Lexmark 935dn - C Color Laser Printer Troubleshooting Manual page 9

My color transparencies seem dark when they are projected.
Is there anything I can do to improve the color?
This problem most commonly occurs when projecting
transparencies with reflective overhead projectors. To obtain
the highest projected color quality, transmissive overhead
projectors are recommended. If a reflective projector must be
used, then adjusting the Toner Darkness setting to 1, 2, or 3 will
lighten the transparency. Make sure to print on the
recommended type of color transparencies.
What is manual color correction?
When manual color correction is enabled, the printer employs
user-selected color conversion tables to process objects.
However, Color Correction must be set to Manual, or no
user-defined color conversion will be implemented. Manual
color correction settings are specific to the type of object being
printed (text, graphics, or images), and how the color of the
object is specified in the software program (RGB or CMYK
combinations).
Notes:
• Manual color correction is not useful if the software
program does not specify colors with RGB or CMYK
combinations. It is also not effective in situations in which
the software program or the computer operating system
controls the adjustment of colors.
• The color conversion tables—applied to each object when
Color Correction is set to Auto—generate preferred colors
for the majority of documents.
To manually apply a different color conversion table:
1
From the Quality menu, select Color Correction, and then
select Manual.
2
From the Quality menu, select Manual Color, and then
select the appropriate color conversion table for the
affected object type.
Manual Color menu
Object type Color conversion tables
RGB Image • Vivid—Produces brighter, more
saturated colors and may be
RGB Text
applied to all incoming color
RGB Graphics
formats.
• sRGB Display—Produces an
output that approximates the
colors displayed on a computer
monitor. Black toner usage is
optimized for printing
photographs.
• Display—True Black—Produces
an output that approximates the
colors displayed on a computer
monitor. Uses only black toner to
create all levels of neutral gray.
• sRGB Vivid—Provides an increased
color saturation for the sRGB
Display color correction. Black
usage is optimized for printing
business graphics.
• Off—No color correction is
implemented.
CMYK Image • US CMYK—Applies color
correction to approximate the
CMYK Text
SWOP (Specifications for Web
CMYK Graphics
Offset Publishing) color output.
•
Euro CMYK—Applies color
correction to approximated
EuroScale color output.
• Vivid CMYK—Increases the color
saturation of the US CMYK color
correction setting.
• Off—No color correction is
implemented.
How can I match a particular color (such as a corporate logo)?
From the printer Quality menu, nine types of Color Samples sets
are available. These are also available from the Color Samples
page of the Embedded Web Server. Selecting any sample set
generates a multiple-page printout consisting of hundreds of
colored boxes. Either a CMYK or RGB combination is located on
each box, depending on the table selected. The observed color
of each box is obtained by passing the CMYK or RGB
combination labeled on the box through the selected color
conversion table.
9
By examining Color Samples sets, a user can identify the box
whose color is the closest to the desired color. The color
combination labeled on the box can then be used for modifying
the color of the object in a software program. For more
information, see the software program Help topics. Manual
color correction may be necessary to utilize the selected color
conversion table for the particular object.
Selecting which Color Samples set to use for a particular
color-matching problem depends on the Color Correction
setting being used (Auto, Off, or Manual), the type of object
being printed (text, graphics, or images), and how the color of
the object is specified in the software program (RGB or CMYK
combinations). When the printer Color Correction setting is set
to Off, the color is based on the print job information; and no
color conversion is implemented.
Note: The Color Samples pages are not useful if the software
program does not specify colors with RGB or CMYK
combinations. Additionally, certain situations exist in which the
software program or the computer operating system adjusts
the RGB or CMYK combinations specified in the program
through color management. The resulting printed color may
not be an exact match of the Color Samples pages.
What are detailed Color Samples and how do I access them?
Detailed Color Samples sets are available only through the
Embedded Web Server of a network printer. A detailed Color
Samples set contains a range of shades (displayed as colored
boxes) that are similar to a user-defined RGB or CMYK value. The
likeness of the colors in the set are dependent on the value
entered in the RGB or CMYK Increment box.
To access a detailed Color Samples set from the Embedded Web
Server:
1
Open a Web browser.
2
In the address bar, type the network printer IP address.
3
Click Configuration.
4
Click Color Samples.
5
Click Detailed Options to narrow the set to one color range.
6
When the Detailed Options page appears, select a color
conversion table.
7
Enter the RGB or CMYK color number.