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From: Frank Warmerdam <warmerdam@pobox.com>
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To: Joris <joris.at.lebbeke@skynet.be>
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Subject: Re: [Tiff] How to convert MINISBLACK to PHOTOMETRIC_RGB
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Date: Fri, 23 Jan 2004 12:38:06 -0500
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Joris wrote:
>>samples/bands/channels.
> 
> 
> I'm confused. It's only now I (think I) understand the word 'band' is used
> as another word for 'channel' and 'sample' throughout this discussion. Is
> that correct? It's confusing, since it to me that word seems to be more like
> 'strip' then like 'channel' or 'sample'.

Joris,

In the remote sensing community we used (still?) sometimes call what is a
"sample" in TIFF a channel.  Apparently it originally had something to do
with comunications channels to the satellite or something.  Band is another
common name in the general imaging community I think.  I suspect that it
derives from a band representing a chunk of wavelength or bandwidth.  I agree
that band sounds alot like strip, and sometimes when I stop and think about it,
it amazes me the amount of terminology and jargon involved in something as
simple as raster files. BTW, in JPEG2000 they call a "sample" a "component".

"sample" == "band" == "channel" == "component" == ?

Best regards,

-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent


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