ijpds formats.book - Kodak

Data Station RIPs
Chapter 1. Overview
Data Station RIPs
The data station's RIP uses input character data and fonts from the IJPDS
job file to build a bitmap in a page buffer that represents the image to be
printed. Each bit in a page buffer represents a dot in the image to be
printed. Each bitmap represents one page of the document to be printed.
Some printing systems contain more than one RIP. In a multi-RIP system,
information in an IJPDS job file must be divided among the RIPs used for
the job using a RIP record.
Each RIP can control from one to four printheads, depending on the data
station, print station, and the width of the printhead being used.
Multiple printheads can be stitched so that the image appears to have
been printed by one printhead. Stitching printheads can greatly increase
the maximum contiguous width of the image to be printed. If stitched
printheads are controlled by separate RIPs, the RIPs are also said to be
stitched.
In the IJPDS job file, the physical RIPs are numbered consecutively
starting with 0. Logical RIP numbers are required when two physical RIPs
are stitched. For example, in Figure 1.3, because RIPs 1 and 2 in data
station 1 are stitched, RIP 0 is used as the logical RIP number for the two
stitched RIPs.
The system controller in Figure 1.3 interprets the RIP numbers in the
IJPDS job file and directs the data to the appropriate RIP in the
appropriate data station.
Figure 1.3 Physical and logical RIPs
IJPDS System
controller
Data
station
1
Data
station
2
Data
station
3
Data
station
4
RIP 1 PH
RIP 2
RIP 1
RIP 2
RIP 1
RIP 2
RIP 1
RIP 2
Physical RIPs
(No stitching)
PH
PH
PH
PH
PH
PH
PH
0
1
2
3
4
5
6
7
Logical RIPs
(DS1, RIPs 1&2
stitched)
Reference Guide 1 - 3
0
1
2
3
4
5
6