POSTSCRIPT

Considerations

The scan order of an image relative to the content of the image is not important. It is important that the scan order of the image in the desired orientation is relative to the scan order of the page.

There are circumstances when a transformation cannot be avoided by any ordering of image data (such as when the image sides are not parallel to the sides of the paper, or when the image is skewed), but for many cases a rotation can be avoided by ensuring that the data in the image is in the correct order.

Ensuring optimum image data order is complicated by the fact that the rotations are not tied to the use of the rotate operator in a PostScript program, or to implied rotations in the image-to-user space transformation. The transformations specified in PostScript are part of a specification of the desired position of an image in terms of the default user coordinate system.

DocuPrint NPS only performs an image rotation when one is required. Rotations of multiples of 90 degrees are optimized so that the impact is not too great.

Because the data is already aligned with the printing orientation, DocuPrint NPS does not perform any rotation of the image. In the default user coordinate system, a rotate operation is required.

Without the rotate operation, the PostScript specifies that the image be placed on the page with its left edge (fast scan dimension) parallel to the short edge of the paper. A 90 degree counterclockwise rotation of the coordinate system is needed to correctly specify the image orientation on the page.

It may be possible to arrange an appropriate order for the data by correctly arranging the original when a scan is performed. It is assumed that scanners produce data from a portrait scan in left-to- right (fast scan), top-to-bottom (slow scan) order.

By rotating the original 90 degrees clockwise, you can obtain data from the scanner with the fast scan direction bottom-to-top (relative to the original), and the slow scan direction left-to-right, matching the page scan directions for the correct output orientation. Alternatively, you can have the data reordered by a program before the PostScript master is created.

After determining that a certain scan orientation produces data in the optimum order for printing, you can scan an image and import it into an emitter. Some rotation may be necessary to place the image correctly.

If the emitter performs a rotation by manipulating the data, then the resulting PostScript master may have the data in the incorrect order. It is also possible that the emitter may not alter the data and change the transformations specified in PostScript so that the initial ordering is preserved.

Summary

To minimize imaging time, make sure that no data transformations need to be performed at the printer. Order the image data so that the fast and slow scan directions match the output fast and slow scan directions when the image is in the correct orientation on the page. With the image data correctly ordered, arrange the PostScript transformations so that they specify the position and orientation of

XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Xerox 721P87491 manual Considerations, Summary
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721P87491 specifications

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