Clarification and correction to my post above: (thanks MommaBird for pointing this out) - you cannot get transparency in Photo Brush.
You can erase the background of a photo using Photo Brush's selection tools, but... it requires a couple of steps: select what you want to keep, copy to the clipboard the Floater that the selection tool creates, make a new Photo Brush file and paste the Floater... but the resulting new file has white where you might want to have transparency.
That's not a problem when this new file is brought into Real Draw, because you can apply transparency to the white in RD... but the upshot is that it's a multiple-step process.
There are no corresponding set of selection tools in Real Draw, other than the little-known Color Transparency picker in the top toolbar, which is a combined magic wand selection + instant transparency tool.
P.S. MommaBird's excellent point in post #10 is something I never thought of. I don't know why, because Corel PhotoPaint falls over all the time, and that was one of the reasons I went with Photo Brush in the first place!