[IPOL discuss] Ipol articles + other errors

[Nicolas Limare]

Hi,

> I would add one moderation to that assessment: unless I'm mistaken, some
> pdf that you tested are not representative of what we expect in
> IPOL.

Oh, yes. I took a few PDFs I had on my disk and tortured the Flash and
PDFjs readers, to get an idea of their robustness. Only a few of these
articles look like realistic IPOL articles, and none was produced by
myself from the current class. And as long as articles are "somehow"
readable online and available with high-quality downloads, I think
the issues can be worked around.

The only problem that may be serious is the problems encoutered when
rendering some graphics, which could be happen in our PDFs.

My impression is that the javascript reader is too experimental and
fragile now to be used on the public pages of a journal. This would
leave us with:
* PDF plugin and Flash fallback
* full-text, as good as possible, but probably not very good
  it will require a big WARNING! see also this article abourt the
  conversion: http://kwarc.info/kohlhase/papers/mcs10.pdf
* downloadable PDFs

> http://dev.ipol.im/~simonl/php/pdfInHtml/pdfjs/viewer.html?file=../upload/Carbonell_-_On_Man-Computer_Interaction_:_A_Model_and_Some_Related_Issues.pdf
> -> PDFjs: uses lots of computing resources
> -> Flash: doesn't render anything
> """
> This file is not really relevant, since I hope we are not going to
> accept scanned pdfs :)

Sure. But we may have problem when an article has a lot of large
images, which may pose similar problems.

> """
> http://dev.ipol.im/~simonl/php/pdfInHtml/FlexPaper/index.php?doc=../upload/docs/stronglinks-ssdbm2010.swf
> -> Flash & PDFjs: very bad math rendering page 4 (bottom)
> -> Flash: abnormal gray marks on page 3 when the illustration at the
>   top of the page is out of the window
> -> PDFjs: abnormal color in the illustration at the top of the page 3
> """
> I guess the maths rendering problem is related to an uncommon way of
> generating the math (not latex?).

$ pdfinfo stronglinks-ssdbm2010.pdf 
Creator:        TeX
Producer:       pdfTeX-1.40.9
CreationDate:   Mon May 10 23:18:12 2010
ModDate:        Mon May 10 23:18:12 2010
Tagged:         no
Pages:          18
Encrypted:      no
Page size:      612 x 792 pts (letter)
File size:      1721022 bytes
Optimized:      no
PDF version:    1.4

-> it's pdfTeX, with embedded fonts.

> """
> http://dev.ipol.im/~simonl/php/pdfInHtml/pdfjs/viewer.html?file=../upload/IPOL.pdf
> -> PDFjs: the logo is not resterized with a low resolution, it is
>   vectorial in the PDF file
> http://dev.ipol.im/~simonl/php/pdfInHtml/FlexPaper/index.php?doc=../upload/docs/IPOL.swf
> -> Flash: dirty jpeg rendering of the logo (JPEG Gibbs artifacts at
>   500% zoom)
> """
> This would be a bigger issue. Do we really need a vectorial logo in the
> articles? At least in the web rendering version, I would say that a bitmap
> version should be sufficient. And we could still use the vectorial one in
> the distributed pdf.

Yes. But this probably means that some other vector graphics will be
rasterized by the Flash conversion, and we loose the possibility of
using the zoom to explore details. Not a terrible problem, but not as
good as native PDF rendering.

-- 
Nicolas LIMARE - CMLA - ENS Cachan    http://www.cmla.ens-cachan.fr/~limare/
IPOL - image processing on line                          http://www.ipol.im/
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