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Re: LZW in IDL [message #39733 is a reply to message #39731]

Wed, 09 June 2004 13:01

Jonathan Joseph
Messages: 69
Registered: September 1998

Member

Is there a way to query whether or not you have permission to write an
LZW compressed tiff file?

I just found out that we actually do have the LZW licensing string in
the license.dat file. Unfortunately, It seems as though the number of
allowable LZW licenses is 1, while the number of allowable IDL licenses
is 8 - so if someone else has started IDL before you, they have the one
and only LZW license. I hope this was just a glitch in the creation of
the license.dat file. Another multi-user license we have seems to have
the same number of LZW licenses as IDL licenses.

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).

For example, if I send the code to collaborators, I want it to not crash
if they don't have LZW licensing. Even when the Unysis patents expire,
It will take some IDL maintenamce (at least a new license string, if not
a new version of IDL) to be able to use the functionality again.

Thanks.

-Jonathan

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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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