> Quote - Can a bump map such as the one attached. > > (without the watermarking across it and much lareger in size of course) > > be used in place of the "blue" bump map? > >  

:) I see what you're trying to do. Sadly, no, though; the technology behind a normal map(blue maps) and a bump map(grayscale) are different. Only normal maps can go into the Normal channel.

What you CAN do is blend your bump map to the procedural bump shader like this: (see image)
This effectively combines your own bump map with a shader-based bump map. It...may or may not work well. Render up close and with a .11 Minimum Shading Rate, in Firefly render engine, to check.