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Here's another tip - because the netpbm tools can't show you what they are doing it's hard to know what values to use for some of them.
So, I download and use the GIMP for that - it has some of the same filtering options and it's an image viewer/editor similar to photoshop etc. I load one of my frames into the GIMP, play with the filters until I'm happy with the result and then use those settings in the script to process all the frames.
In this case under the "filtering->enhance->NL filter" you find the equivalent of the pnmnlfilt program.
regards, Bird
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