hi forum
since an update some weeks ago some of the previews of .jpg .png .pdf- images are irregularily blurred:



Before this issue arose all image previews were clear.
Dolphin previews aren't affected at all, so it seems to be a matter of Plasma folder view widget.
Thats no big deal so i waited for it being fixed later on but til now it wasn't.
Anyway it's irritating to distinguish some images without open them, so preview in the folder view widget lost its full functionality.
Any ideas?

my specifications:
Kernel: 4.15.13-1-ARCH x86_64
Desktop: KDE Plasma 5.12.3 | KDE-Frameworks-Version: 5.44.0
Distro: Arch Linux
Card: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller
OpenGL: renderer: Mesa DRI Intel Ivybridge Desktop
version: 4.2 Mesa 17.3.7 (compat-v: 3.0)