What is the difference between … TVI, AVT and SCTV?

The concepts of AVT (Aim Values Tolerance), SCTV (Spot Color Tone Value), and TVI (Tone Value Increase) are all related to color management in printing, but they focus on different aspects. Let’s see how they correlate:

  1. TVI (Tone Value Increase):TVI is about the increase in the darkness of a printed color compared to its intended darkness in the design. It occurs due to ink spreading and absorbing into the paper, making the printed color appear darker.TVI is important for controlling the reproduction of tones, especially mid-tones and shadows, in offset printing.
    TVI(色调值增加):TVI 是指与设计中预期的暗度相比,印刷颜色的暗度增加。这是由于油墨扩散并吸收到纸张中,使印刷颜色显得更暗而发生的。TVI 对于控制胶印中的色调再现(尤其是中间色调和阴影)非常重要。
  2. AVT (Aim Values Tolerance):AVT deals with how much variation from the intended color is acceptable in the final print. It’s about the allowable deviation in color reproduction.While TVI focuses on the darkness of tones, AVT is more about the overall color accuracy.
    AVT(目标值容差):AVT 涉及最终打印中可以接受的与预期颜色的偏差程度。它是关于色彩再现的允许偏差。TVI 侧重于色调的暗度,而 AVT 更注重整体色彩准确度。
  3. SCTV (Spot Color Tone Value):SCTV is a method to adjust how spot colors (specific, pre-mixed inks) are perceived under different lightness level. It ensures that colors look consistent, irrespective of their lightness or darkness.SCTV can influence how tone values (including those affected by TVI) are perceived in the final print.
    SCTV(专色色调值):SCTV 是一种调整专色(特定的预混合油墨)在不同亮度水平下的感知方式的方法。它确保颜色看起来一致,无论其亮度或暗度如何。SCTV 可以影响最终打印中的色调值(包括受 TVI 影响的色调值)。

In summary, TVI is directly concerned with how the tone values (darkness) of colors change in the printing process. AVT relates to the acceptable range of these changes (or any color variation), and SCTV adjusts the perception of these changes, especially for spot colors. All three work together to ensure accurate and consistent color reproduction in offset printing.
总之,TVI 直接关系到印刷过程中颜色的色调值(暗度)如何变化。 AVT 涉及这些变化(或任何颜色变化)的可接受范围,而 SCTV 则调整这些变化的感知,特别是对于专色。三者共同作用,确保胶印中准确、一致的色彩再现。