Problem with IE/Edge - no clear images

Hi, guys.
Our customer uses IE or Edge on his PC and he told us, the images on their website arent sharp (or clear? I have a little translation problem).

Here's the website

On Firefox everything is fine. I have the feeling the News Show Pro module is interpolating the images, but on IE/Edge nothing happens and you have bad looking border if you look on the font of the image.

I dont know how to solve this problem. Here's an image... left side is Firefox and right side Edge... left looks good, but right...

Hi

Image is created from generic image, which I believe can be rather small in most K2 configuration, so please simply switch to use a bigger image like Large or XLarge in NSP Additional K2 configuration.

Hi,

I only want to say, that I changed the image sizes as you said before. I'm not sure if it helped, I'm only happy that it works in all the other browsers... except IE :/

Hi

In this case I think it has to be because of browser performance. As I see on Your screen, text below image is slightly blurry as well. Try disable creating thumbnails in NSP settings and check if this orginal size images will make a difference.