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hi, thank you for the replies. >I'm not sure why it doesn't work for you - are you sure you don't >have fslview aliased to a longer command, indeed, this was the problem. i had fslview aliased. i changed it to: alias fslview 'fslview \!* &' >> (2) Are the lookup tables listed in the 'Overlay Information >> Dialog' stored as external files? > >Not all of them - some are in $FSLDIR/etc/luts this explains why i could not find them. in the end, it did not matter. >> (3) I see that fslview uses the lut name stored in 'aux_file' in an >> AVW .hdr field. Might fslview look at >> another header field for transparency? > >It could, but that would need a change to the NIFTI definition, and >I'm not sure it makes sense to decide in general what an image's >transparency should be - it would be more generally useful I think to >be able to set transparency on the command line - and that is on our >TODO list. which is on my Wish List. :) well, my real wish is to be able to specify lut and transparency in 'overlay' for n-many image volumes. thanks again, - bettyann