Fine adjustment of color gradation at the beginning of printing

Fine adjustment of color gradation at the beginning of printing

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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.