DisplayMaker Legacy ColorMark+ - User Guide

B-4
color proof
A printed or simulated printed image of each process color using
inks, pigments, or dyes to give a visual impression of the final
reproduction.
color separation
The separation of a color image into four layers corresponding
to the four inks (CMYK) used in process printing. Each layer is a
halftone image in itself.
continuous tone
An original is continuous tone (or “contone”) when, instead of
being composed of halftone dots, the transitions from color to
color are continuous and invisible. For instance, a photograph is
a continuous-tone original.
density
A measure of the darkness of an image on paper or film. In the
case of paper, which is reflective, the less light reflected, the
higher the density. In the case of film, which is transparent, the
less light showing through, the higher the density.
dithering
Simulating more gray levels or colors than an output device can
actually render. Dithering uses patterns of dots. It is similar to a
halftone except that the dots have a fixed size while in a halftone
they have a variable size. Dithering is the electronic way of creat-
ing halftone images.
dot gain (press gain)
An imperfection of printing that causes dots to print larger than
they should. This imperfection is mainly caused by the absorp-
tion of ink by the paper. The reproduction thus becomes darker
than it should. Calibration can remedy this through a calibration
curve. Dot gain is most noticeable in the midtones.
flatbed scanner
Any scanning device that incorporates a flat transparent plate,
on which original images are placed for scanning. The scanning
process is linear rather than rotational.
gamma correction
Adjusting images, using gamma curves. Because of the character-
istics of a gamma curve, gamma correction does not affect the