I am currently trying to determine if multiple image importers all
using the same image file or one importer split up makes any
difference. As far as I can tell the subsequent image importers are
not loading the image so it isn't affecting the file size of the
composition. Alternatively, I could use an image downloaded patch
to grab the image where needed, storing it outside the comp.
Does anybody know if multiple image importers all referencing the
same image store multiple copies in the composition?
I can't answer your question, but I find the following interesting:
1) Import an image in a composition and save it
2) Duplicate the Image Importer patch in the previous composition and
save it
The file size for the compositions are almost the same, as Steven
pointed out. Therefore, I'd say the image is referenced and only
stored once.
3) Open both .qtz files in Property List Editor. You will see that all
the information is there for both Image Importers, including the data
for the image.
4) Save both files as XML files and compare their sizes: the XML file
of the second composition is bigger than the XML file for the first one.
I don't really understand this, I always thought .qtz files are simply
binary XML files. Is it possible to reference other tags in those? Why
is the data for the image present only once in .qtz files but twice
in .xml files?
Anyways, Quartz Composer seems to be smart enough to do the following:
5) Change the file extension of the composition containing two Image
Importers saved as an XML file from step 4 from .xml to .qtz. This
gives you a composition in plain text XML with the image data twice in
it (i.e. it's the bigger file)
6) Open the composition in Quartz Composer again and save it to a
different file. The resulting file has the size of the smaller one
again.
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