Using one's own images for cursors

[Peter Rootham-Smith]

I'm trying to use images produced in Photoshop as cursors in RR.  I saw 
a comment that after importing the image one had to touch it with a 
brush or something like that to get RR to convert it into an internal 
format.

Is there any way of getting RR to do this conversion programmatically?  
The manual way isn't so practical for me.