No idea about Gimp, sorry.
I suppose Photoshop and Paintshop Pro are available in any well sorted software
store,though Photoshop will be a lot more pricey than Paintshop Pro.
I got mine for 20 Euros on eBay I think. It should be a tad cheaper in stores now,
depending on where you live.
I can write down the steps in Paintshop Pro, no problem, but there might be a
chance all the option are named differently, since I'm using the German version
and would be translating