Filter
Top Products
Seed Row
The seed row is basically the current raster data row, the
row being printed. It is maintained by the printer for use by
delta row compression. The delta compression replacement
bytes are applied to the seed row to create the new row.
This new data row is printed and becomes the new seed row.
For color raster images, the printer operates on each plane
independently, and a separate seed row is maintained for
each graphic plane. A Y offset, however, affects all planes
and seed rows simultaneously.
Note For multi-plane graphics using compression modes 3 or 9,
the Seed Row Source command determines which plane of
the seed row to use. The Seed Row Source command is
discussed later in this chapter.
The seed row is updated by every raster graphic transfer,
regardless of the compression method. This allows the delta
compression method to be mixed with other methods to
achieve better compression performance.
Repeating a Row
?* b 0 W
When using the delta compression method, it is possible to
repeat or copy the previous raster row using the Raster
Data Transfer command. This is accomplished by setting
the Raster Data Transfer command value field to zero.
Printing A Zeroed Row (Setting the Seed Row to Zero)
?* b 1 Y
It is possible to print a row of all zeros using the Raster
Y-Offset command. Sending a Raster Y Offset command
with a value field of 1 sets the seed row to zero and prints
the zeroed row. Note that the next delta row is applied to a
zeroed seed row.
6-28 Raster Graphics6-28 Raster Graphics