XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 57
Figure 9.13
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XJ128/200 rear view. Resolution according to CCITT recommendation T.4 for group 3
facsimile units
9.2.8.2 Extraction of image data
Imaging software usually has an orthogonal bitmap as the output. With a printhead orthogonal to the
print direction the extraction of image data is a simple as feeding the print head with vertical "slices"
of the bitmap. Image extraction for a slanted printhead is performed by feeding slanted "slices" of the
bitmap.
These slanted "slices" can be visualised by imagining the line with solid black dots in figures 9.12
and 9.13, scanning across the bitmap just as the substrate passes beneath the printhead. For every
printhead position over the substrate, the image data masked out by the black dots is to be sent to
the printhead. Figures 9.14 and 9.15 show the top 29 nozzles of the printhead positioned over a
section of the bitmap to be printed.