Date: Tue Nov 04 2008 - 16:37:10 PST
Hi Michael,
Thanks for your suggestion - I'm still struggling with this.
Here's the only difference between my input FO files:
$ diff a1.fo b1.fo
5c5
< <fo:list-item-body start-indent="body-start()"><fo:block id="Paragraph_4" font-size="12pt" font-family="Times New Roman, Times, Symbol, serif" font-weight="bold"><fo:inline>Project Name: </fo:inline><fo:inline>Amex</fo:inline></fo:block></fo:list-item-body> </fo:list-item>
---
> <fo:list-item-body start-indent="body-start()"><fo:block id="Paragraph_4" font-size="12pt" font-family="Times New Roman, Times, Symbol, serif" font-weight="bold"><fo:inline>Project Name: Amex</fo:inline></fo:block></fo:list-item-body> </fo:list-item>
Here's the difference in the XEP files (intermediate format):
$ diff a1.xep b1.xep
18,19c18,19
< <xep:text value="oject Name: " x="137894" y="737704" width="64632"/>
< <xep:text value="Amex" x="202526" y="737704" width="29988"/>
---
> <xep:text value="oject Name: " x="137894" y="737704" width="63972"/>
> <xep:text value="Amex" x="201866" y="737704" width="29988"/>
The PS:
173c173
< 202.526 737.704 moveto
---
> 201.866 737.704 moveto
and finally when I convert to an image format (PNG) I'm finding that the word "Amex" is a pixel or two displaced. The PNGs also have different file sizes.
I've attached all of the input and output files.
Any idea what could be causing this difference?
Regards,
Justin.
Michael Sulyaev wrote:
Justin Lipton wrote:
Is there a way to make the rendered PDF ignore these redundant inlines such that the PDF output would be identical in both cases?
We're trying to get PDF unit tests working and this seems to be tripping us up. Stripping them out as part of the FO generation would really complicate our existing XSLT transforms.
Hello Justin,
Generated PDF files may not be binary identical even for one and the same input, at least because they contain datetime fields which obviously vary. File size may also differ, at least because compression methods are not expected to produce outputs of equal size even if inputs are of equal size.
I'd suggest not to waste time doing unit tests on PDF, but rather consider using XEP Intermediate Format output for this purpose. These are text files (XML actually), so diffing is fast, and if you need to see the difference some way, xmldiff may help.
Another approach is to use a rasterizer (e.g. GhostScript) to produce raster images from PDF files and compare them pixel-wise page-by-page. Sounds a bit complicated, but it works, and may be extended to produce visible 'symmetric' difference images for pages that differ, if you need it.
Regards,
Michael Sulyaev
RenderX
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Justin Lipton
justin.lipton@exari.com
Level 7, 10-16 Queen Street, Melbourne 3000 Australia
Tel +61 3 9621 2775 | Fax +61 3 9621 2776
Exari Systems
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- application/zip attachment: comparison.zip