nothing "pro" about it. doesnt even retain exif data
it is overall a very bare bones application.
you can select areas to retain colour and leave the rest of the image in grayscale, but that is it.
there is no easy way to reimport the version back into iphoto. you cannot affect the saturation, contrast, exposure, or anything in splash, so you need to do that in iphoto (or your favourite editor) and then export into isplash, sometimes you need to go back and forth a few times to get the image just liek you want it.
but the worst of it is that isplash saves a version of your photo minus exif data. bummer.
agila about iSplash Color Photo Editor