2007.01.17 16:03 "RE: [Tiff] Elevation Data", by Ed Grissom

But.... I don't see any disclaimer on SMin/Smax (Min/Max, sure, but not SMin/SMax)

My copy of the spec says:

++++++++++++++++++++++++++++++++++++++++++

SMinSampleValue

Tag = 340 (154.H)
Type = the field type that best matches the sample data
N = SamplesPerPixel

This field specifies the minimum sample value. Note that a value should be given

for each data sample. That is, if the image has 3 SamplesPerPixel, 3 values must

be specified.

The default for SMinSampleValue and SMaxSampleValue is the full range of the

data type.

SMaxSampleValue

Tag = 341 (155.H)
Type = the field type that best matches the sample data
N = SamplesPerPixel

This new field specifies the maximum sample value.

++++++++++++++++++++++++++++++++++++++++++

And then the comments say:

++++++++++++++++++++++++++++++++++++++++++

Comments

The SampleFormat field allows more general imaging (such as image processing)

applications to employ TIFF as a valid file format.

SMinSampleValue and SMaxSampleValue become more meaningful when image data is typed. The presence of these fields makes it possible for readers to

assume that data samples are bound to the range [SMinSampleValue, SMaxSampleValue] without scanning the image data.

++++++++++++++++++++++++++++++++++++++++++

--
ed grissom
ed.grissom@intergraph.com

-----Original Message-----
From: Joris [mailto:joris.at.lebbeke@skynet.be]
Sent: Wednesday, January 17, 2007 9:55 AM
To: Grissom, Ed; Bob Friesenhahn; Craig Bruce
Cc: TIFF mailing list
Subject: Re: [Tiff] Elevation Data