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Re: IDL 5.5 jpeg and tiff [message #27532 is a reply to message #27528]

Sun, 28 October 2001 12:26

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

From: <wmc@bas.ac.uk>
> Why don't you just replace the "write_gif" routine with one that uses
> write_png, then the ImageMagick routine "convert" to convert the png's
> into gifs? You can have the code I use to do this if you like...

Good idea, but for the last year or two ImageMagick has not supported LZW
compression out of the box. This is from README.txt:

o --enable-lzw: Unisys reportedly claims a patent on the algorithm
supporting LZW compression (e.g. used by GIF and TIFF). To avoid
possibly infringing on this patent, support for LZW is disabled
by default. With LZW support, GIF files written by ImageMagick
will be much larger than expected.

So if you download the binaries, you will *not* get LZW compression. You can
get it by building from source, or by using an old version, but I guess you
are risking a phone call from Steve Smith's screaming lawyer.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield
National Institute for Water and Atmospheric Research

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[Message index]

		Re: IDL 5.5 jpeg and tiff By: newt on Sun, 28 October 2001 14:28
		Re: IDL 5.5 jpeg and tiff By: Mark Hadfield on Sun, 28 October 2001 12:26
		Re: IDL 5.5 jpeg and tiff By: wmconnolley on Sun, 28 October 2001 09:14
		Re: IDL 5.5 jpeg and tiff By: Joseph B. Gurman on Sat, 27 October 2001 21:39
		Re: IDL 5.5 jpeg and tiff By: A. D. & J.C. Cool on Sat, 27 October 2001 20:18
		Re: IDL 5.5 jpeg and tiff By: nobody@nowhere.com (S on Fri, 26 October 2001 12:20
		Re: IDL 5.5 jpeg and tiff By: Mark Hadfield on Thu, 25 October 2001 21:05
		Re: IDL 5.5 jpeg and tiff By: wmconnolley on Mon, 29 October 2001 08:08

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