Printed originals require four-color electricity for the system-version. Apple's color separation manuscripts include reflections (such as color pictures, drafts, watercolors, oil paintings, Chinese paintings, new year pictures, gouache, etc.) and transmissions (such as color reversal films (natural color positive films), color negative films, etc.). The color negative on the negative manuscript is opposite to the original scene, and the color is complementary to the original scene. For example, the opposite color of magenta on the negative film is green; the opposite color of yellow complement is blue-violet; the complementary color of red is opposite. The shading on the original is the same as the original scene, and the color is exactly the same as the original scene. The printed copy transmission is a visual image formed by the transmitted light. The reflective document is a visual image formed by reflection of the original under illumination of the light source. The tone of the printed matter is that the color is classified according to the brightness and darkness, and the color reproduction, tone reduction, texture restoration, and resolution reduction are achieved in the copying work of the printed product. The color reproduction is accurate in hue, and the copied and printed products truly reproduce the color of the original, without color cast and without mottle. The ideal tone reduction means that the tone on the original is faithfully restored on the printed product to meet the original copying requirements. Since the maximum recording density of printed matter is 1.8, after reaching 1.8, it becomes a straight line parallel to Dt (original density), so it is necessary to adjust both the reflective and the transmissive draft, in order to compress the contrast and correct the chromatic aberration to achieve the appropriate The range of print reproduction tones. For example, the highest density on a color positive original is Dt=3.0, and the maximum recording density of a print is Dr=1.8. According to the curve, the reproduction of the printed matter can not achieve the highest density reduction of the original, because the materials used in the reproduction of the printed matter include ink, paper, photosensitive materials (film, PS-version -), color sequence, and printing machinery. Limit, the maximum recording density Dr=1.8, but when Dt=3.0, the highest density of the original is large, and only the contrast can be compressed, otherwise the actual effect will not be printed. Prints often require a tone adjustment when the tone is restored. When the density contrast of the original is larger than the highest recording density of the printed matter, in order to make the various tones of the original appear on the printed matter, it is necessary to appropriately adjust the tone reduction. Secondly, in order to adapt to the copying requirements of some special manuscripts (such as bright-based photos, dark-key photos), certain tones of the original must be appropriately emphasized, and other tones must be compressed accordingly. The main feature of linear compression is the equal scaling of the various grading segments. Linear compression does not represent true visual proportional compression, because the D-Y curve is also non-linear. After this compression, the bright focus is on the human eye. It is not easy to distinguish, resulting in a "grey level" phenomenon. The reproduction of the tone refers to the relationship between the original density and the percentage of duplicate dots. To make all the tones and colors on the original appear on the printed matter, first select the correct level curve. The level is the basis of the tone and color change. If the level of the picture is not rich, the performance of the color must be monotonous and boring. Only when the level is realistic, can the vivid color change. It is impossible to faithfully copy the original, because most of the original density contrast is greater than the density contrast of the printed matter, so the copy of the print must be compressed. Therefore, it is necessary to lose the subtle level of the part. In the actual operation, the reasonable level curve should be adjusted according to the contrast of the original and the specific content of the tone, that is, the level of the secondary part on the reflective draft or the transmissive draft. Compression, focusing on the main parts of the hierarchy, highlighting the characteristics. Under the premise of the normal contrast of the color draft, the gradation curve is correctly adjusted according to different types of originals. The level control of the Apple computer for electrical extensions and color separation is convenient and flexible. It can be locally reinforced or compressed, but it is important to pay attention to the balance of the gradation curve of the color separation slice. The neutral gray balance should be appropriate, and the incorrect gradation curve will distort the replica. Therefore, when operating the extension and Apple computers, pay special attention to the correct use of the hierarchy, but for the entire color cast of the original, it can be corrected by adjusting the hierarchical curve. Article source address: http:// L Shaped Desk Corner Computer Standing Desk for Home Office L Shaped Standing Desk,Adjustable L Shape Manager Desk,L Shaped Office Standing Desk,L Shaped Corner Desk CHEX Electric Standing Desk , https://www.chexdesk.com
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