The eye is one of the most important sensory organs. The principle of eye color is consistent with the principle of additive color mixing. When the red, green, and blue light in the external light stimulate the corresponding cone cells, the nerves generate electrical impulses, form nerves, and transmit to the visual center on the cerebral cortex, forming a certain color, and different colors. Different visual effects. The same color will have different hall effects under different contrasting changes. This is because the color contrast in the same picture will affect the brain's judgment of color. This is one of the important principles used in our color conversion. Leather Chair,Leather Lounge Chair,Leather Desk Chair,Brown Office Chair Feat Top International(China) CO.,LTD , http://www.loungefurniture.cn
Thermal transfer technology: This technique contains a pigment block of wax and is transferred to special paper. However, the color space that this technology can cover is different from the traditional offset color space. The proofs using the thermal transfer technique are rough in appearance, and the dots generated are not consistent with the printed halftone dots. The equipment investment is 8,000 US dollars and the printing fee is about 3 US dollars each time.
Sublimation Technology: The proofing system with thermal sublimation technology uses a printhead containing thousands of heating elements and a color strip containing CMYK pigments for proofing. The print head can produce 256 different levels of heat, allowing the solid pigment to sublimate into vapor and condense on the receiving medium. At the center of each point, the color is darker and the edge is lighter. When the four printing colors are printed, the four colors are fused together to form a continuous tone image. The average set of such equipment is about $25,000 and the cost for printing is about $7.
Inkjet Technology (Professional): The inkjet proofing system ejects ink onto paper to form an image. Although paper costs are lower than thermal sublimation, overall, the entire system is more expensive and requires more maintenance. The price is between 44500-69000 USD. Each printing fee is about 2-3 USD.
Laser technology: This technology has high precision and can produce halftone dots, and the specific technologies used are different. The system accuracy reaches 1800dpi to 4000dpi. The equipment costs about US$200,000-275,000. Each of these proofing systems costs about $15 per sample.
The appropriate printers only provide hardware features, and the more critical part of the entire proofing system is the part of the color management software. In the topic of digital proofing, there is often a term called “ICC PROFILE†which is actually a data file with a standard format used to record the unique color gamut of different color output devices. The application of this "ICC PROFILE" in the digital proofing system is just a common procedure. The supporters need to know how these data are generated effectively. Do you allow users to perform regular maintenance? This depends entirely on the software features of individual manufacturers. The following technical description briefly introduces how Agfa can use unique concepts so that different grades of printers can perform their best color simulation capabilities.
Software Introduction Our perception of natural colors determines the type of light source, how the object changes the reflected or transmitted light, and the sensitivity of our eyes to the changed light.
First, there is a need for methods to measure and define colors. The colors that can be seen can be composed of: hue, saturation, and brightness. Hue The intensity of one or two colors of light with the largest amount of RGB trichromatic light. When the RGB amounts are equal, the color becomes unsaturated, appearing gray or white, and the luminance is the RGB light wave stimulating the intensity or wave height of the eye-sensing cell. These characteristics can be stacked by some "discs" out of a three-dimensional color model, and the change in the circumference of the disc is described as the hue moves from the bottom up to increase the brightness of the disc. Each disc moves outward from the center to increase saturation. This model is - irregular, because the eye is sensitive to different colors.
Each device has its own gamut space, and some colors can be seen on the screen but cannot be represented by the output device. This is because of the inconsistency in the public space of the screen and the output device. Agfa CMS can connect and match two public spaces to solve the problem of color conversion. When the screen color is used to simulate the printing color, a method can reduce the incapable color space to a representable color space, change the color of the surrounding environment, and utilize the relationship between the eyes and the brain to simulate different color gamuts. Between the results, so the latter is more a winning method that can make all color output devices have a certain color simulation capabilities.
Digital proofing applications <br> <br> existing digital proofing technology has been able to meet most general users. They mainly pursue speed, stability and cost effectiveness. These three aspects of performance digital proofing are obviously much better than traditional proofing. Examples of users include general books, magazines, and textbook printing.
For high-end users, although the above three major advantages can not fully meet them and color quality is the most important requirement, precisely because of the stringent requirements of these users, a layout usually requires multiple modifications in the production process, and many of these A variety of users, such as advertising agencies, have begun to use digital proofing as a TESTPROOF (draft). In the process of modification, digital proofing has been used until the modification is completed and then a traditional proofing is done. This is to save a lot of repeated proofing costs.
Is it possible to draw a conclusion in the final part of this introduction: Is digital proofing mature? How to choose equipment? In fact, different users will have different answers, depending on the importance of each feature of digital proofing described above to individual users.
The above introduction hopes to provide some references for everyone. The last thing to be pointed out is that today's digital proofing technology has reached a certain degree of practicality, but users must pay attention to the cooperation of software and hardware in selecting equipment, in order to achieve the best results.
Source: I love printing network
Digital proofing hardware introduction: