Jeff, Thanks for your reply. I've come up with a solution that has worked for me. I am working with 8 bit images which are scans of paper maps. I noticed that in the save dialog box for rectifying images there is the "No data as:" field. In version 10 this is automatically blank, but in 10.1 it is automatically populated with the value 256 (for my 8 bit image). This promotes new saved raster to 16 bit, which I believe may be what prevented it from displaying in other software. To correct this I simply deleted the "NoData as" field and left it blank as it was in 10. I do this each time I save. So far I've been able to see the rectified images in Google Earth and Photoshop. I'm guessing the change in default treatment of No data values in 10.1 is associated with the additional No Data options in environment settings.
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