Attached Link: http://www.silverblades-suitcase.com/artofadreamer/tutorials/1/1a.htm

Ok, Bumps can be put in ANY of the four channels by clicking the button in them, bump can be set to negative or positive numbers, in or out, on the objects surface. In this pic from my tutorial, I am setting the DIFFUSE, AMBIENT and BUMP into channel one because the bump map is a greyscale taken from the colour image I am using for the colour (diffuse + ambient).  You dont need to do that though if the bump map is going to be taken from another source or is radically different. I could use a grid bump map and put the button into channel B. Then perhaps make transparency map (works similar to bump, shades of white to black regulate amount of transparency) and put that into channel C. To convert images ot grey scale you should really use a 2d image editor so you can get it precise or alter it to suit, like Paint shop pro or Photoshop. bryce can do simple greyscale images from your pics, see this pic from my tutorial:  Hope that helps) Link to my tutorial attached

"I'd rather be a Fool who believes in Dragons, Than a King who believes in Nothing!" www.silverblades-suitcase.com
Free tutorials, Vue & Bryce materials, Bryce Skies, models, D&D items, stories.
Tutorials on Poser imports to Vue/Bryce, Postwork, Vue rendering/lighting, etc etc!