On Oct 23, 2005, at 10:56 AM, Christopher Creutzig wrote:

>  according to texshow, \externalfigure accepts scale as an option.   
> For me,
>
> \starttext
> \externalfigure[cow.pdf][scale=0.8]
> \stoptext
>
> results in getting ".8.8.8.8" in front of the image.

The scaling factor is in units of 1000. To get 80% size, use  
[scale=800].

Steve