Border around roughness map

Hi, Thanks for the reply, I made a new image 2048 x 2048 in gimp background black and made white text twice the size, same thing.

One thing I did notice while I was looking at the following post is that if I feed the map into a Math node and multiply by .4 and under it goes away.

EDIT: I just reread your post and I can’t understand how to make a clean image without interpolation or maybe the question is, how big should I make it?