The so-called RGB data processing refers to the use of RGB data as data for pre-press workers, and the data is converted and adjusted to meet the CMYK printing data. Specifically include:
(1) CMYK conversion operation of RGB data;
(2) Calibration operations (digital cameras, monitors, output devices, storage media, etc.);
(3) Image processing operations (color correction, image synthesis, tone conversion, image correction, etc.);
(4) Color management (based on digital data to predict the output, etc.), etc.
In order to do RGB processing well, photographers, designers, plate-making companies, etc. need to clarify their respective responsibilities and formulate RGB data processing standards accordingly. It is important to clarify the conversion rules.
The pre-press company should set up a department to check the external RGB digital manuscript in order to transfer the appropriate information to the next process as required.
2. The necessity of RGB workflow
In order to realize the processing of RGB data, the workflow corresponding to the RGB image data must be constructed. Now that the number of RGB manuscripts in digital cameras has increased, it must meet this need.
Through the realization of RGB workflow, the responsibility and workload of photographers and designers can be reduced, and the occurrence of quality accidents can be reduced. In addition, it can also shorten the delivery time and reduce costs. If the image data is made into a database, in addition to improving the operation efficiency, the image data can be used again.
3. Benchmarking of RGB workflow
In order to construct the RGB workflow, the cooperation of employers who provide manuscripts is required. Therefore, it is important to propose a benchmark. The following are specific examples.
(1) Requirements for photographers
* Use photoshop 6.0 or above;
* The display must be calibrated;
* Those who do not convert RGB image data into CMYK data;
* If you need to make major changes to the color, please give it to the prepress company in RAW data format;
* Set the resolution of the image to 350dpi;
* Provide data content records (photographer, software used, color space, resolution, sharpening, etc.);
* When the printing size is A4 specification, use a camera with more than 6 million pixels for photography;
* For prints with high quality requirements such as skin photography, it is required to use a camera with more than 12 million images.
(2) Requirements for designers
* The display must be calibrated;
* Do not convert RGB image data to CMYK data;
* The color correction and color management of the image are handed over to the prepress company;
* The layout design of LianPin, DaPei, etc. is handed over to the prepress company.
4. CMYK conversion from a professional perspective
For CMYK conversion, you must change the color settings made according to the graphics. The conversion job itself is very simple, and it was originally a question of "how to convert to obtain high quality in order to reproduce the desired color", but this is a professional technical issue. In order to reproduce the color close to the RGB image, density adjustment and gradation adjustment are required, and techniques are performed in the range of CMYK color space to obtain the required color. Examples of key points to obtain high-quality color reproduction are as follows:
(1) While adjusting the generation of the black version, carry out the conversion operation (making clear black version text printing, gray balance adjustment, close to the original color, pursuit of details, etc. possible);
(2) Since the problem of inaccurate plate set-up sometimes occurs, trapping treatment (to make the background color less conspicuous) is necessary. In the case where the image data or the background in the second point has a layer, it is quite difficult to prevent the printing plate from being inaccurate, and requires a skilled technique. Such a job can be said to be a professional job.
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