Operation Manual

Epson Stylus Pro 7900/7910/9900/9910 User’s Guide
Problem Solver
105
Print quality is poor, uneven, too
light, or too dark.
Have you compared the printing result with the image on the display monitor?
Since monitors and printers produce colors differently, printed colors will not always
match on-screen colors perfectly.
O Televisions and monitors produce a range of colors by combining the 3 colors
known as the 3 primary colors of light, red (R), green (G), and blue (B). When none
of the lights are shining, the result is black, and when all 3 colors are shining, the
result is white.
O However, color gravure printing and color printers use a combination of the 3
primary colors of pigment, yellow (Y), magenta (M), and cyan (C). When no color is
applied, the result is white, and when all 3 colors are mixed evenly, the result is
black.
O Printing a scanned image necessitates the changes from the original image (CMY)
to the monitor (RGB) then to the print (CMY), making color matching even more
difficult. In this case, color matching between the devices is handled by ICM
(Windows) or ColorSync (Mac OS X).
When using a color management system such as ICM (Windows) or ColorSync (Mac
OS X), have you set a monitor profile?
For proper management, the input devices and applications used must support ICM
(Windows) or ColorSync (Mac OS X). Also, it is necessary to set the profile for the monitor
that you are using.
Did you open the front cover during printing?
If the front cover is opened during printing, the carriage stops suddenly causing
unevenness in the color. Do not open the front cover during printing.
Does INK LOW appear on the LCD panel?
The print quality may decrease when the ink is nearly expended. Replace the ink
cartridge with a new one. If the print quality is not good after replacing the ink cartridge,
perform head cleaning a few times.
The color is not the same as
another printer.
Colors vary depending on the printer type due to each printer’s characteristics.
Since each printer differs according to the model, such as the ink, printer driver, and
printer profile, hence each printer’s results slightly differ as well. You can achieve similar
colors with the same color adjustment method (sRGB or Adobe RGB) or gamma setting
by using the printer driver.
See “Using Color Management” on page 165
To match the color precisely, use the color measurement device to perform color
management.
Cause What to do