As I mentioned, I have little knowledge about graphics.
I believe my issue is that neither xsetroot or Esetroot can handle an emblem.
When I use esetroot -center core_final_64.png the background becomes black.
I am aware that xsri does handle emblem mode however, xsri size with dependencies is too high a cost to be included in core just for some eye candy.
Perhaps I am overlooking an obvious solution with exsiting tools.
I was hoping for a very low impact solution to "brand" tinycore.
Of course, a full screen background, cost 41K, could be used as below: