Control During Printing; 2-Dot Pair + Bi-Directional Printing; Seam Stripe Control; Rest Between Scans (Border Detection Control) - Canon S600 Service Manual

S600

1.3 Control During Printing

The printer can produce high-quality printing with no smearing or irregular density
with the cartridge, selected media, printing quality setting, printing data, etc., by
altering the carriage operation, paper feed operation, etc.
By shifting the printing timing with multiple passes during printing, one raster is
printed with multiple nozzles. The amount of ink ejected by each nozzle is kept
constant to reduce irregular printing density. Also, smearing is less likely to occur since
the freshly printed ink is fixed before the next ink is printed. Depending on the paper,
up to eight passes can be executed for printing. (For the number of passes allowable in
each mode, see

1.3.1 2-dot Pair + Bi-directional printing

In the case of conventional bi-directional printing, when for example cyan and
magenta are mixed to produce blue, cyan is printed during the first pass and magenta
is printed during the second pass. The color printed on the first pass always comes
out stronger than the color printed on the second pass. The subtle difference in color
between the first and second passes creates irregular printing between scans. To
resolve this problem, the printer uses two nozzle arrays for each color to print each
pixel at 600 dpi. The image is created with 2 dots, and the sequence of printing each
dot is controlled.
In other words, the C2 M2 and M1 C1 portions to be printed during the first pass are
mixed during a single scan. In the same way, the C1 M1 and M2 C2 portions to be
printed during the second pass are mixed.
The difference in color caused by the printing sequence still occurs, however, it is not
recognized as irregular printing because it changes at 1200 dpi intervals.

1.3.2 Seam stripe control

Seam stripe control suppresses the stripes created at the seams between passes. It
aims to produce a high-quality image with a single pass.
For high-duty images where seam stripes are prone to occur between each pass, a
dot-thinning process is executed. The degree of thinning to be implemented is
determined when the user executes the print head position adjustment with the
printer driver.

1.3.3 Rest between scans (Border detection control)

To prevent color smearing and a whitish color cast along the border between a color
ink and black ink caused by the inks' differing characteristics, printing can be
executed with a rest inserted between scans.
During the printer's internal print processing, the border between color and black
inks is detected. When color ink is printed along a border with black ink, a wait is
added for ink drying. The wait is set for each printing mode and each color. This
reduces ink smearing.
Since this operation reduces the throughput, the user is able to select a rest between
scans (a special setting) for only plain paper or postcards (when smearing is most
prone to occur). It is executed if the print data includes borders between black and
color inks.
7.1 Print Modes. )
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Part 3: Technical Reference