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Hi Michael, a good tool is "Contrast Movie" from ArtRepair toolbox. You will find a link to this toolbox on the SPM extensions web page. Volkmar https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=SPM&P=180408 <https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=SPM&P=180408>