CN114185498A - Ancient painting and calligraphy copying and toning method - Google Patents
Ancient painting and calligraphy copying and toning method Download PDFInfo
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- CN114185498A CN114185498A CN202111486545.4A CN202111486545A CN114185498A CN 114185498 A CN114185498 A CN 114185498A CN 202111486545 A CN202111486545 A CN 202111486545A CN 114185498 A CN114185498 A CN 114185498A
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- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
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Abstract
The application relates to an ancient painting and calligraphy copying toning method, which belongs to the technical field of painting and calligraphy copying, and comprises the following steps of 1, obtaining a scanned image of a painting and calligraphy original manuscript; step 2, carrying out global adjustment in a preset mode on the scanned image to obtain an intermediate image; step 3, printing and outputting the intermediate image to obtain a comparison sample; step 4, determining the color difference value between the intermediate image and the comparison sample based on the measurement of a color difference meter; step 5, comparing the color difference value with a preset threshold value, performing reverse color adjustment on the intermediate image when the color difference value is greater than or equal to the preset threshold value, taking the adjusted image as a new intermediate image, and skipping to the step 3, otherwise, storing the intermediate image as a final image file after color adjustment is completed, and performing the step 6; and 6, printing and outputting the final image file. The method of the application adopts a specific mode to carry out copying and color matching, and is beneficial to reducing the difference between the copy and the original.
Description
Technical Field
The application belongs to the technical field of painting and calligraphy copying, and particularly relates to an ancient painting and calligraphy copying and toning method.
Background
The ancient Chinese painting and calligraphy are typical representatives of the traditional Chinese culture and have a long history. The classic famous works of the ancient Chinese painting and calligraphy are mostly collected in the world-Bo institution at present, and the true appearances of the original works are rarely seen by the public. In order to carry forward Chinese painting and calligraphy culture, the ancient painting and calligraphy needs to be restored and copied by means of modern technology, on one hand, the ancient painting and calligraphy can replace original relics to be displayed, and on the other hand, the ancient painting and calligraphy can be appreciated by people by purchasing the duplicates at low cost.
In the related technology, the existing painting and calligraphy copying technology lacks a systematic and normalized copying toning method, and large errors exist between copies and original works in the market. Particularly in terms of color, there are problems such as white field drift, loss of color gradation, dark field gradation coincidence, bluing of ink tone, and the like.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
In order to overcome the problems in the related technology at least to a certain extent, the application provides an ancient painting and calligraphy copying and toning method, which is based on a computer and a modern image processing technology and adopts a specific mode to copy and tone so as to be beneficial to reducing the difference between a copy product and an original product.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the application provides an ancient painting and calligraphy copying and toning method, which comprises the following steps:
step 1, obtaining a scanned image of a painting and calligraphy original;
step 2, carrying out global adjustment in a preset mode on the scanned image to obtain an intermediate image;
step 3, printing and outputting the intermediate image to obtain a comparison sample;
step 4, determining the color difference value between the intermediate image and the comparison sample based on the measurement of a color difference meter;
step 5, comparing the color difference value with a preset threshold value,
when the color difference value is larger than or equal to a preset threshold value, carrying out reverse color adjustment on the intermediate image, taking the adjusted image as a new intermediate image, and skipping to carry out the step 3,
otherwise, saving the intermediate image as a final image file after color matching is finished, and performing the step 6;
and 6, printing and outputting the final image file.
Optionally, the process of acquiring a scanned image of a document includes:
and configuring a standard light source to illuminate the scanning platform, scanning the painting and calligraphy original manuscript arranged on the scanning platform through a real object scanner, and storing the obtained scanning data into a digital image file without a compressed format to obtain the scanned image.
Optionally, the performing global adjustment on the scanned image in a predetermined manner includes:
under the Adobe RGB color space, the following adjustment settings are performed on the scanned image:
setting the brightest color in the gray axis data as R253G 251B 245;
setting the darkest color in the gray axis data to R20G 20B 20;
setting the first gray tone in the gray axis data to R128G 128B 128;
the second gray tone in the gray axis data is set to R192G 192B 192.
