The relationship between paper whiteness and color rendering

Whiteness of paper refers to the ability of paper to reflect light after being irradiated with light, and it is also called the brightness of paper, expressed as a percentage. The higher the whiteness of the paper, the better the surface of the ink can accurately represent the color characteristics of the ink. This is because the white paper reflects the color light synthesized by subtracting the color of the clear ink layer back. Therefore, paper with a high degree of whiteness can reflect almost all the shades of light, making the inks look bright and pleasing and have good visual effects. The paper with low whiteness, because it absorbs only part of the color light, can neither express the contrast of the light and dark parts truthfully, but can easily cause color casts. Some appear yellowish, others appear reddish, some appear greenish, and others appear blueish. When the paper itself color cast, the color printed on the paper is the effect of both the ink and the paper integrated color, and this will inevitably appear some color cast situation, based on this situation, when printing is necessary on the white paper Degrees and color casts were analyzed against the manuscripts and corrective measures were taken to correct the color cast. For example, when the color of the paper is yellow, it is not appropriate to use inks of dark yellow, peacock blue, and red, etc., that is, the ink should be used properly to eliminate color cast. On the other hand, the color shift can be corrected by the ink adjustment process.