Canon MultiPASS C50 User Manual page 224

Problem
Hue changes
Printed blue
looks purple
Colour images are
missing some detail
8-28
Troubleshooting
Possible cause
The print head nozzles
may be clogged with dust.
An ink tank may be
empty.
Blue prints as purple
because of the different
technologies used by the
PC's monitor and the
MultiPASS C50: the monitor
uses RGB (Red, Green, Blue)
colour, while the MultiPASS
C50 uses CMYK (Cyan,
Magenta, Yellow, Black)
colour. Thus, the printed
blue (a mix of cyan and
magenta) looks
darker and more purple
than the blue on the
monitor.
You may not have the
optimum settings selected
on the PC.
Solution
Clean the print head. See
page 9-9.
Replace empty ink tanks
as needed. See page 9-17.
On the PC, select Match
colour (screen matching) to
provide a lighter colour
blue.
If you are not using screen
matching, decrease the
amount of magenta by 30%
to produce a royal blue.
If you just want a nice blue
colour, try cyan. It prints
beautifully and quickly,
and is available in almost
all applications that support
colour. See the MultiPASS
Desktop Manager User's
Guide.
On your PC, make sure to
select Plain Paper, Colour
Mode, and Halftoning =
Pattern. If these are already
selected, change the Media
Type setting from Plain
Paper to Coated Paper. See
the MultiPASS Desktop
Manager User's Guide.
Chapter 8