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Re: LZW in IDL [message #39722 is a reply to message #39721]

Wed, 09 June 2004 16:52

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Jonathan Joseph wrote:
>
> Regardless of whether I get our licensing working correctly, I would
> like to be able to write the code so that it uses LZW if availalbe and
> either no compression or packbits otherwise. Is there any way to query
> whether the write_tiff command with compress=1 will work before calling
> it? Currently, if LZW licensing is not available, the program will halt
> at the write_tiff call (despite something I read on an RSI web page
> which claimed that it would default to packbits).

When I first read this thread, I thought "Why not just use Zip
compression?" It's as effective, compression-wise, as LZW, and widely
supported. But not supported by IDL apparently, at least not according
to the documentation. This is a shame. Time for a feature request?

You can always post-process the images with ImageMagick, which does
support Zip compression.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: LZW in IDL By: Haje Korth on Thu, 10 June 2004 06:04
		Re: LZW in IDL By: Haje Korth on Thu, 10 June 2004 06:02
		Re: LZW in IDL By: Mark Hadfield on Wed, 09 June 2004 23:17
		Re: LZW in IDL By: andrew.cool on Wed, 09 June 2004 21:52
		Re: LZW in IDL By: Mark Hadfield on Wed, 09 June 2004 16:52
		Re: LZW in IDL By: David Fanning on Wed, 09 June 2004 13:11
		Re: LZW in IDL By: Jonathan Joseph on Wed, 09 June 2004 13:01
		Re: LZW in IDL By: Haje Korth on Wed, 09 June 2004 11:15

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