Optionally, the process of determining a color difference value between the intermediate image and the comparison sample based on the colorimeter measurement includes:
determining a representative color region in the intermediate image;
for each typical color region, the following steps are respectively carried out:
the typical color area in the intermediate image is determined based on colorimeter measurements, and the color difference value between the area in the comparison sample corresponding to the typical color area is determined.
Alternatively, the representative color region refers to a patch region having an area ratio exceeding a predetermined value in the image picture.
Optionally, the typical color region refers to a color block region of a default pigment color in the image picture, wherein the default pigment color includes cinnabar, gamboge and cyanine.
Optionally, when the color difference value is greater than or equal to a preset threshold, performing color reverse adjustment on the intermediate image, specifically:
and performing reverse adjustment on the deviation brightness, the saturation and the hue of the typical color area with the color difference value larger than or equal to the preset threshold value.
Optionally, after step 2 and before step 3, further comprising:
and performing color pre-correction processing on each color block region in the intermediate image based on a preset color parameter value, and taking the processed image as a new intermediate image.
Optionally, printing the final image file includes:
and performing color management configuration and printing material characteristic configuration on the image printing equipment, and printing the final image file based on the configured image printing equipment.
This application adopts above technical scheme, possesses following beneficial effect at least:
according to the technical scheme, the image color adjustment from the image acquisition to the output of the copy is carried out by means of a computer graphic image technology. By adopting the full-digital process, the problems of subjectivity and deviation from the original copy of the copy caused by the traditional manual copy can be effectively avoided. And based on the specific flow steps, the color deviation problem in the copying process can be effectively avoided.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
FIG. 1 is a schematic flow chart of a method for copying and toning ancient painting and calligraphy according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for copying and toning ancient painting and calligraphy according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
As mentioned in the background, ancient Chinese painting and calligraphy are typical representatives of the traditional culture of China and have a long history. The classic famous works of the ancient Chinese painting and calligraphy are mostly collected in the world-Bo institution at present, and the true appearances of the original works are rarely seen by the public. In order to carry forward Chinese painting and calligraphy culture, the ancient painting and calligraphy needs to be restored and copied by means of modern technology, on one hand, the ancient painting and calligraphy can replace original relics to be displayed, and on the other hand, the ancient painting and calligraphy can be appreciated by people by purchasing the duplicates at low cost.
In the related technology, the existing painting and calligraphy copying technology lacks a systematic and normalized copying toning method, and large errors exist between copies and original works in the market. Particularly in terms of color, there are problems such as white field drift, loss of color gradation, dark field gradation coincidence, bluing of ink tone, and the like.
In view of the above, the application provides an ancient painting and calligraphy copying and toning method, which is based on a computer and a modern image processing technology and adopts a specific mode to copy and tone so as to be beneficial to reducing the difference between a copy and an original.
In one embodiment, as shown in fig. 1, the ancient painting and calligraphy copying toning method proposed by the present application includes the following steps:
step 1, obtaining a scanned image of a painting and calligraphy original;
for example, a document may be scanned by a document scanner to obtain a scanned image of the document, and it is easy to understand that the scanned image is a digital file carrying image information.
Step 2, carrying out global adjustment in a preset mode on the scanning image obtained in the step 1 to obtain an intermediate image;
in the step, a professional image processing tool software (such as Photoshop software) is adopted to carry out global adjustment on a scanned image to obtain an intermediate image; for example, the global adjustment here includes setting paper color, adjusting gray axis, and the like in a large color gamut space.
Step 3, printing and outputting the obtained intermediate image to obtain a comparison sample;
in this step, the intermediate image is subjected to entity printing output, so as to obtain a printed product for subsequent comparison and color matching, and the printed product is referred to as a comparison sample in the application.
Step 4, determining the color difference value between the intermediate image and the comparison sample based on the measurement of a color difference meter;
the color difference meter is used for measuring the color difference value between the intermediate image and the comparison sample, namely measuring the color difference value of a corresponding position area between the intermediate image and the comparison sample; it is easy to understand that, here, the chroma information of the sample is obtained by comparing and directly measuring with an instrument, and the chroma information of the intermediate image is obtained by reading from a digital file containing the intermediate image, inputting the read chroma information into a color difference meter, and the color difference meter compares and calculates the chroma information with the chroma information obtained by measuring and correspondingly outputs the data of the color difference value.
As shown in fig. 1, the color difference value is compared with a preset threshold value at step 5,
when the color difference value is larger than or equal to a preset threshold (for example, the preset threshold is 5), performing color reverse adjustment on the intermediate image, taking the adjusted image as a new intermediate image, and skipping to perform step 3,
otherwise, the intermediate image is saved as the final image file with finished color matching, and step 6 is performed.
It should be noted that, since the color difference values obtained in step 4 are generally multiple (corresponding to different regions), the comparison in step 5 is also performed separately; the rule for jumping can be adjusted based on the actual rule;
in this embodiment, to ensure the final effect, as long as one color difference value is greater than or equal to the preset threshold, the corresponding color reverse adjustment is performed, and the step 3 is skipped, and the step 6 is skipped when all color difference values are less than the preset threshold;
in addition, it is easy to understand that the color reverse adjustment here refers to performing a specific color matching operation on the intermediate image by using image processing tool software to achieve the effect of reducing the color difference value.
And 6, printing and outputting the final image file.
In the step, the final image file with the color difference value meeting the requirement is printed and output, and then a copy of the original of the painting and calligraphy can be obtained; it is easy to understand that in this step, color management configuration and printing material property configuration are required to be performed on the image printing apparatus, and the final image file is printed based on the configured image printing apparatus.
According to the technical scheme, the image color adjustment from the image acquisition to the output of the copy is carried out by means of a computer graphic image technology. By adopting the full-digital process, the problems of subjectivity and deviation from the original copy of the copy caused by the traditional manual copy can be effectively avoided. And based on the specific flow steps, the color deviation problem in the copying process can be effectively avoided.
To facilitate understanding of the technical solutions of the present application, the technical solutions of the present application will be described below with reference to another embodiment.
As shown in fig. 2, in this embodiment, the ancient painting and calligraphy copying and toning method proposed by the present application includes the following steps:
step 21, obtaining a scanned image of a painting and calligraphy original;
in this embodiment, a germany ultra high definition document scanner CRUS is used to scan a document, and the scanning process includes:
configuring a standard light source (the standard light source is a light source which accords with the image scanning light source standard specified by the international lighting commission in terms of illumination, color temperature and color rendering index, generally speaking, an LED light source carried by a scanner is adopted) to illuminate the scanning platform, opening a suction device of the scanning platform to ensure that a painting and calligraphy original placed on the scanning platform is flatly unfolded,
scanning a painting and calligraphy original document placed on a scanning platform by a real object scanner (in practical operation, the focal distance between a scanning lens and the original document needs to be kept consistent, scanning is carried out in a line-by-line point-by-point scanning mode, the scanning acquisition resolution cannot be too low, and if the scanning acquisition resolution is more than or equal to 600dpi), and the obtained scanning data is stored into a digital image file (such as TIFF format) without a compression format to obtain a scanning image.
In addition, in order to prevent the stray light from interfering with the scanning process, the scanning place needs to be a light-shielding place.
Then, step 22 is carried out, global adjustment in a preset mode is carried out on the scanning image obtained in the step 21, and an intermediate image is obtained;
in the step, Photoshop software is adopted to carry out global adjustment on a scanned image to obtain an intermediate image; for example, the global adjustment here includes setting paper color, adjusting gray axis data, and the like in a large color gamut space.
Specifically, in the actual operation, a digital file of the intermediate image is opened through Photoshop software, and is configured into an Adobe RGB color space, so that in the Adobe RGB color space, the following adjustment setting is performed on the scanned image by using a color level and curve tool in the software (it should be noted that, the operation adjustment is performed strictly according to the following sequence):
the brightest color (generally referred to as the paper color in the context of this application) in the gray axis data is set to R253G 251B 245;
the darkest color in the gray axis data (commonly referred to as the caramel color in the context of this application) is set to R20G 20B 20;
the first gray tone in the gray axis data (generally referred to as the intermediate ink color in the context of this application) is set to R128G 128B 128;
the second gray tone (commonly referred to as a light ink color in the context of this application) in the gray axis data is set to R192G 192B 192.
