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From: Nigel King <king@dircon.co.uk>
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Subject: Re: MetaFun questions
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>>   has the original figure-size scaled 2 and not unitsquare scaled 2
> 
> can you be a bit more explicit

I might be able to help since I had this problem with scaling external
figures in mpost MetaFun.

In ConTeXt \externalfigure[xxx.pdf] brings in a picture at the size of the
picture. Scaling modifies that size.

In mpost MetaFun externalfigure("xxx.jpg") brings in a figure at the size of
unitsquare scaled 2 which then has to be scaled up by other values to get to
a useable picture which involved me in quite a lot of trial and error. I did
not try this with pdf.

-- 
Nigel