So I thing the case should work as expected. Could you send complete-and-minimal example?
\starttext \startMPcode externalfigure "hacker.jpg" scaled 300; \stopMPcode \stoptext
It seems to me the behaviour is perhaps not intuitive but correct. I try to explain:
Imagine externalfigure without scaling:
externalfigure "hacker.jpg";
What we will obtain? One can imagine the image in its natural size. That is not the case. We obtain the image of the size 1pt x 1pt. I thing there are two reasons for that:
1) Analogy. Imagine this example:
draw origin--(1,0)--(1,1)--(0,1)--cycle;
it is exactly the same as
draw origin--(1pt,0)--(1pt,1pt)--(0,1pt)--cycle;
and it is abbreviated to
draw unitsquare;
and im most cases it is used with scaling
draw unitsquare xscaled 2cm yscaled 1cm;
since
scaled X = xscaled X yscaled X
then
unitsquare scaled 2cm
is still square.
If you do not specify the unit, the pt is deduced.
So there is an analogy:
"unitfigure" 1pt x 1pt = externalfigure "file"2) Technician. The scaling dimensions are calculated by TeX engine. It is done by tricks in pt units, so image 1pt x 1pt simplifies the calculations.
If you want to use a bitmap in ConTeXt MP environment in its natural size, I suggest to precalculate (according to Hans macro \MPfigure) its dimmensions:
% ------------------------------------
\def\getMPfiguresize#1{%
\getfiguredimensionsonly[#1]%
\freezedimenmacro\naturalfigurewidth
\freezedimenmacro\naturalfigureheight
}
\def\naturalMPfigure#1{%
externalfigure "#1"
xscaled \naturalfigurewidth\space
yscaled \naturalfigureheight\space
}
\starttext
\getMPfiguresize{hacker.jpg}
\startMPcode
\naturalMPfigure{hacker.jpg} ; % space in front of ; is important!!
\stopMPcode
\startMPcode
\naturalMPfigure{hacker.jpg} scaled 2 slanted .3;
\stopMPcode
\stoptext
%-------------------------Vit Zyka
-- Vít Zýka --- http://typokvitek.com Automatic document typesetting Automaticka sazba dokumentu -- --
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