Changing the image to get a different background layer when tracing

[molucca]

The black part of the image extended to the edges, and when traced it became the background layer. I wanted to change the background fill, and have the forground image remain (black). I expanded the image to get a white edge all around. When it traced, the background layer was white. This layer was deleted, and I added a bitmap fill. Since white was the surrounding color, the background was reversed. Rich