I am an old printmaker in my heart of hearts. The sight of an old printing press and the smell of printing ink are intoxicating. I haven't made a traditional relief print in a long time; but I have developed a pretty convincing digital method of working in Photoshop that approximates the look of an image printed from a carved linoleum or wood block.
One of the tricks is to draw the white, not the black. HERE is a little description I wrote about my process sometime ago..