[NTG-context] Resetting image width

[Henning Hraban Ramm]

> Am 06.07.2020 um 21:17 schrieb Wolfgang Schuster <wolfgang.schuster.lists at gmail.com>:
> 
> Henning Hraban Ramm schrieb am 06.07.2020 um 21:03:
>> Hi,
>> for collecting a lot of images into a booklet I set
>> 
>> \setupexternalfigures[width=\textwidth,maxheight=\textheight]
>> 
>> but would like to have some single images defined by height and proportional width, like
>> 
>> \externalfigure[dummy][width=auto,height=.5\textheight]
>> 
>> but height and width only take dimensions.
>> 
>> Can you give me a hint?
> 
> No argument is also valid.
> 
> \externalfigure[dummy][width=,height=.5\textheight]

I thought so and was sure I tried it and got an error, but I recognized I tried "width=," with \clip, and that can’t work, of course.

Sorry for the noise.

Hraban