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January 2004
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2004.01.23 19:15 "Re: How to convert MINISBLACK to PHOTOMETRIC_RGB", by Bob Friesenhahn
On Fri, 23 Jan 2004, Frank Warmerdam wrote: > > 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 You are biased by your remote sensing background. A sample is just a sample. A sample is one unit of data. Multiple samples can be used to support image rows, strips, tiles, or planes. The notion of "channels" is a way of thinking about raster images as being comprised of one or more layered "planes". So the term "channel" is similar to a "plane". Some interpretation of the available (or selected) channels is used to compose the image that a viewer actually sees. For RGB hardware, the red channel occupies the red channel of the hardware, etc. So, a channel is a collection of all of the samples which have the same meaning. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen