The basic principle of a sonometer densitometer is to measure the degree of darkening of light-sensitive materials after exposure and development, which is known as the density of blackness. During the printing process, the silver bromide on the light-sensitive material is reduced to metallic silver after exposure to light and development, forming a certain degree of opacity. Higher density of blackness indicates a higher density, while lower density of blackness indicates a lower density. The measuring instrument equipped with a color filter can also measure the color density of color original drafts. Its measurement principle is similar to the aforementioned basic principle.
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