[cairo] pdf analysis

Carl Worth cworth at cworth.org
Mon Feb 23 15:46:39 PST 2009

On Thu, 2009-02-19 at 07:04 -0800, Ken Black wrote:
> I work for a commercial printer and have a client using cairo to create pdf files for print.
> The problem is nothing I try can give an accurate analysis of the file. Specifically, image resolution.
> It seems that images are treated as pattern fills within the pdf. In print, we need resolutions of 240 ppi - 300 ppi, 
> and I need to be able to tell what the resolutions are in order to advise clients if the files that they send are
> acceptable or not.
> If there are any pdf editing/analysis utilities available that will pick apart and see the images as images in files created by Cairo,
> that would be of some help.
> If Cairo strips the image information out in the pdf creation, it would be more helpful if it did not.

Hi Ken,

It seems you're looking for some general PDF analysis tools. Cairo
certainly doesn't have anything like this, but I hope you have good luck
finding something. Perhaps the pdftk project has something that would be
useful to you?

In the meantime, I'm certainly not aware that cairo is doing anything
invalid in its PDF creation, nor "stripping" any image information.

Could you perhaps provide two examples, (one generated with cairo that
isn't behaving for you, and one without cairo that does what you want),
of similar PDF documents so that we could look closely at them to see if
cairo should be doing anything different when it embeds images?



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