K2 - Image Quality Problem

Hello!

I have an problem with an article image "preview".
Inside article the image quality is perfect, but the preview quality is quite bad.

http://poradniaurody.pl/ - this is my webstie. I`m talking about the article "artykuł testowy 2" in mainbody module.
The k2 is importing image from "content" tab and placing it as preview at homepage (why the quality is so bad if inside quality is good)..
Is it an option that k2 place the image from "image tab" and makes it both an "preview image" and "article image" (after clicking into the preview).

I`m not sure i`m talking clearly. I hope u understand me guys.

Greetings from above,
Prixo!

Hi

Please take a loot at thumb settings in this module configuration. It is set to 100px, so it's small. Try also using L image as source in case generic is too small.