| Re: read_tiff - simple question [message #14472] |
Tue, 02 March 1999 00:00 |
David Foster
Messages: 341
Registered: January 1996
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Senior Member |
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Harald von der Osten-Woldenburg wrote:
>
> Hi all,
>
> I am trying to read an existing tiff image. Doing this exactly as
> proposed in the online help menue I only get error messages. For
> example:
>
> device, true=24
> image=read_tiff(�zeraqon.tif�, r, g, b)
> tvlct, r, g, b
> tv, image
>
> leads to the error message unknown variable r in tvlct. What is missing?
Look at what you are getting for Image, R, G and B. If Image=0,
then R,G,B are the three separate images. From the OnLine help:
"For TIFF images that are RGB interleaved by image, READ_TIFF returns
the integer value zero, sets the variable defined by the PLANARCONFIG
keyword to 2, and returns three separate images in the variables defined
by the R, G, and B arguments."
If you are using IDL 5.2 then you can use QUERY_TIFF() to see what
is in your tiff file before reading it.
>
> By the way: Does something exist like an archive including all the
> discussion in this newsgroup, so that beginners like me can first have a
> look on this before asking such simple questions in this newsgroup?
There's a FAQ:
http://www.ivsoftware.com/pub/idl_faq.html
Dave
>
> Thanks a lot,
> Harald
>
> --
> Harald von der Osten-Woldenburg
> Geophysical Prospection of Archaeological Sites
> Landesdenkmalamt Baden-Wuerttemberg
> Silberburgstrasse 193
> D-70178 Stuttgart
> http://delos.lf.net/~hvdosten/index.html: Geomagnetics and Geoelectrics
> http://www.region-lb.de/HomeSites/HvdOsten: Ground Penetrating Radar and
> EMI
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
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