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Subject: Re: [Tiff] Floating Point Sample Format
Date: Tue, 22 Mar 2005 00:26:27 +0100
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> I did notice the comment in the Spec that the SMINSAMPLEVALUE
> and SMAXSAMPLEVALUE aren't supposed to be used for scaling.

Part of the rationale might possibly have been:

a) If the spec said these values are supposed to be good for scaling, then
that's one more rule that potentially makes a TIFF file 'invalid', and there's
plenty of those already. On the other hand, if it doesn't say that, the values
aren't any less useful because any reader that has the ability to scan and
derive proper values before any rendering or otherwise necessary scaling, will
do so anyway, for robustness, and any reader that doesn't have that ability
because of single-pass/speed needs, will use those values anyway, because it's
the only indication and thus best possible guess.

b) Scaling may not even be a trivial notion, in some applications. Some data may
find itself with e.g. 2% in the 0-145 range, 96% of the data in the 145-155
range, and 2% of the data in the 155-300 range. What scaling values are
appropriate then? Some data may not make any linieair sense even.


Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

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