Interpretation of print density

A: The light phenomenon of a color object generally has transmission, reflection, and selective absorption. As shown in Figure 3-20 (color), O is a color object. When the light energy of the incident light is Q in, it is selectively absorbed by the object O. The transmitted or reflected light energy is Q out. The density of the object O is:

D=lg (Q out/Q in)

Therefore, the density indicates the nature of the amount of light absorbed by the object. The object absorbs a large amount of light and its density is high: the object absorbs a small amount of light and its density is low.

Density is a common physical quantity used by the printing industry to measure the light transmittance of printed films and the depth of prints.

Source: Shenzhen Printing Network