The most popular use of color management and Remot

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Using color management and remote proofing to move towards the era of remote printing (II)

(VI) color evaluation of digital proofing:

1 The main methods used to evaluate the color of general buildings are:

(1) visual method - color management

(2) measurement method - device calibration

2 Key points of color evaluation:

(1) single color stimuli

(2) measurement method test target test guide table

(3) complex color image

(4) the product potential of visual method has been continuously explored -standard test image

3 Color evaluation comparison

(VII) color difference

finally, when we mention color control, there is an idea that cannot be ignored, because in the end, whether the manufacturer, customer or contractor 'occupy' means' die without effort '. In order to ensure the color consistency of what we finally see when subjected to horizontal forces, we must pay attention to the problem of color difference

1. Definition of color difference: refers to the difference in color perceived by the eyes when comparing two color objects, referred to as Δ E。

2. Generally referred to Δ E is the color difference formula of CIELAB uniform color space formulated by CIE in 1976

Δ E=[(L1-L2)2+(a1-a2)2+(b1-b2)2]1/2

3. Generally speaking

(1) Delta e 6: unacceptable. It is easy for human eyes to recognize the color difference

(2) Delta E 4: acceptable. Human eyes can recognize the color difference, but it is not very obvious

(3) Delta E 2: human vision can hardly recognize the color difference

The big stage of CTP competition: expectations at the all printing exhibition at 9:14 on May 29, 2006 source: printing technology at 9:14 on May 29, 2006. Looking at the global CTP equipment sales statistics, it is not difficult to find that in Europe and the United States, CTP technology has become the first choice in the field of prepress plate making, and the market share has been rising. Especially after 2000, with the sharp decline in the price of CTP equipment and the maturity of CTP plates, many small and medium-sized printing enterprises began to accept and use CTP technology. Compared with the growing prosperity of the international market, the impact of CTP technology on the domestic printing industry is far less profound and extensive than that of the international market. The second China International all printing exhibition to be held in Shanghai in june2006 will play a role in promoting CTP technology in the domestic printing industry. Let's have a look at the highlights of CTP and digital workflow in advance

ctp equipment competition

there have been many debates on the selection of CTP technology, especially the debate on "photosensitivity and thermal sensitivity". Typical representatives of thermal CTP include Kodak Cleo, Lausanne, pressek and other companies, which position their products on the 830nm thermal CTP, and the equipment specifications extend from folio to 4-open and super large. At present, the photosensitive CTP is mainly based on purple laser CTP technology. For example, the product of Krause company is purple laser CTP. In addition, some companies, such as Agfa, screen and Fujifilm, provide both thermal CTP equipment and photosensitive CTP equipment

so far, it is difficult to say which is the winner in the competition between photosensitive CTP and thermal CTP, because they have their own advantages. For example, violet laser equipment has the advantages of fast plate making speed and long light source life; Thermal devices have the advantages of good imaging quality. In fact, both photosensitive CTP and thermal CTP are very mature in terms of technology. No matter which technology the printing enterprise chooses, it can get the support of the market. Moreover, it can be predicted that this situation of photosensitive and thermal coexistence will be difficult to change in the next ten years. Therefore, in this all printing exhibition, we might as well abandon the dispute between photosensitivity and thermal sensitivity and focus on the output performance, output quality and service life of CTP equipment

at present, one of the main reasons why CTP equipment has not been popularized in China is the high cost of equipment. In fact, we can expect suppliers to lower the application threshold of CTP technology at this all print exhibition. In drupa 2004, "lowering the application threshold of CTP technology" has become the consistent slogan of major CTP equipment suppliers, who have launched low-end products suitable for small printing enterprises. For example, in the four open markets, Agfa and ESCO have both introduced low-end CTP equipment with manual renewal and a price below US $100000. The difference between these low-end products and high-end products is only reflected in the way of the previous version and the output format. In IPEX 2006, Agfa launched Palladio II CTP, which is mainly aimed at printing enterprises with low operating costs, such as small commercial printing enterprises and small newspaper printing enterprises

at present, domestic CTP equipment manufacturers are also preparing to take a share in the fierce market competition. The manufacturers that have developed CTP equipment include Beida Huatong, Sitong, Hangzhou Kelei, Shenyang Boji, Dongfang communication, etc. Although these domestic enterprises can not be compared with international well-known manufacturers in terms of popularity and influence, and their products are also far away from foreign brands, it is believed that it is only a matter of time before domestic brands compete with international brands. The All India exhibition also provides a stage for domestic CTP equipment suppliers to fully display themselves

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