I'm not experienced with creating spot colour files in Photoshop. So here's my question....I have a logo tif file a client sent as RGB that will be placed in Quark for business card setup. It looks to be a 3 colour image. I would like to set it up as a 2 colour file with a portion of the image as a screen (ie 10 %) of one of the spot colours. Can this be done in Photoshop, and if so, how?