Konica Minolta IC-301, User Manual, Page: 199 / 212

Glossary 191
Metamerism Metamerism occurs when two colors match under one light
source, but appear different under another light source. Those
two colors are called a metameric match. A metameric match
might cause problems when trying to match proofs to press-
sheets under different lighting conditions.
Midtones
Density values of an image (original or reproduction) between
the highlights and the shadows. In the reproduction, midtones
are printed with dot areas between approximately 40% or
60%. See also
Highlights
and
Shadows
.
Misregistration
A situation common during printing where one or more of the
color separations is slightly misaligned with regard to the
others on press. Misregistration shows up as white gaps or
tinted overlaps at the borders of color pairs. Colors containing
such files are trapped to compensate for this possibility. On
Continous Tone images, misregistration can lead to blurring.
See also
Overprint
and
Trapping
.
Moiré An interference pattern caused by differences in halftone
screen angles or rulings. In process color printing, screen
angles are selected to minimize this pattern. If the angles are
not correct, a pattern that distracts the eye from the picture
may be produced.
Newton's rings
Small concentric circles that can appear on film when two
surfaces are closed together but not in perfect contact.
Output resolution
The number of laser dots per unit of linear measurement
(millimeter, inch etc.) on film or paper.
Output tone curve
A graph showing the relationship of original input densities
and the corresponding dot percentages on film.
Overprint
A technique, which overlaps colored elements to eliminate the
appearance of gaps between elements caused by
misregistration of the various separations during printing. For
example, black text is normally set to overprint. See also
Trapping
and
Misregistration
.