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From: Kemp Watson <kemp@objectivepathology.com>
Date: Fri, 11 May 2018 07:15:44 -0400
Message-ID: <CACp925QKTAD49WK0GW7uODxbHUeCZu=uOV==QNuKVLb0k0O0aw@mail.gmail.com>
To: Even Rouault <even.rouault@spatialys.com>
Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] LZ4 compression
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Even, might I ask where the compression tag is registered?

Kemp

On Fri, May 11, 2018 at 5:14 AM, Even Rouault <even.rouault@spatialys.com>
wrote:

> On vendredi 11 mai 2018 01:43:33 CEST fx HAYAKAWA MICHIO wrote:
>
> > Hi,
>
> >
>
> > 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?
>
>
>
> Michio,
>
>
>
> I've recently added support for a ZStd codec in libtiff master. This is
> significanly faster than DEFLATE, although not as LZ4, but the ratio
> compression_rate/decompression_time of ZStd is rather attractive.
>
>
>
> Even
>
>
>
> --
>
> Spatialys - Geospatial professional services
>
> http://www.spatialys.com
>
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/
>

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<div dir=3D"ltr"><div>Even, might I ask where the compression tag is regist=
ered? <br><br></div>Kemp<br></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Fri, May 11, 2018 at 5:14 AM, Even Rouault <span dir=3D=
"ltr">&lt;<a href=3D"mailto:even.rouault@spatialys.com" target=3D"_blank">e=
ven.rouault@spatialys.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><u></u>
<div style=3D"font-family:&#39;Sans Serif&#39;;font-size:9pt;font-weight:40=
0;font-style:normal"><span class=3D"">
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">On vendredi 11 mai 2018 01:43:33 CEST fx HAYAKAWA MICHI=
O wrote:</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; Hi,</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; </p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; I&#39;m new at libtiff mailinglist.</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; If LZ4 compression was discussed before, sorry for=
 bothering you guys. But,</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; I couldn&#39;t find LZ4 discussion in mailing list=
 archive.</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; </p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; I&#39;m wondering there is any plan to officially =
support LZ4 compression for</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; contone images. LZ4 is getting popular in file sys=
tem. It improves decoding</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; performance significantly. That means if TIFF is c=
ompressed in LZ4, any</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; TIFF viewer can decode the images significantly fa=
ster than flate or LZW</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; compression. Downside is LZ4 is little bit worse i=
n compression ratio. How</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">&gt; does it sound?</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">=C2=A0</p>
</span><p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-=
right:0px;text-indent:0px">Michio,</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">=C2=A0</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">I&#39;ve recently added support for a ZStd codec in lib=
tiff master. This is significanly faster than DEFLATE, although not as LZ4,=
 but the ratio compression_rate/<wbr>decompression_time of ZStd is rather a=
ttractive.</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">=C2=A0</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">Even</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">=C2=A0</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">-- </p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px">Spatialys - Geospatial professional services</p>
<p style=3D"margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0=
px;text-indent:0px"><a href=3D"http://www.spatialys.com" target=3D"_blank">=
http://www.spatialys.com</a></p></div><br>______________________________<wb=
r>_________________<br>
Tiff mailing list: <a href=3D"mailto:Tiff@lists.maptools.org">Tiff@lists.ma=
ptools.org</a><br>
<a href=3D"http://lists.maptools.org/mailman/listinfo/tiff" rel=3D"noreferr=
er" target=3D"_blank">http://lists.maptools.org/<wbr>mailman/listinfo/tiff<=
/a><br>
<a href=3D"http://www.remotesensing.org/libtiff/" rel=3D"noreferrer" target=
=3D"_blank">http://www.remotesensing.org/<wbr>libtiff/</a><br></blockquote>=
</div><br></div>

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http://lists.maptools.org/mailman/listinfo/tiff
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