Re: [NTG-context] error when using externalfigure

26 Nov 2012


      On 11/26/2012 11:00 AM, luigi scarso wrote:
...
On Mon, Nov 26, 2012 at 10:50 AM, Hans Hagen  wrote:
...
On 11/26/2012 10:36 AM, luigi scarso wrote:
...
On Mon, Nov 26, 2012 at 10:20 AM, Pavel Dohnal 
wrote:
...
Hello,
I have a big context source file which contains pictures from different
sources. The problem is, that there are some pictures the context cannot
process. It displays an error message and ends. I run the context from
another script in batchmode. After finishing, the context creates a PDF
file, which contains this problematic picture but the pdf is broken. It
does
not have numbers in the table of contents and it is not arranged by
setup.
Here is a minimal example:
\starttext
\externalfigure[http://cdn-locations-images.tripomatic.com/img-poi1295-5ZTynx-s.jpg][width=26.5mm]
\stoptext
when I save the jpg  as eps from gimp
I see
width = 6096,00
height=4064,00
The first value is off for TeX.
if i print the values from the img object i get
17344.8pt
11563.2pt
so the problem is deep down in the jpg reader ... the image is crippled in
the sense that it has no valid resolution information
something for hartmut to check in the img lib
Hm, I'm not sure. It's an image that could be correct, but TeX cannot manage it.
It has 240x160 pixels and 1ppi, so it's 6,096 meters x 4,06400meters
and 6 meters are too much for TeX (which still has its limits around 5meters)
It's ok to print poster maybe, but then  TeX  is not the right tool.
yes, but the 1,1 resolution prevents us from doing anything useful, i.e. 
we could for instance have something

if xresolution < 72 then xresolution = 72 end

but I'm not sure what the pdf backend will do as then the uses 
resolution for front and backend differ too much

i'll add an overflow check but keep in mind that in that case scaling is 
bases on the limited size

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