Printed original RGB data processing has so many doorways

Nowadays, the processing of image data often does not take into account the requirements related to printing, and directly converts from RGB to CMYK. In order to produce high-quality prints from a professional perspective, it is necessary to construct RGB data and use the CMYK data conversion method that is most suitable for printing requirements.

1.RGB data processing

The so-called RGB data processing refers to the use of RGB data as a prepress worker's data, and the data is converted and adjusted to meet the CMYK printing materials. Specifically, it includes:

(1) CMYK conversion operation of RGB data;

(2) Calibration operations (digital cameras, displays, output devices, storage media, etc.);

(3) image processing operations (color correction, image synthesis, tone conversion, image correction, etc.);

(4) Color management (predicting output results based on digital data prediction, 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. Clear conversion rules are important printing techniques.

Prepress companies should set up departments that inspect foreign RGB digital originals 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, it is necessary to construct a workflow corresponding to the RGB image data, and the need for this in the digital camera RGB manuscript must be met.

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. Benchmarking of RGB workflow

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 above;

The display must be calibrated;

Not 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;

Set the resolution of the image to 350dpi;

Provide data content records (photographers, software, color space, resolution, sharpening, etc.);

When the printing size is A4, use a camera with a camera number of 6 million or more;

For prints with high quality requirements such as skin photography, camera photography with more than 12 million pixels is required.

(2) Requirements for designers

*The display must be calibrated;

* Do not convert RGB image data into CMYK data;

* Image color correction and color management are handled by the prepress company;

* The layout of the fight, the big version, etc. is handed over to the prepress company.

4. Professional perspective CMYK conversion

For CMYK conversion, (China Golden Packet Network is the portal of the printing iron can industry) must change the color settings according to the text. The conversion job itself is very simple. It was originally a question of "how to convert the desired color and how to convert it to 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 the conversion operation while adjusting the black version generation (making clear black text printing, gray balance adjustment, close to the original color, and the pursuit of details);

(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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