Our perception of nature's colors determines the type of light source, how the object changes reflected or transmitted light, and the sensitivity of our eyes to changing light. 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 auditorium effects under different contrasting changes. This is because the color contrast in the same picture will affect the brain's judgment of color, which is one of the important principles used in our color conversion.

Measuring and defining colors

Visible colors 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 Application

Existing digital proofing technology has been able to meet most of the 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? Different users will have different answers depending on the importance of each feature of the 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.