Then, step 23, printing and outputting the obtained intermediate image to obtain a comparison sample;
then, step 24 is carried out, and the color difference value between the intermediate image and the comparison sample piece is determined based on the measurement of the color difference meter; specifically, the process of determining the color difference value between the intermediate image and the comparison sample based on the colorimeter measurement includes:
determining a representative color region in the intermediate image;
for each typical color region, the following steps are respectively carried out:
the typical color area in the intermediate image is determined based on colorimeter measurements, and the color difference value between the area in the comparison sample corresponding to the typical color area is determined.
It should be noted that the typical color region is a color-mixing target region determined for balancing the overall scheme efficiency and effect. The typical color in the present application includes two layers, one is a color whose ratio of color area in the picture exceeds a predetermined value, which can be estimated by visual observation without performing strict actual measurement in consideration of efficiency, and the other is a pigment color commonly used in traditional Chinese painting, such as cinnabar, gamboge, cyanine, etc., which has a high sensitivity to these inherent colors and therefore needs to be used as a color matching target.
Accordingly, the typical color region in this step refers to a color block region having an area ratio exceeding a predetermined value (e.g., exceeding 10%) in the image frame, or refers to a color block region of a predetermined pigment color in the image frame, where the predetermined pigment color includes cinnabar, gamboge, cyanine, and the like.
After step 24, step 25 is performed to compare the color difference value with a preset threshold value,
when the color difference value is larger than or equal to a preset threshold (for example, the preset threshold is 5), performing color reverse adjustment on the intermediate image, taking the adjusted image as a new intermediate image, and skipping to perform step 3,
otherwise, the intermediate image is saved as the final image file with finished color matching, and step 6 is performed.
It should be noted that, since the color difference values obtained in step 24 are generally plural (corresponding to different typical color regions), the comparison in step 25 is also performed separately;
in this embodiment, to ensure the final effect, if there is a color difference value greater than or equal to the preset threshold, the corresponding color reverse adjustment is performed, and the step 23 is skipped, and the step 26 is skipped when all the color difference values are less than the preset threshold;
in addition, it is easy to understand that the color reverse adjustment here refers to performing a specific color matching operation on the intermediate image by using image processing tool software to achieve the effect of reducing the color difference value.
Specifically, for a typical color region with a color difference value greater than or equal to a preset threshold, a tool software (Photoshop in this embodiment) is used to perform inverse adjustment in terms of deviation brightness, saturation, and hue.
And finally, step 6, printing and outputting the final image file.
Similarly, in this step, it is necessary to perform color management configuration and print material characteristic configuration for the image printing apparatus, and print the final image file based on the configured image printing apparatus.
In actual operation, firstly, a printing command is executed in the image processing software, and printing setting is carried out when a dialog box is popped up, wherein the method comprises the following aspects: selecting a printer name, selecting a printing material, setting a printing size and an arrangement mode, closing a color configuration of a printing driver, setting printing precision, managing colors by using Photoshop, selecting a printing material characteristic file (the material characteristic file is constructed based on the requirement presetting, and a professional payment color management software and a professional spectrophotometer are required for manufacturing the material characteristic file), and after all the settings are finished, executing printing to obtain a final copy of the painting and calligraphy original.
In addition, in order to further improve the efficiency of the overall scheme, as a preferred embodiment, as shown in fig. 2, after step 22 and before step 23, the method further includes:
and step 22a, performing color pre-correction processing on each color block region in the intermediate image based on a preset color parameter value, and taking the processed image as a new intermediate image.
