To scale the image plane, do the following:
1) Select the plane (either click on it in the preview window, or select it in 'Scene' panel)
2) Open the 'Modify' panel and look for 'Transform'
3) Enter equal X & Y(?) values under 'Scale' to maintain aspect ratio (axes could vary depending on orientation of image - whichever axis used for thickness should not be scaled up)
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See all the G-Tools Plug-Ins available for iClone here: G-Tools Plug-Ins