Hello again, Im using this support forum diligently because I noticed how helpful people are here 
So, my problems:
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When I start up UM from Grub2 menu, there comes a grey “window” onto the center of my screen. I assume that it is the default plymouth boot splash. But I have checked it, and in my understanding it should have text and some loading animation, but it does not. Its just… grey. It looks bad on my custom Grub2 theme. It was so even when grub2 menu was default.
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Also, the shut down splash is weird. I have a custom image there. The image should be pretty good quality, just the resolution is the same than in original UM logo, but the compression level is not very high and it looks good in all graphic applications.
The weirdness is, that around it there are some random pixels. The picture itself is round, but around it in kind of random places there are white “dots”, not much but enough to make it look bad.
Difficult to give you a picture of it right now, but I tried to explain.
Like it would have taken some pixels of that pic and thrown them around the pic, without breaking the pic itself.
The pics background is transparent, and the white pixels come to that are where the transparent background is, about. I zoomed in in gimp, but saw only transparent area, no white pixels within it.