I can not configure width/height of the slideshow (module > slideshow-settings > width/height). Whatever value I set here, it has no effect.
Example:
The actual image size is 600px × 349px
I set slideshow width = 400px and height = 250px.
I examine the image properties in the frontend. It says "Scaled to 700px x 407px". See screenshot. I remember that these are the default dimensions previously set in the module configuration.

Joomla: 3.6.5
JoomShopping: 4.15.1
PHP: 7.0.13
MySQL: 5.5.53
Website Url: http://www.terrafisch.ch
JoomShopping: 4.15.1
PHP: 7.0.13
MySQL: 5.5.53
Website Url: http://www.terrafisch.ch