How can I tell ConTeXt to automatically rotate images to fit their dimensions most accurately?

I have high resolution images that would be much more effectively executed in landscape format. Is there a way to tell ConTeXt to automatically place images in landscape format to suit their dimensions when fitting them to a page?

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Are you talking about inline figures or about floating figures? –  Aditya Mar 26 '12 at 16:10
Floating, I believe. I'm using the "externalfigure" command and they are large enough to not reflow. \placefigure[] [fig:i2] {The SDFN Diagram for Interview 2} {\externalfigure[Chapter4/graphs/i2_rot.png][factor=fit,frame=on]} –  Brian Ballsun-Stanton Mar 26 '12 at 19:08

I don't know of any automatic method, but what you can do is to define a custom style for the images that have to be rotated and use it for big images. Example:

\defineexternalfigure [BigImage] [orientation=90]

\starttext

\externalfigure [cow]
\externalfigure [cow] [BigImage]

\stoptext


Whenever you want to include a big image that should be rotated, you add another pair of brackets with the identifier (here [rot] for rotated).

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I would change the name of the identifier to rotated or landscape. Using abbreviated names like rot does not fit in with ConTeXt naming scheme. –  Aditya Apr 11 '12 at 19:00
@Aditya The idea was to emphasize that it's an arbitrary identifier and not a keyword. I changed it to BigImage; that's what describes the nature of the image, rotated would describe how it is displayed. –  Marco Apr 11 '12 at 19:56