Okay. So there's an issue with interpreting "RGBA(n,n,n,n)"
I wonder why it works here and not with you?
I can say additionally that png obtained from "convert" is not understandable by Clover. We MUST optimize it by pngquant
Then the result
Screen Shot 2015-06-03 at 17.31.48.png 1015.6KB 1 downloads
Using this script I have to say that Clover interprets first pixel as transparent so doesn't matter what is background color.
Seems "grey" will be enough.
But fill color should be tunable...