There are still so many ways to process the RGB data of Calendar printed manuscripts

There are still so many ways to process the RGB data of Calendar printed manuscripts

Nowadays, the processing of image data often does not consider the requirements related to printing, and directly converts from RGB to CMYK. In order to produce high-quality prints from a professional point of view, RGB data must be structured and CMYK data conversion methods most suitable for printing requirements are adopted.

1. RGB data processing

The so-called Calendar RGB data processing refers to the use of RGB data as the data of pre-press workers, and the conversion and adjustment of the data into data that can meet the requirements of CMYK printing. Specifically, it includes:

(1) CMYK conversion operation of RGB data;

(2) Calibration work (digital cameras, monitors, output devices, storage media, etc.);

(3) Image processing operations (color correction, image composition, tone transformation, image correction, etc.);

(4) Color management (predicting and judging output results based on digital data, etc.), etc.

In order to do RGB processing well, photographers, designers, plate-making companies, etc. need to distinguish their respective responsibilities, and formulate RGB data processing standards accordingly. Clear conversion rules are important printing techniques.

The pre-press company should set up a department to check foreign RGB digital manuscripts, so that appropriate materials can be transferred to the next process as required.

2. The necessity of RGB workflow

In order to realize the processing of RGB Calendar data, it is necessary to construct a workflow corresponding to RGB image data. Now that the number of RGB originals of digital cameras is increasing, this need must be met.

Through the realization of RGB workflow, the responsibility and workload of photographers, designers, etc. can be reduced, and the occurrence of quality accidents can be reduced. In addition, shortening of delivery time and cost reduction can be achieved. If the image data is made into a database, in addition to improving the work efficiency, the image data can be reused.

3. Benchmarking of RGB workflows

In order to build an RGB workflow, the collaboration of the employer who provided the manuscript is necessary, so it is important to propose a benchmark, and the following are specific examples.

(1) Requirements for photographers

Use photoshop 6.0 or later;

The monitor 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 submit it to the prepress company in RAW data format;

Set the image resolution to 350dpi;

Provide data content records (photographer, software used, color space, resolution, whether to sharpen, etc.);

When the printing size is A4 size, 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 a number of more than 12 million pixels.

(2) Requirements for designers

The monitor must be calibrated;

Do not convert RGB image data to CMYK data;

The color correction and color management of the image are done by the prepress company;

The layout design of continuous spelling and big printing is done by the prepress company.

4. Professional CMYK conversion

For CMYK conversion, you must change the color settings according to the graphics. The conversion job itself is very simple, and it is originally a question of "how to convert to obtain high quality in order to reproduce the desired color", but this is a professional technical problem. In order to reproduce the color close to the RGB image, density adjustment and gradation adjustment are required, and skills are performed in the CMYK color space to obtain the desired color. Examples of key points to obtain high-quality color reproduction are:

(1) While adjusting the generation of the black version, carry out the conversion operation (making it possible to print clear black version text, adjust the gray balance, approach the color of the original, pursue the details, etc.);

(2) Since sometimes the printing plate is inaccurate, it is necessary to carry out trapping processing (to make the background color less conspicuous). In the second point, when the image data or background has layers, it is quite difficult to prevent the printing plate from being inaccurate, and skilled technology is required. This kind of work can be said to be a professional work.