[cairo] Cairo PDF embedded images not optimizable in Adobe Acrobat

Adrian Johnson ajohnson at redneon.com
Sat Nov 10 03:33:33 PST 2012

On 10/11/12 21:42, Ben Bradley wrote:
> Hi everyone
> I create designed pages in Inkscape then export to PDF. Then I can
> further process these PDFs in Acrobat, combine multiple pages and
> downsample the images etc.
> I believe Inkscape uses Cairo as the back-end for exporting the PDFs.
> The problem I've found is that the PDF Optimizer in Acrobat is refusing
> to process and downsample the embedded images created by Inkscape/Cairo.
> I posted this thread on the Adobe forums and had the following reply...
> http://forums.adobe.com/message/4836095#4836095
> "The PDF creation software (cairo?) has certainly done something odd. It
> has wrapped up the image in a tiling pattern, then painted the pattern
> just once. PDF shrinking software isn't likely to mess with the contents
> of patterns, they are normally tiny special effect bitmaps not to be
> adjusted... maybe there's an option to change this on creation."
> Has anyone else encountered this?
> Are there any options in Cairo (that aren't exposed by Inkscape) that
> can change the way images are embedded in a PDF?
> Cheers, B

This has been fixed in more recent versions. The version you are using
(1.8.8) is very old.

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