In recent years, due to the development of digital printing, people have the impression that the color of printed matter is not as strict as it used to be. From the perspective of the printer, the colors that could have been satisfactorily made can't be reproduced. Although there may be reasons for the lower cost of the employer and the technical conditions of the plate making and printing companies, there is also a reason that the printing workers may also pessimistically believe that the problem cannot be solved because of the digital technology.
The processing of image data is now often less concerned with printing-related requirements, converting directly from RGB to CMYK. In order to produce high-quality prints from a professional perspective, it is necessary to construct an RGB data workflow and use the CMYK data conversion method that is most suitable for printing requirements.
Past plate making technology is a technology that requires long-term accumulation. For example, in order to reproduce the bright part of the skin, the Japanese skin takes M15% and Y20%, while the Europeans and Americans take M20%, and the white light on the eyeball is taken out of the net.
Even today, when digitalization has been implemented in the process, it is necessary to make good use of the accumulated technology to perform correct RGB-CMYK data conversion to achieve high-quality printing requirements.
1 RGB data processing
The so-called RGB data processing refers to the use of RGB data as the data of the prepress worker, and the data conversion is adjusted to meet the data for CMYK printing. Specifically, it includes: 1). CMYK conversion operation of RGB data; 2). Calibration operation (digital camera, display, output device, storage medium, etc.); 3). Image processing operation (color correction, image synthesis, tone conversion, Image correction, etc.); 4). Color management (predicting output results based on digital data predictions, etc.), and so on.
In order to do RGB processing, photographers, designers, and plate-making companies are required to distinguish their respective responsibilities, and accordingly, standards for RGB data processing are established. It is important to clarify the conversion rules.
Prepress companies should set up departments that inspect foreign RGB digital manuscripts in order to transfer appropriate data to the next process as required.
2 The need for RGB workflow
In order to realize the processing of RGB data, it is necessary to construct a workflow corresponding to RGB image data, and it is necessary to satisfy this requirement in the current increase in RGB originals of digital cameras.
Through the implementation of the RGB workflow, the responsibility and workload of photographers, designers, etc. can be reduced, and the occurrence of quality accidents can be reduced. In addition, the shortening of delivery and the reduction of cost can be achieved. If the image data is made into a database, in addition to improving the work efficiency, the image data can be used twice.
3 RGB workflow benchmarking
In order to construct an RGB workflow, collaboration with the employer of the manuscript is required. Therefore, it is important to propose a benchmark. The following are specific examples.
1). Requirements for photographers
Use photoshop6.0 or higher version of the display must be calibrated without converting RGB image data into CMYK data. If you need to make major changes to the color, please submit it to the prepress company in RAW data format to set the image resolution to 350dpi.
Provide data content records (photographer, software, color space, resolution, sharpening, etc.)
When the printing size is A4, it is necessary to use a camera with a picture size of 6 million or more. For high-quality prints such as skin photography, it is required to use a camera with a camera number of 12 million or more.
2). Requirements for designers
The display must be calibrated. The color correction and color management of the RGB image data are not converted into CMYK data images. The layout design of the pre-press company to complete the fight, the layout, etc. is completed by the prepress company.
4 professional perspective CMYK conversion
For CMYK conversion, you must change the color settings made according to the text. The conversion job itself is very simple. It was originally a question of "how to convert the desired color to achieve high quality", but this is a professional technical problem. In order to reproduce colors that are close to RGB images, density adjustments and gradation adjustments are required to perform techniques in the CMYK color space to achieve the desired color. Examples of points for obtaining high-quality color reproduction are as follows:
1. Performing conversion work while adjusting the black version generation (making clear black text printing, gray balance adjustment, close to original color, detail pursuit, etc.);
2. Since the problem of inaccurate printing plate sometimes occurs, it is necessary to perform trapping processing (to make the background color less conspicuous).
In the case where the image data or the background of the second point has a level, it is quite difficult to prevent the printing plate from being inaccurate, and a skilled technique is required. Such work can be said to be a professional job.
