You can't scale an image in the picture control in LabVIEW 6.0. NI did add a "Zoom Factor" property to the picture control in LabVIEW 7.0, so if you have 7.0 or 7.1 available, switch to that add it will be easy.
Otherwise, if you're on a Windows platform, you may be able to do something using ActiveX and the browser control, or another MS Office application. Some of them can work with images. NI has an example of how to use the MS browser and ActiveX in LabVIEW.
LabVIEW example browser.
I think the IMAQ toolkit also has scaling options for images also. Though I've never tried it, you might look into it.
Let me know what you have available and we'll see if we can't work something out.

Ed Dickens - Certified LabVIEW Architect
Lockheed Martin Space
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.