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Re: read_tif problem
| Re: read_tif problem [message #6989] |
Thu, 05 September 1996 00:00 |
Christian Soeller
Messages: 46
Registered: August 1996
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Member |
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"Dr.Dipl.-Ing. Xiaoming XU" <xu@iic.wifi.at> writes:
>
> IDL can not read tiff files, even the files can be read by other
> commercial programs, like Photoshop, xv etc. We know that there
> are enough different tiff formats, so it is necessary to update
> TIFF_READ or TIFF_DUMP subroutines.
The reference manual clearly states that those routines only support a
subset of the valid tiff formats (especially the image data has to be
uncompressed). It is not simple to make those subroutines support the
full variety of valid tiff formats and compressions. I suggest you get
a copy of the library libtiff and the tools that come with it at
ftp://ftp.sgi.com/graphics/tiff/tiff-v3.4-tar.gz. The tools allow for
full diagnosis of any tiff file (tiffinfo and tiffdump) and also allow
you to change the tiff encoding of a tiff file (tiffcp) to a format that
can be understood by IDL (for example change the compression to none,
etc).
The only straightforward way to make IDL support the full variety of tiff
formats directly is to write an interface to the libtiff functions like
people did for the cdf format. This however is quite a bit of C code that
would have to be written and as far as I know nobody has yet done it.
Hope this helps,
Christian
------------------------------------------------------------ --------
Christian Soeller mailto: csoelle@sghms.ac.uk
St. Georges Hospital Medical School Dept. of Pharmacology
Cranmer Terrace London SW17 0RE
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