https://bugs.freedesktop.org/show_bug.cgi?id=54924

--- Comment #10 from Owen Genat <[email protected]> ---
I agree with comment #9 that transparency (and thus gradients) is not supported
by PDF/A-1. According to Wikipedia (http://en.wikipedia.org/wiki/PDF/A) PDF/A-2
is required:

>Transparent objects and layers (Optional Content Groups) are forbidden 
>in PDF/A-1, but they are supported in PDF/A-2.

>The use of transparency is forbidden in PDF/A-1. The majority of PDF 
>generation tools that allow for PDF/A document compliance, such as the 
>PDF export in OpenOffice.org or PDF export tool in Microsoft Office 2007 
>suites, will also make any transparent images in a given document 
>non-transparent. That restriction was removed in PDF/A-2.

I do not have a copy of ISO 19005-1:2005 or ISO 19005-2:2011 to completely
confirm this but it would seem indicative.

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