AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2004.02.06 21:35 "[Tiff] displaying 12 bit tiff image", by Liliana RESENDIZ
2004.02.09 09:00 "Re: [Tiff] displaying 12 bit tiff image", by Andrey Kiselev
2004.02.09 15:06 "Re: [Tiff] displaying 12 bit tiff image", by Bob Friesenhahn
2004.02.10 13:32 "Re: [Tiff] displaying 12 bit tiff image", by Liliana RESENDIZ
2004.02.10 21:41 "Re: [Tiff] displaying 12 bit tiff image", by Chris Cox
2004.02.10 22:30 "Re: [Tiff] displaying 12 bit tiff image", by Liliana RESENDIZ
2004.02.10 23:05 "Re: [Tiff] displaying 12 bit tiff image", by Bob Friesenhahn
2004.02.10 23:37 "Re: [Tiff] displaying 12 bit tiff image", by Frank Warmerdam
2004.02.11 00:21 "Re: [Tiff] displaying 12 bit tiff image", by Bob Friesenhahn

2004.02.11 00:21 "Re: [Tiff] displaying 12 bit tiff image", by Bob Friesenhahn

I would note that remote sensing sensor data is routinely distributed as 16 bits per sample, but with a dynamic range far from the complete 0..65535 range in order to preserve the original sensor results. In cases like this remote sensing applications are expected to scale the data themselves, and there are many approaches to doing that.

My point is that while a "simple picture" that is stored as 16bit might need to be pre-scaled in the TIFF file in the range 0-65535, there are respectible reasons to deliver other kinds of "scientfic data" such that this is not done. Some kinds of applications should be prepared for this to happen.

Is there a way to tell what scaling should be supplied in order to view the unscaled data? Perhaps using black and white levels?

Bob
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Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen