RELATIVE PRINT CONTRAST
Relative print contrast measurement evaluates the shadow
tone to the solid. It is an indication of the print quality, whether
it is "sharp" or "flat."
To achieve maximum contrast, high density and "sharp" images
are desired. This measurement will give a quick indication of
the optimal ink feed relating to the shadow tones.
Relative Print Contrast Equation:
% Print Contrast =
(1 - (D
t
- D
p
)) x 100
Where:
Measurement Location:
Relative print contrast is normally made at the 3/4 tone (70%,
75% or 80% screen) and at the solid on the color bar.
D
s
- D
p
D
p
=
Density of paper
D
s
=
Density of the solid
D
t
=
Density of the 3/4 tone
