@davidfor: After thinking a bit more about the letterboxing thing, I updated the patch in
#225 to make the letterboxing optional, because it turns out it's not that critical (especially on the H2O, where nickel does an unavoidable extra rescaling pass because of the whole top 11 px behind the bezel thing), the key point was mainly to rescale to the bounding-box of the screen instead of throwing the cover image untouched at nickel.
I also updated the image sets in
#247, which are now complete.
And I also pushed this on
GH.