So, this is pretty straightforward if you look at the image:
I have a high res 1920x1080 image. I cropped it to 1920x1080, and when I set it as wallpaper, it gets very low in quality. My display resolution is 1920x1080, so no stretching is involved.
I tried to save image as PNG and BMP and set it as background to no avail. This only happened in this specific image, others don't distort the quality so much.
What is going on? How do I change this?