How To Do Chocolate Boxes For Gifts Prepress Platemaking RGB Data Processing

How to do Chocolate Boxes For Gifts prepress platemaking RGB data processing

 

At present, the processing of image data often does not consider the requirements related to printing, directly converted from RGB to CMYK. In order to produce high quality prints from a professional perspective, it is necessary to structure the RGB data workflow and use the CMYK data conversion method most suitable for printing requirements.

 

The previous plate-making technology is a kind of long-term accumulation of technology. For example, in order to reproduce the bright part of the skin, M15% and Y20% are taken for Japanese skin, and M20% is taken for European and American people, and the white part of the eye is taken out of the net. Even today, when the process has been digitized, it is necessary to make good use of the accumulated technologies in the past for correct RGB-CMYK data conversion to achieve high quality printing requirements.

 

1.RGB data processing

The so-called RGB data processing refers to using RGB data as the data of prepress workers, and converting and adjusting the data to meet the requirements of CMYK printing data. 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 transformation, image correction, etc.);

 

(4) Color management (predict and judge the output results according to digital data, etc.), etc.

 

In order to do a good job of RGB processing, it is necessary for photographers, designers, plate companies, etc. to distinguish their responsibilities, according to the development of RGB data processing standards. It is important to clarify the transformation rules.

 

The prepress company should set up a unit to examine foreign RGB digit originals so that appropriate data can be transferred to the next process as required.

 

2. Necessity of RGB workflow

In order to realize the processing of RGB data, it is necessary to build a workflow corresponding to the RGB image data. With the increasing number of RGB originals in digital cameras, this need must be met. 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, the delivery time can be shortened and the cost can be reduced. If the image data is made into a database, it can not only improve the working efficiency, but also make use of the image data twice. [next]

 

3. Benchmark formulation of RGB workflow

In order to construct an RGB workflow, the collaboration of the employer that provided the original is required, so it is important to come up with benchmarks. Here are specific examples.

 

(1) Requirements for photographers

* Use photoshop6.0 or above;

 

* The display must be calibrated;

 

* Do not convert RGB image data to CMYK data;

 

* If you need to make major color changes, please submit to the prepress company in RAW data format;

 

* Set the image resolution to 350dpi;

 

* Provide a record of the data content (by photographer, software used, color space, resolution, whether it is sharpened, etc.);

 

* When the printing size is A4, camera photography with more than 6 million images is used;

 

* For high-quality prints such as skin photography, camera photography with more than 12 million images is required.

 

(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 is handled by the prepress company;

 

* The layout design of the joint and large version is handed over to the prepress company.

 

4. CMYK conversion from a professional perspective

To make a CMYK conversion, you must change the color Settings made by the text. The conversion operation itself is very simple, and is originally a "how to convert to obtain high quality in order to reproduce the desired color" problem, but it is a professional technical problem. In order to reproduce colors close to RGB images, density adjustment and level adjustment are required, and skills are performed within the CMYK color space to obtain the desired colors. Examples of key points for achieving high quality color reproduction are given below

 

(1) While adjusting the generation of black plate, the conversion operation is carried out (making it possible to clear black plate text printing, gray balance adjustment, close to the original color, the pursuit of details, etc.);

 

(2) Because the printing plate is sometimes inaccurate, so it is necessary to trap processing (so that the background color is not too conspicuous). The second point in the image data or background has layers of occasions, to prevent the plate is not allowed to have quite difficult, the need for skilled technology. Such work can be said to be a professional job.