John Pye wrote:

This approach (save as PDF from Inkscape) did not give me alpha channel transparency in my PDF.

Inkscape saves the opacity for every structure not for groups of structures as you defined your SVG. You will get the alpha channel when you ungroup your SVG-structures. In a private mail I attached your example file where I did this and the corresponding PDF output. There's unfortunately a bug in Inkscape so that the invisible contur lines of the rectangles in your SVG appear in the PDF-output:

http://sourceforge.net/tracker/index.php?func=detail&aid=1512078&group_id=93438&atid=604306

regards Uwe

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