Print color should conform to original, true, natural, coordinated

In the CY/TS-1999 Standards for Quality Requirements and Inspection Methods for Lithographic Prints, the requirements for "colors should conform to the original, authentic, natural, and coordinated" are specified. Although only 13 characters were used in the regulations, the general requirements for color reproduction of color reproduction prints have been basically outlined, and they are also important technical indicators of color reproduction in color reproduction. In essence, the reproduction and reproduction of a product's color are closely related to the quality of the manuscript, the tone level, texture, and contrast. This is because: the overall color change of the product screen and the intensity of presentation are closely related to the evolution of the overall picture of the attached manuscript, such as definition, tone level, texture, and flavor. That is to say, the color reproduction prints realize the reasonable requirements and actual reproduction of "colors should conform to the original, true, natural, and coordinated", and are the quality of the manuscripts (traditional manuscripts), as well as the operator's knowledge, artistic literacy, There is a direct relationship between technical skills and practical experience.

In the current color reproduction process technology, although the specific conditions of DTP and CTP advanced prepress processing equipment and technology are adopted, it is still difficult to realize the ideal requirement that the color reproduction product “color should conform to the original, true, natural, and coordinated”. The total color of the product screen can be approximated to the quality of the original document. Or the overall effect of restoring the original to the product is intuitively achieved.

The color should match the original. The specific analysis and research on it can roughly have the following situations: First, when the customer provides a good definition, the tone level changes more abundantly, and the overall image does not have a serious color cast. The overall image frame contrast meets the requirement of plate-making for latitude. Manuscripts, and in the prepress processing strictly enforce the norms and data control, give full play to the DTP or CTP system in the color management and creative and effective features, can achieve the color of the approximate manuscript effect. Second, when customers provide poor resolution, poor tone levels, the entire screen has a serious color cast, and the original image of the overall contrast is too large or too small defects, etc., in the prepress processing and the lack of analysis of the manuscript Strength, there is no corrective measures when making, just blindly pursuing "manuscript reproduction", and lack of strict normative operations in the print version; lack of matching control of the color version of the ink in the printing, etc., the result must reproduce a poor product . Thirdly, it is the customer who provides poor quality manuscripts. For example, he conducts specific analysis and research on the manuscripts before the prepress processing, and takes necessary measures for certain defects in the manuscripts to design a practical construction plan and give full play to the DTP or The role of CTP system color management and creative functions, strictly regulate the operation, so that some defects of the manuscript can be reasonably and effectively improved and improved, so that the overall quality of some products in the visual effect over the original, and get a higher quality level product.

In color reproduction, the overall hue of the product screen is required to be “true, natural, and coordinated”, which is the specific performance index of the print “color should conform to the original”. In other words, the product screen achieves the concrete realization of the color “real, natural, and coordinated”, and is also based on the clarity of the screen, the richness of tone levels, and the strength of texture expression.

The color is true. Means to copy the product lifelikeness, to restore the original (high-quality horizontal manuscript), or to realistically represent the natural colors of the natural scenery (natural color and light color, natural colors, etc.) effect. The fact that color prints achieve trueness in color combinations is an important technical indicator. Generally speaking, the color of the product is true, and it is essentially a concept that compares the color of the image recorded by means of photography or the like with the natural hue of the natural scene. Therefore, in the prepress processing, it is necessary for the DTP or CTP operator to have a discriminating ability that compares and recognizes the inherent color of the reproduced original picture with the inherent color and color change of the natural scene, so as to facilitate the pursuit of true reproduction of the printed color.

Natural colors. It means that in the overall tone reduction distribution and combination matching presentation in the product screen, no natural reproduction is lost due to color skipping, coloration, and the like. Relatively speaking, the hue, hue, color contrast, color contrast, color saturation, and package brightness that are displayed on the screen all conform to the change rule of the color combination, and the result of natural color reproduction is necessarily obtained in the print screen. The color of the product screen is naturally presented. It is also based on the clarity of the picture and the richness of tone levels. Strong texture and other foundation. Otherwise it will lose the natural effect of the screen color.

Color coordination. It refers to the coordination of overall tone reduction and distribution in the product screen. In the product picture, the coordination of the opposite color system with the basic color system and the sub-primary color system is the basis for obtaining color coordination. For example, reasonable matching between primary colors and complementary colors, cool colors and warm colors, neutral colors and cold and warm colors is the key to color coordination. Of course, the overall coordinated reproduction of the product screen color is also closely related to the sharpness of the screen, rich tone levels, texture intensity, etc. Otherwise, the effect of screen color coordination will be lost.

In short, the color reproduction achieves "the color should conform to the original, true, natural, and coordinated" and it is indeed difficult to obtain an exact conclusion by using the quantitative data to make an objective evaluation. Therefore, in the evaluation of color prints, quantitative data (related data) and qualitative (psychological impressions) can be combined to make the subjective impression of the evaluator consistent with the objective quantitative data, and each subjective evaluation can be performed. A variety of factors should be objectively interpreted to obtain an accurate evaluation conclusion. Of course, participating in evaluators’ knowledge, technical literacy, artistic aesthetics, etc., is a fundamental and indispensable condition for the evaluation of the product “color should conform to the original, true, natural, and coordinated”.

Source: Bison

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