Randall Hopper:
 |If this is an image coming in via ReadImage, change the colortype parameter
 |to float.  If not, then a Mark("colors")->Compute("float(a)")->Unmark()
 |should do the trick.

Sorry, you probably need:

    Mark("colors")->Compute("float(a)/255.0")->Unmark()

Randy

-- 
Randall Hopper (mailto:[EMAIL PROTECTED])
Lockheed Martin Operation Support
EPA Scientific Visualization Center
US EPA N127-01; RTP, NC 27711

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