I am unsure about the "canonical" way to scale images to the desired size.
my current understanding is, that `scale=' should do what I want in a way
portable across `context' incarnations. so currently I use commands like
\externalfigure[image.png][scale=750]
to adjust the image size to my taste.
my problem: the same document looks completely different regarding image
size in the produced pdf with standalone installations on osx64 and
linux-64. actually, on oxx64 I have to use something like `scale=1500'
where on linux-64 `scale=750' seemingly does about the same.
questions:
* what am I missing? why does the same document compile differently? I can
only guess that `context' (or luatex?) has two different opinions of dpi
resolution on the two machines when producing the pdf? where can I
control/check this?
* if `scale=' is not the way to achieve invariant and unambiguous size of
images embedded in the document, what is? `width=XXX cm'? i.e.: how is
this supposed to be done correctly(TM)?
thx/joerg
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