Oh, I guess you were asking about software program,
Like someone said, you could just set the background color of your chip to the background color used in your layout. That you could probably do with the basic windows paint program.
I use Paint Shop Pro. This is a full featured graphics program, but much cheaper than the more versatile Adobe graphics program.
Most any image editing program should fit the bill to create the background as being transparent (best solution, because then you can use any layout background color or different color for even and odd rounds and the chip will still show up without a square border).