Proofing. Analog proofing. Digital proofing. Proofing

Proofs- Image serves as a model for color reproduction when replicating the printed material. Is an important tool for ensuring the quality of color reproduction in printing, along with densitometric and colorimetric control.

In a broader sense of color-proof can be called any image which the customer considers a model of color printing: print on the printer or original photographs even sample the goods for the directory however, printer rarely able to "get" in the proposed image if its preparation were not taken into account the realities of the printing process: using paper and paint, especially the printing press and prepress. In a narrow sense Proofing - specially prepared image obtained with the use of specialized equipment tsvetoprobnogo. This can be probopechatny machine analog proofing, digital proofing and proofing. Each has its advantages and disadvantages, but in most cases today recognize the best digital color.

Probopechatny machine
Theoretically the best way to control image prior to printing. The process uses real plates, this paper and paint. You can control the appearance of moire, because the raster structure of the reproduced image. However, this method may not take into account the peculiarities of various printing machines temperature and humidity in a printing house. Besides, is - the most expensive method and is justified only for publications with very large numbers.

Analog Proofing
Performing a special (and very expensive) equipment. Raw materials - color separation film. At the same time on special media alternately applied paint colors CMYK. This method also allows you to identify problems with moire, because the raster structure of the plays. Theoretically analog proofing is less flexible, rather than digital. However, practice, it provides its greater reliability and stability. Analog proofing fundamentally depends on the ability to customize it a specific person, correctness of his actions and precision instruments.

Analogue proofing is divided into "dry" and "wet".
"Dry" Mac OS X:

• Equipment: laminator, exposure apparatus kolondriruyuschie (WARMING) rollers;
• Materials: paper - hromalit (base), photosensitive film Toner (pigment) 4-color (CMYK).

"Wet" Mac OS X:

• Equipment: laminator, exposure apparatus showing the installation, drying;
• Materials: photosensitive film (base) 4-color (CMYK).

Digital Proofing
Produced using printers as a specially produced for this purpose in the tsvetoprobnyh complexes, and using high-quality inkjet printers. On the basis of such devices, a series printers Epson Stylus Pro, produce even commercial tsvetoprobnye system. The main advantage of such systems - low price although they do not provide printing quality, required to play the raster points. Making digital proofing involves building a profile of printing process and a profile of printing devices to produce proofs. To calculate the profiles used special software which analyzes the data set of colorimetric measurements of test prints, created spectrophotometers (the most common spectrophotometers of the same companies). Digital proofing - the most flexible tool because it can take into account any particular individual print printing production. The main conditions of its application in this case becomes a high repeatability of the printing machine and the same results over time.

Proofing
In this case, the sample image is the "image" on the computer screen. This may be normal professional calibrated monitor or a specialized business systems for proofing. The main advantage - efficiency and low price for each use. The drawback is in fact that psychologically the image on the print (in reflected light) and the luminous image on the monitor are perceived by man in different ways. To use such systems, the printer must have special skills.