Rather than rewriting the PDF to version 1.3 (stand alone), or 1.6 (Acrobat). It would be nice if the same PDF version was retained in the newly imposed PDF file. This would be especially useful when the original PDF contains transparency. Also helpful would be to retain the same PDF object structure. This would benefit those in the variable data printing world who use the PDF/VT format to optimize their rip caching when printing.
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