QMS Magicolor 6100, Operation Manual, Page: 118 / 224

perform color matching automatically. These drivers work with the printer-resident
color rendering dictionaries to match colors.
The advantages of the QMS Advanced Level 2 color matching are that it is portable,
it is application- and printer-resident (there’s nothing else to buy), and it is performed
at the printer level (so it doesn’t tie up your host). However, no on-screen preview of
output is provided, and you are not warned if a color is out of printer’s gamut
(color range).
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For those who rely on the PostScript page description language for CIE-based color
space matching, the
magicolor
6100 has three built-in Color Rendering Dictionaries
(CRDs)—Business, Colorimetric, and Photographic to product printer-calibrated
images.
The Business CRD simulates colors found on the typical RGB computer display and
is intended for use with business graphics. This CRD is best utilized when printing
transparencies or documents requiring a high level of color saturation.
The Colorimetric CRD can be used for very basic color matching and one-to-one
conversion of CIE color to CMYK color. For those colors that cannot be produced on
the printer, the closest color the printer can produce is substituted.
The Photographic CRD is used for optimizing the quality of photographic images.
Colors that are out of the printer’s gamut (color range) are replaced with the closest
color in gamut. When this substitution is made, other specified colors, whether
in the printer’s gamut range or not, are adjusted equivalently so that the overall
image appearance and contrast is maintained. This technique is known as gamut
compression.
» Note:
The default CRD is either the Business, Colorimetric, or Photographic. The
printer’s default CRD can be changed through the Macintosh and Windows drivers or,
if your application requires you to use a non-QMS driver, you can change the CRD at
the printer’s control panel (Administration/Emulations/PostScript/Color Rendering
menu). See chapter 2, “Printer Configuration,” of the Reference manual for
information on using the control panel.
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For creative professionals opting to use a host-based color management system
(CMS), QMS provides ICC printer profiles to define the printer’s color space to the