a drop-out color is a color visible by a human eye but not visible to the scanner.

    to check the grounding color of document for a drop-out color, use the method and follow the standards given below.

    1 print density measurement

    the measurement must be made in one of the following ways:

    (1)a light source using fluorescent.

    (2)macbeth pcs meter pcm ii is used, which requires a filter.

   

    2 drop-out color standard

    in the spectrum of fluorescent lamp the pcs value must satisfy the following standards:

    (1)maximum: 0.14 or less

    (2)average: 0.1 or less