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March 2005
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2005.03.21 21:12 "Re: Floating Point Sample Format", by Chris Cox
At 3:56 PM -0500 3/21/05, Frank Warmerdam wrote: > On Mon, 21 Mar 2005 11:51:16 -0800, Chris Cox wrote: > > Those tags aren't supposed to be used for scaling anyway - they're > > only for information. (see the TIFF spec) > > I did notice the comment in the Spec that the SMINSAMPLEVALUE > and SMAXSAMPLEVALUE aren't supposed to be used for scaling. > Do you have any idea why that comment is there? Yes, because that's what the tag means. It's not a comment, it's a definition. > I have always taken these fields as ok to use for scaling, And we've found that they're not OK (I tried it once as a solution to some badly written files, and had to back it out because of other badly written files). > but with the caveat that they may not be terrible appropriate. But > if we want to avoid a prescanning step it would seem like a good > first guess at scaling values. It's better to scan as you read, or define other metadata for how to present/display the image (because linear scaling usually isn't the best idea). Chris