system prompts to hang the measuring device above the display of the soft proofing device, drive the PhotoShop software to open the pre-built reference color block file, and display it on the display. Position the reference patch displayed on the monitor with the measuring device.

S23: measure the chromaticity value of the reference color patch on the display;

The measuring device is driven to measure the light emitted by the reference color block in the display, and the measured chromaticity value of the current reference color block on the display is acquired and saved.

S24: Convert and save the color block mode;

Invoke the action of loading, and convert the color mode according to the printing ICC set in PhotoShop, that is, convert the reference color block of the original CMYK mode to Lab mode, and save the converted reference color block as a temporary file;

Since the color value measured by the measuring device EyeOnePro is in the Lab color mode, each color value contains three components, and the reference color block of the CMYK mode, each color value contains 4 components, it must also be converted into the Lab mode before it can be used The color difference formula calculates the color difference.

S25: Obtain the printing chromaticity value of the reference color block;

Read the temporary file, and then obtain and save the Lab value of the file, that is, the printing chromaticity value, which is also called the real chromaticity value in this application.

S26: whether there is a reference color block;

If the next reference color patch exists, execute S22; if not, execute S27; until all the reference color patches are measured.

S27: Calculate the deviation and compensate the job to be printed.

By measuring the measured chromaticity values of all reference color patches and the real chromaticity values (also known as printing chromaticity values) of the reference color patches, the deviation is calculated according to the color difference formula; and the maximum value of the deviation of these reference color patches is calculated, minimum, average, etc.

The printing operation is performed after compensating the pending printing job by the calculated offset.

Preferably, the color difference formula for calculating the deviation includes: CIE76 color difference formula, CIE94 color difference formula, CIE2000 color difference formula, and CMC color difference formula.

The deviation can be obtained by taking the real chromaticity value and the measured chromaticity value as input parameters and outputting through the above color formula.

For example: a real chromaticity in the reference color block is L=62, a=-45, b=-50, displayed on the display of the soft proofing device, and the measured chromaticity value obtained after measurement is L=61, a=- 42, b=-53. Using the CIE76 color difference calculation formula,

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;b</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

, to obtain the color difference ΔE=4.36 between the measured chromaticity value and the real chromaticity value. Similarly, the corresponding color difference can also be obtained according to other formulas.

Before printing the product, when the color of the printed product displayed on the comparison monitor is the same as the color of the sample, adjust the color of the printed product displayed on the monitor according to the deviation, for example, increase the color value, or decrease the color value. After the adjustments are complete, execute the print job.

In the printing process, according to the chromaticity value and color difference of the sample as parameters, the chromaticity value on the display can be obtained through the color difference formula. Use the obtained chroma values for printing on printing equipment.

Preferably, in order to avoid different color differences at various positions on the display of the soft proofing device, multiple color blocks can be set on the display, and each color block corresponds to an area on the display.

Referring to Fig. 3, an embodiment of the present invention also provides a printing device for color compensation, including:

A display module 31, configured to present a reference color patch with a true chromaticity value on a display;

A measurement module 32, configured to measure the reference color patch of the display module 31 on the display to obtain a measured chromaticity value;

The compensation module 33 is configured to compensate the job to be printed by using the deviation of the measured chromaticity value of the measurement module 32 from the real chromaticity value.

Through the above modules, the color difference is used to compensate for the job to be printed, which eliminates the problem of poor printing effect due to the color difference displayed on the display, and effectively improves the printing effect.

Preferably, the measurement module 32 drives the eyeonepro device to measure the color block to obtain the measured chromaticity value of the LAB mode;

The device also includes: a calibration module 34, used for calibration of the measurement device before the measurement by the measurement module 32.

Preferably, the chromaticity value of the reference color block in the device is the chromaticity value of the CMYK mode;

The device further includes: a conversion module 35 , configured to convert the chromaticity value of the reference color block in CMYK mode to LAB mode to obtain the real chromaticity value and provide it to the compensation module 33 .

Preferably, the device also includes:

The mapping module 36 is configured to establish a one-to-one correspondence between each of the reference color blocks displayed by the display module 31 and each area of the display.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by computing devices, thus, they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. the printing process of a color compensation, it is characterised in that including:

The reference color lump with true color value is presented on display；

Reference color lump on described display is measured and obtains measuring chromatic value；

With the deviation compensation operation to be printed to described true color value of the described measurement chromatic value, described with described measurement chromatic value, the deviation compensation operation to be printed of described true color value is included: present color value in the display with the printing that the deviation of described true color value is increased or decreased in operation to be printed by described measurement chromatic value.

Method the most according to claim 1, it is characterised in that use eyeonepro equipment that described color lump is measured, it is thus achieved that the measurement chromatic value of LAB pattern；

Also include: before described measurement, white to described measurement equipment school.

Method the most according to claim 2, it is characterised in that

The described chromatic value that chromatic value is CMYK pattern with reference to color lump；

Also include: the described chromatic value with reference to the CMYK pattern of color lump is transformed into LAB pattern, it is thus achieved that described true color value.

Method the most according to claim 1, it is characterised in that described deviation is determined by CIE76 colour difference formula, CIE94 colour difference formula, CIE2000 colour difference formula or CMC colour difference formula.

Method the most according to claim 1, it is characterised in that described is multiple with reference to color lump, regions multiple with described display one_to_one corresponding.

6. the printing equipment of a color compensation, it is characterised in that including:

Display module, for being presented to display by the reference color lump with true color value；

Measurement module, obtains measuring chromatic value for measuring the reference color lump on described display；

Compensating module, for with the deviation compensation operation to be printed to described true color value of the described measurement chromatic value, described with described measurement chromatic value, the deviation compensation operation to be printed of described true color value is included: present color value in the display with the printing that the deviation of described true color value is increased or decreased in operation to be printed by described measurement chromatic value.

Device the most according to claim 6, it is characterised in that described measurement module drives eyeonepro equipment to measure described color lump, it is thus achieved that the measurement chromatic value of LAB pattern；

Also include: the white module in school, for before described measurement, white to described measurement equipment school.

Device the most according to claim 7, it is characterised in that

The chromatic value that chromatic value is CMYK pattern of the reference color lump in described device；

Described device also includes: modular converter, for the described chromatic value with reference to the CMYK pattern of color lump is transformed into LAB pattern, it is thus achieved that described true color value.

Device the most according to claim 6, it is characterised in that also include:

Mapping block, for setting up each described one-to-one relationship with reference to color lump with the display regional of described printing equipment.