Create object
Save as .png (automatic) no background
Select object with rectangle
Resize rectangular section making selection smaller.
Crop to selection
Convert to RGB
With PFS 8.0 this procedure resulted in having a rectangular colored square behind the object being processed, in this instance purple.

Post Script: the individual object makes a nice icon.
The image in question is the following:

I managed to circumvent the problem by adding a background to my png, merging the object to the back ground and then making the rectangle selection, resizing it to the desired image size. I was in the process of creating a nozzle, and when I had my five images I assembled them, converted the image to RGBA, and removed the white background resulting with the following nozzle:
