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Hello,
Yes it should be possible to do spectral math in IDL and we can give some guidance, but first let me ask a couple of questions: Do you have access to ENVI+IDL (and if so, what version), or just IDL? Also, to confirm, are you wanting to do spectral math or band math? With spectral math, you would extract a spectrum from a given pixel location and subtract your white reference from that spectrum. With band math, you would do some operation on the entire image across all of the bands.
Thanks
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