[Therion] background sketch inserted multiple times

[Marco Corvi]

infact i noticed that if there are N sketches inserted in the scraps, for each one of the sketches
all the N sketched are included in the pdf.

therefore the size of  the pdf grows quadratically, ie, as N*N,
with the number of inserted sketches.

maybe martin may explain why it is so ...
thanks.

marco




________________________________
 From: Michael Wasmund <knollesimage at t-online.de>
To: List for Therion users <therion at speleo.sk> 
Cc: Christopher Ross <chrsross at t-online.de> 
Sent: Sunday, November 4, 2012 1:53 PM
Subject: Re: [Therion] background sketch inserted multiple times
 

 
Hello Bruce,
 
I think we're suffering the same inflated 
PDFs.
I attach a small project which uses 3 very tiny PNGs as 
input,
resulting into a PDF which is at least 3x the size in MB.
With 
large bitmaps, a PDF is produced which some computers cannot handle anymore 
because of size.
We also use Therion version 5.3.10.
 
For the "Fuchslabyrinth" Project, we have an 
additional issue which is at least as painful:
Overlapping sketches (even if 
the inserted PNGs are transparent)
lead to a PDF output, where passages in 
the overlapping area are concealed.
Current workaround is to crop the PNGs 
razorsharp at the passage boundaries,
but that is not always 
possible.
 
See attached mini-project.
 
If you or the Therion developers have a "fix" for 
either issue,
we'd greatly appreciate receiving it!
 
Cheers,
Michael.
----- Original Message ----- 
>From: Bruce 
>To: 'List for Therion users' 
>Sent: Tuesday, October 30, 2012 7:45  PM
>Subject: [Therion] background sketch  inserted multiple times
>
>
>Michael
>I think you just added  a wiki item on Fuchslabyrinth caves where it says Therions bitmap morphing  feature is being used.
>I am intrigued because  in 2008 or 2009 we were starting to use this feature, then we were delayed,  and by the time we got back to experimenting there was a bug in the next  version of Therion whereby the sketches were inserted into the pdf outputs  multiple times, taking inordinate time to compile and making the pdf files  very large, 100’s of megabytes in many cases.  Stacho acknowledged the  bug and I think some change was made in 5.3.9, but it did not fix the problem  for us.
> 
>Described here http://article.gmane.org/gmane.comp.gis.therion/2680/match=sketches
> 
>I have tried again with  a couple of different files using 5.3.10, in one trivial case a 283kB sketch  inserted in a small map produced an 11MB pdf file (the pdf without the sketch  is 300kB).
> 
>So I am wondering how  you are making it workable?
>Either;
>-          something in our custom  metapost or layouts is causing the error for us and you are not experiencing  this bug, or
>-          you are using an old  version of Therion in which this feature was bug free,  or
>-          you are putting up with  very large output files, even for very small portions of your overall  project
>I’m interested in your  comments.
> 
>Bruce
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