I've attached a ZIP with a practice PSD file which should be saved with a resolution of 72 dpi and a size of 485 px x 720 px. The sample PNG I made is also in this ZIP.
I will pay $20 per hour for this job and it should take no more than 1 hour. Once I know the example works I will send a collection of 5 PSDs that will have different pallets so I can be assured it always gets the right background color.
14 freelancers are bidding on average $32/hour for this job