ext_36165 ([identity profile] mzdt.livejournal.com) wrote in [personal profile] anuran 2005-09-12 11:11 pm (UTC)

you may be doing this already...

... and you don't have much to work on, but if I wanted to bring out clouds against a blue sky on bw film I'd use a red fliter on the lens...

... so have you tried just taken the red channel from the colour picture, and using that to make the bw image?

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