Problem with Alpha details in Zbrush

[system]

I’m making a weapon at the moment, and doing details in Zbrush. I’m having some problems with using Alpha’s for details.

Here is the alpha map I made in Photoshop:

And here is the result. You can see I’m getting all this noise wherever I didn’t use either full black or full white. I want it to push out at different lengths. Does anyone know what causes this? Zbrush alphas don’t have to be all white or black to work properly do they?

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[DragoCG]

No, they can definitely be shades of grey. What resolution is this alpha at? If you made it too high a rez it might be putting in noise while trying to process all of the pixel data. Try scaling it to 512 X 512 and see if that helps.