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Mark Jenkinson wrote: > So I recommend checking the funused fields (you can look at the > output of avwhd) and if they are zeros then you can proceed without > problem. Actually I'm afraid it gets worse... I have Analyze images (I think produced from SPM99) that include a scale-factor which doesn't show up in these fields... SPM5 shows the images as having intensity from 0 to 1, while avwhd shows all (unused1, funused1, funused2, funused3) as zero, with the glmax as 32767 -- so perhaps you need to scale by this in some situations? Try asking on the SPM list if that is where your images originate. Best of luck, Ged.