eHVD diagnostic mode

This page applies to Harlequin v13.1r0 and later; and to Harlequin Core but not Harlequin MultiRIP

A diagnostic mode is available for HVD and is useful to determine RIP behavior when using HVD. This mode is of no use in production but can be useful when trying to determine why a job behaves in a particular way.

There are several Harlequin-internal values for the /OptimizedPDFCacheID PDF parameter which can be useful in diagnosing HVD behavior with a given job. These values are supported in release builds of the RIP (along with others).

NOTE: These values should not be used for production and are provided for OEM support and development testing purposes only.

With /OptimizedPDFExternal set to true, the following values for /OptimizedPDFCacheID can be used:

(GGDUMB1)	Each raster element identified by the HVD scanner is output exactly once. Used in conjunction with an output back end which does not attempt to reassemble final output pages from these elements such as TIFF or None, this emulates the entire RIP output for a given job assuming that no purges of the back end cache take place (in which case purged elements would be re-output as necessary).
(GGDUMB0)	No raster elements are output. That is, only the HVD scan is performed on the job. Useful if the only item of interest is the RIP monitor output messages about the scan.
(GGVARONLY)	Available with RIPs from July 2013 onwards, this mode outputs only the variable data elements: that is, those with a hit count of exactly 1.
(GGCACHEONLY)	Available with RIPs from July 2013 onwards, this mode outputs only the cached elements, that is, those with a hit count of two or greater.

The following example PostScript language code turns HVD on and selects a diagnostic mode to output each raster element exactly once:

TEXT

                      <<
                        /EnableOptimizedPDFScan true
                        /OptimizedPDFCacheID (GGDUMB1)
                        /OptimizedPDFExternal true
                      >> setpdfparams

For Harlequin Core, see also the supplied HVDDemo example page feature.