In the step, the preset color parameter value is a unique color parameter value formed by a plurality of tests and improvements based on a large amount of Chinese painting copying and toning operations of an applicant, and belongs to a Chinese painting color standard parameter value (empirical value) summarized, the intermediate image is matched in an RGB range based on the color parameter value, then color pre-correction processing similar to matching revision (adjustment to a color reference value) is carried out, and the processed image is used as a new intermediate image to print a comparison sample, so that the frequency of carrying out subsequent comparison toning can be effectively reduced, and the efficiency of copying toning is integrally improved.
The technical scheme of the application mainly has bright spots in the following aspects:
(1) and a full digitalization process. The original painting and calligraphy copy mainly depends on manual copying, is developed by combining manpower and skills, and the copied works have certain subjectivity and deviation with the original works. The method of the application, from image acquisition to image color modulation and then to output copy, is all full digital operation by means of computer graphic image technology. The method has strong scientificity and accuracy, and can objectively reflect the visual effect of the works.
(2) And the color can be produced in a non-deviation and quantitative manner. On the basis of digitalization, the same image master mask can output finished products in batches without deviation through color management control, so that the copying efficiency is improved, and the copying time cost is reduced.
(3) The color space conversion is natural and smooth, the color information collected from the original work can be kept to the maximum extent without loss and compression, the lightness, hue and saturation of the color of the work can be accurately presented, the work is natural, and the high visual matching with the original work can be achieved.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An ancient painting and calligraphy copying and toning method is characterized by comprising the following steps:
step 1, obtaining a scanned image of a painting and calligraphy original;
step 2, carrying out global adjustment in a preset mode on the scanned image to obtain an intermediate image;
step 3, printing and outputting the intermediate image to obtain a comparison sample;
step 4, determining the color difference value between the intermediate image and the comparison sample based on the measurement of a color difference meter;
step 5, comparing the color difference value with a preset threshold value,
when the color difference value is larger than or equal to a preset threshold value, carrying out reverse color adjustment on the intermediate image, taking the adjusted image as a new intermediate image, and skipping to carry out the step 3,
otherwise, saving the intermediate image as a final image file after color matching is finished, and performing the step 6;
and 6, printing and outputting the final image file.
2. The method of claim 1, wherein the process of obtaining a scanned image of a document comprises:
and configuring a standard light source to illuminate the scanning platform, scanning the painting and calligraphy original manuscript arranged on the scanning platform through a real object scanner, and storing the obtained scanning data into a digital image file without a compressed format to obtain the scanned image.
3. The method of claim 1, wherein the globally adjusting the scan image in a predetermined manner comprises:
under the Adobe RGB color space, the following adjustment settings are performed on the scanned image:
setting the brightest color in the gray axis data as R253G 251B 245;
setting the darkest color in the gray axis data to R20G 20B 20;
setting the first gray tone in the gray axis data to R128G 128B 128;
the second gray tone in the gray axis data is set to R192G 192B 192.
4. The method of claim 1, wherein determining the color difference value between the intermediate image and the comparison sample based on colorimeter measurements comprises:
determining a representative color region in the intermediate image;
for each typical color region, the following steps are respectively carried out:
the typical color area in the intermediate image is determined based on colorimeter measurements, and the color difference value between the area in the comparison sample corresponding to the typical color area is determined.
5. The method according to claim 4, wherein the representative color region refers to a patch region having an area ratio exceeding a predetermined value in an image picture.
6. The method according to claim 4, wherein the typical color region refers to a color block region of a default pigment color in the image frame, wherein the default pigment color comprises cinnabar, gamboge and cyanine.
7. The method according to claim 4, wherein when the color difference value is greater than or equal to a preset threshold, performing color reverse adjustment on the intermediate image, specifically:
and performing reverse adjustment on the deviation brightness, the saturation and the hue of the typical color area with the color difference value larger than or equal to the preset threshold value.
8. The method of claim 4, after step 2 and before step 3, further comprising:
and performing color pre-correction processing on each color block region in the intermediate image based on a preset color parameter value, and taking the processed image as a new intermediate image.
9. The method of claim 1, wherein printing the final image file comprises:
and performing color management configuration and printing material characteristic configuration on the image printing equipment, and printing the final image file based on the configured image printing equipment.
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