Weird artifact appears in darker backgrounds

[Mars7x]

Describe the bug
If you game uses a darker cover art, then the background will have this weird artifact at the bottom of it.

To Reproduce
Steps to reproduce the behavior:

1. Set the cover art to anything that has black/dark colours at the bottom of it.

Expected behavior
Be consistent with the rest of the background.

Screenshots

[kra-mo]

This is not really an artifact. The current way of blurring the game covers for the background is simply downscaling it to 2x3 pixels and then upscaling it to fit the app. This doesn't really work for backgrounds with a lot of color variation so I will need to find a better algorithm.

[lorhof1]

I tested some things and changing it to 3x4 seems to reduce the issues a bit without impacting other covers.
Before:

After:

Cover image used:

[kra-mo]

I will probably just apply a blur later on as this still looks relatively weird. I have already implemented a way of doing it, I just need to optimize it.