Thumbnail-based previews are a useful visual aid to job identification and checking. The ability to define a record length in terms of number of pages is also valuable, as it enables jobs supplied as standard multi-page PDF files to be handled using VDP-specific tools.
An ability to preview individual rasterised pages, sets of records or imposed sheets also enables further visual inspection for errors, though VDP jobs supplied in PDF or PDF/VT can be soft-proofed (albeit in pre-rasterised form) using any PDF viewer.
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