Using color management and remote proofing towards the era of long-distance printing (II)

(6) Digital proofing color evaluation:

1. The methods used to evaluate color are:

(1) Visual Inspection - Subjective Evaluation (Color Management)

(2) Measurement - Device Calibration

2. The focus of color assessment:

(1) Single Color Block - Single Color Stimuli

(2) Measurement method - Test target test guide

(3) Complex Image - Complex Color Image

(4) Visual inspection - Standard Test Image standard proofs

3. Comparison of color assessment

(7) Color difference

Finally, when we talk about color control, there is a concept that cannot be ignored because, ultimately, regardless of the manufacturer, the customer or the printer, in order to maintain the color consistency of the last thing seen, it is necessary to pay attention to the problem of color aberration.

1. Definition of Color Difference: It refers to the difference in the color of the eye when comparing two color objects, abbreviated as ΔE.

2. The commonly referred to as ΔE is the color difference formula of CIELAB uniform color space developed by CIE in 1976.

ΔE=[(L1-L2)2+(a1-a2)2+(b1-b2)2]1/2

3. In general

(1) Delta E > 6: Unacceptable, human eye can easily recognize the difference in color.

(2) Delta E <4: acceptable, human eye can identify the color difference, but it is not very obvious.

(3) Delta E <2: The human eye can hardly recognize its color difference.

The big stage of ctp competition: expectation in the whole printing exhibition
May 29, 2006 9:14 PM Source: Printing Technology

Looking at the global CTP equipment sales statistics, we can easily find that: in Europe and the United States, CTP technology has become the first choice in the field of prepress printing and the market share is continuously rising. Especially after 2000, as the price of CTP equipment dropped drastically and the CTP media became mature, many small and medium-sized printing companies began to accept and use CTP technology. Compared with the increasingly prosperous international market, CTP technology has a far-reaching and extensive impact on the domestic printing industry as far as the international market. The 2nd China International Printing Exhibition, to be held in Shanghai in June 2006, will play an important role in promoting the promotion of CTP technology in the domestic printing industry. Let us know in advance the CTP and digital work at the All In Print Exhibition. The highlights of the process.

CTP equipment competition

There has been a lot of debate on the selection of CTP technology, especially the "photosensitive and thermal" argument. Typical representatives of thermal CTP include Kodak Creo, Lausanne, and Presstek. They locate their products on 830-nm thermal CTPs. The device specifications extend from open-front to 4-open and oversized. The current photosensitive CTP is based on violet laser CTP technology. For example, Krause's product is a violet laser CTP. In addition, there are some companies such as Agfa, Screen, Fujifilm, etc. that provide both thermal CTP devices and photosensitive CTP devices.

So far, it is difficult to say which one is the winner in the competition between photosensitive CTP and thermal CTP because they have their own advantages. For example, the violet laser equipment has the advantages of fast plate making speed and long lamp life, while the thermal equipment has advantages such as good image quality. In fact, both photosensitive CTP and thermal CTP are very mature in terms of technology. No matter which technology a printing company chooses, they can get support from the market and can predict that this kind of photosensitive and thermal coexist in the next decade or so. The situation is hard to change. Therefore, at this All In Print exhibition, we may abandon the dispute between photosensitive and thermal, and focus on the output performance, output quality, and service life of CTP equipment.

At present, one of the main reasons why China's CTP equipment is not yet popular is the high cost of equipment. In fact, at this All In Print exhibition, we can fully expect suppliers to lower the application threshold of CTP technology. In drupa 2004, "reducing the threshold of CTP technology application" has become the consistent slogan for major CTP equipment suppliers. They have launched low-end products that are suitable for small-scale printing companies. For example, in the four open markets, Agfa and Esko have introduced low-end CTP equipment with manual renewal methods and prices of less than US$100,000. The difference between these low-end products and high-end products is only reflected in the upper version mode and the output format. At IPEX 2006, Agfa launched the Palladio II CTP, targeting low-cost printing companies such as small commercial printing companies and small newspaper printing companies.

At present, domestic CTP equipment manufacturing companies are also preparing to share in the fierce market competition. The manufacturers that have developed CTP equipment include Beijing University Huatong, Sitong, Hangzhou Kelei, Shenyang Boji, and Dongfang Communication. Although these domestic companies can not be compared with internationally renowned manufacturers in terms of popularity or influence, and the products produced have a certain distance from foreign brands, it is believed that it is only a matter of time before domestic brands compete with international brands. The exhibition also provided a stage for Chinese CTP equipment suppliers to fully demonstrate themselves.