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From: fx HAYAKAWA MICHIO <michio.hayakawa@fujixerox.co.jp>
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Cc: "tiff@lists.maptools.org" <tiff@lists.maptools.org>
Subject: Re: [Tiff] LZ4 compression
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Hi Bob,

> Have you tested its effectiveness with image data?

Not yet. I think it can be done by comparing flate or LZW compression against LZ4 compression on RAW image files.

Thanks,
Michio

-----Original Message-----
From: Bob Friesenhahn [mailto:bfriesen@simple.dallas.tx.us] 
Sent: Friday, May 11, 2018 9:51 PM
To: fx HAYAKAWA MICHIO <michio.hayakawa@fujixerox.co.jp>
Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] LZ4 compression

On Fri, 11 May 2018, fx HAYAKAWA MICHIO wrote:

> I'm new at libtiff mailinglist.
> If LZ4 compression was discussed before, sorry for bothering you guys. But, I couldn't find LZ4 discussion in mailing list archive.
>
> I'm wondering there is any plan to officially support LZ4 compression for contone images.
> LZ4 is getting popular in file system. It improves decoding performance significantly. That means if TIFF is compressed in LZ4, any TIFF viewer can decode the images significantly faster than flate or LZW compression. Downside is LZ4 is little bit worse in compression ratio.
> How does it sound?

Have you tested its effectiveness with image data?

Development libtiff now supports Facebook's Zstandard (zstd) compression which is pretty fast and does seem to be effective with image data.

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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