In recent years, due to the development of digital printing, people have the impression that the color of printed matter is not as strict as it used to be. From the perspective of the printer, the colors that could have been satisfactorily made can't be reproduced. Although there may be reasons for the lower cost of the employer and the technical conditions of the plate making and printing companies, there is also a reason that the printing workers may also pessimistically believe that the problem cannot be solved because of the digital technology.
The processing of image data is now often less concerned with printing-related requirements, converting directly from RGB to CMYK. In order to produce high-quality prints from a professional perspective, it is necessary to construct an RGB data workflow and use the CMYK data conversion method that is most suitable for printing requirements.
Past plate making technology is a technology that requires long-term accumulation. For example, in order to reproduce the bright part of the skin, the Japanese skin takes M15% and Y20%, while the Europeans and Americans take M20%, and the white light on the eyeball is taken out of the net.
Even today, when digitalization has been implemented in the process, it is necessary to make good use of the accumulated technology to perform correct RGB-CMYK data conversion to achieve high-quality printing requirements.
1 RGB data processing
The so-called RGB data processing refers to the use of RGB data as the data of the prepress worker, and the data conversion is adjusted to meet the data for CMYK printing. Specifically, it includes: 1). CMYK conversion operation of RGB data; 2). Calibration operation (digital camera, display, output device, storage medium, etc.); 3). Image processing operation (color correction, image synthesis, tone conversion, Image correction, etc.); 4). Color management (predicting output results based on digital data predictions, etc.), and so on.
In order to do RGB processing, photographers, designers, and plate-making companies are required to distinguish their respective responsibilities, and accordingly, standards for RGB data processing are established. It is important to clarify the conversion rules.
Prepress companies should set up departments that inspect foreign RGB digital manuscripts in order to transfer appropriate data to the next process as required.
2 The need for RGB workflow
In order to realize the processing of RGB data, it is necessary to construct a workflow corresponding to RGB image data, and it is necessary to satisfy this requirement in the current increase in RGB originals of digital cameras.
Through the implementation of the RGB workflow, the responsibility and workload of photographers, designers, etc. can be reduced, and the occurrence of quality accidents can be reduced. In addition, the shortening of delivery and the reduction of cost can be achieved. If the image data is made into a database, in addition to improving the work efficiency, the image data can be used twice.
3 RGB workflow benchmarking
In order to construct an RGB workflow, collaboration with the employer of the manuscript is required. Therefore, it is important to propose a benchmark. The following are specific examples.
1). Requirements for photographers
Use photoshop6.0 or higher version of the display must be calibrated without converting RGB image data into CMYK data. If you need to make major changes to the color, please submit it to the prepress company in RAW data format to set the image resolution to 350dpi.
Provide data content records (photographer, software, color space, resolution, sharpening, etc.)
When the printing size is A4, it is necessary to use a camera with a picture size of 6 million or more. For high-quality prints such as skin photography, it is required to use a camera with a camera number of 12 million or more.
2). Requirements for designers
The display must be calibrated. The color correction and color management of the RGB image data are not converted into CMYK data images. The layout design of the pre-press company to complete the fight, the layout, etc. is completed by the prepress company.
4 professional perspective CMYK conversion
For CMYK conversion, you must change the color settings made according to the text. The conversion job itself is very simple. It was originally a question of "how to convert the desired color to achieve high quality", but this is a professional technical problem. In order to reproduce colors that are close to RGB images, density adjustments and gradation adjustments are required to perform techniques in the CMYK color space to achieve the desired color. Examples of points for obtaining high-quality color reproduction are as follows:
1. Performing conversion work while adjusting the black version generation (making clear black text printing, gray balance adjustment, close to original color, detail pursuit, etc.);
2. Since the problem of inaccurate printing plate sometimes occurs, it is necessary to perform trapping processing (to make the background color less conspicuous).
In the case where the image data or the background of the second point has a level, it is quite difficult to prevent the printing plate from being inaccurate, and a skilled technique is required. Such work can be said to be a professional job.
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