HANDCENT - Background image resolution issue

If I try to put a custom, high quality background image for my conversation list in Handent, the app lowers its resolution and looks terrible.

I'm not sure if this is a bug or if the app just doesn't support high quality images for backgrounds. I was hoping you guys could enlighten me on this matter, maybe I'm doing something wrong. Couldn't find any usefull information online.

Thanks in Advance

 

Thank you, all. You've been very helpful؟